<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2025 Workiva-->
<!--r:3f483bba-d3fe-46dd-aaa9-d483cf845e4c,g:75ff7d88-20c9-462b-ad4f-221a1b580d9c-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://www.paalp.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETS" xlink:type="simple" xlink:href="pagp-20250630.xsd#CONDENSEDCONSOLIDATEDBALANCESHEETS"/>
  <link:calculationLink xlink:role="http://www.paalp.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_a99ad9e2-ae94-4413-a8c6-d9ff0446ad20" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccount_f3453d65-9b60-4646-979f-a7c06a62fdf9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LimitedPartnersCapitalAccount"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_a99ad9e2-ae94-4413-a8c6-d9ff0446ad20" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccount_f3453d65-9b60-4646-979f-a7c06a62fdf9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalAttributableToNoncontrollingInterest_ebdd496d-a528-49b4-b9cb-806dd189ae00" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PartnersCapitalAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_a99ad9e2-ae94-4413-a8c6-d9ff0446ad20" xlink:to="loc_us-gaap_PartnersCapitalAttributableToNoncontrollingInterest_ebdd496d-a528-49b4-b9cb-806dd189ae00" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesNoncurrent_2d01a8f7-65e7-42d6-b756-3f17300a936f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesNoncurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorLongTermNotes_3ff975f8-0131-4b2a-8956-a0bc31f6a7aa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeniorLongTermNotes"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesNoncurrent_2d01a8f7-65e7-42d6-b756-3f17300a936f" xlink:to="loc_us-gaap_SeniorLongTermNotes_3ff975f8-0131-4b2a-8956-a0bc31f6a7aa" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_9a69de23-2a17-48c0-acc7-4859b616374c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesNoncurrent_2d01a8f7-65e7-42d6-b756-3f17300a936f" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_9a69de23-2a17-48c0-acc7-4859b616374c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLongTermDebtNoncurrent_36d309cc-1249-4ab6-99e7-f6a93b312d07" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLongTermDebtNoncurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesNoncurrent_2d01a8f7-65e7-42d6-b756-3f17300a936f" xlink:to="loc_us-gaap_OtherLongTermDebtNoncurrent_36d309cc-1249-4ab6-99e7-f6a93b312d07" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_565959a6-9b4f-45a1-85aa-742d9dca7ea3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesNoncurrent_2d01a8f7-65e7-42d6-b756-3f17300a936f" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_565959a6-9b4f-45a1-85aa-742d9dca7ea3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent_99f86f38-f608-4e38-86c3-1abfed2e99d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesNoncurrent_2d01a8f7-65e7-42d6-b756-3f17300a936f" xlink:to="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent_99f86f38-f608-4e38-86c3-1abfed2e99d5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_be1c71b8-9912-434b-b2b2-3a22b2a5d054" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_aa89ebde-8769-4aed-b513-5c7504c7edeb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_be1c71b8-9912-434b-b2b2-3a22b2a5d054" xlink:to="loc_us-gaap_AssetsCurrent_aa89ebde-8769-4aed-b513-5c7504c7edeb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_537af1ad-c940-4108-a70c-c051b49e471f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_be1c71b8-9912-434b-b2b2-3a22b2a5d054" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_537af1ad-c940-4108-a70c-c051b49e471f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_62c9a6f6-ce45-4c5e-89cc-1ae954b7f729" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestments"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_be1c71b8-9912-434b-b2b2-3a22b2a5d054" xlink:to="loc_us-gaap_EquityMethodInvestments_62c9a6f6-ce45-4c5e-89cc-1ae954b7f729" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxAssetsNet_a2cdccd4-1928-4b21-9edc-fe1b356f4928" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxAssetsNet"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_be1c71b8-9912-434b-b2b2-3a22b2a5d054" xlink:to="loc_us-gaap_DeferredIncomeTaxAssetsNet_a2cdccd4-1928-4b21-9edc-fe1b356f4928" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pagp_Linefill_906eb72d-4352-486e-b7d5-54f9d8e0d169" xlink:href="pagp-20250630.xsd#pagp_Linefill"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_be1c71b8-9912-434b-b2b2-3a22b2a5d054" xlink:to="loc_pagp_Linefill_906eb72d-4352-486e-b7d5-54f9d8e0d169" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNoncurrent_5dcc863e-4bec-49e7-807e-0f2f756bffc3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InventoryNoncurrent"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_be1c71b8-9912-434b-b2b2-3a22b2a5d054" xlink:to="loc_us-gaap_InventoryNoncurrent_5dcc863e-4bec-49e7-807e-0f2f756bffc3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_3c06e826-ea18-418c-865a-93fe459fcdfa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_be1c71b8-9912-434b-b2b2-3a22b2a5d054" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_3c06e826-ea18-418c-865a-93fe459fcdfa" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_6d9b09c5-b948-44aa-84aa-e2b366d4c3be" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_be1c71b8-9912-434b-b2b2-3a22b2a5d054" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_6d9b09c5-b948-44aa-84aa-e2b366d4c3be" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_1f216691-c05a-4e16-8dfe-3ea3ebdd8fbb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_be1c71b8-9912-434b-b2b2-3a22b2a5d054" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_1f216691-c05a-4e16-8dfe-3ea3ebdd8fbb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent_1d767782-23cb-439b-bf2b-526a879b2468" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_be1c71b8-9912-434b-b2b2-3a22b2a5d054" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent_1d767782-23cb-439b-bf2b-526a879b2468" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_6912f4f8-cec9-468d-ad66-6a5806b54647" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableTradeCurrent_6578fd05-ee32-47f9-98d5-418dde61e255" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsPayableTradeCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_6912f4f8-cec9-468d-ad66-6a5806b54647" xlink:to="loc_us-gaap_AccountsPayableTradeCurrent_6578fd05-ee32-47f9-98d5-418dde61e255" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtCurrent_d54e33fc-0b61-4f29-93ff-2dafc4f8f48d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_6912f4f8-cec9-468d-ad66-6a5806b54647" xlink:to="loc_us-gaap_DebtCurrent_d54e33fc-0b61-4f29-93ff-2dafc4f8f48d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_f5272e17-8771-4311-ad63-60d223e17f0b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLiabilitiesCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_6912f4f8-cec9-468d-ad66-6a5806b54647" xlink:to="loc_us-gaap_OtherLiabilitiesCurrent_f5272e17-8771-4311-ad63-60d223e17f0b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent_c34b0b6f-6672-458b-b48c-a692586b70d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_6912f4f8-cec9-468d-ad66-6a5806b54647" xlink:to="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent_c34b0b6f-6672-458b-b48c-a692586b70d9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_2bf96eda-0e85-4ce3-89c0-ef1e063499ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_d7210531-4bf2-4285-9f5d-061b7e554f00" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_2bf96eda-0e85-4ce3-89c0-ef1e063499ac" xlink:to="loc_us-gaap_LiabilitiesCurrent_d7210531-4bf2-4285-9f5d-061b7e554f00" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesNoncurrent_94a9d4f3-9950-49b6-87b7-56e3dcac3567" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_2bf96eda-0e85-4ce3-89c0-ef1e063499ac" xlink:to="loc_us-gaap_LiabilitiesNoncurrent_94a9d4f3-9950-49b6-87b7-56e3dcac3567" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_c54b7389-23b1-4278-8e46-550cbd2b8a38" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_2bf96eda-0e85-4ce3-89c0-ef1e063499ac" xlink:to="loc_us-gaap_CommitmentsAndContingencies_c54b7389-23b1-4278-8e46-550cbd2b8a38" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_78f094d5-220e-464c-9002-a4626e0a5403" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_2bf96eda-0e85-4ce3-89c0-ef1e063499ac" xlink:to="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_78f094d5-220e-464c-9002-a4626e0a5403" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_1f877b7f-f370-4634-af31-9035885c32a9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_dc1772df-6eb9-447f-bd98-bbf0cc3861ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_1f877b7f-f370-4634-af31-9035885c32a9" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_dc1772df-6eb9-447f-bd98-bbf0cc3861ad" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesNetCurrent_33005a7a-48f5-4bda-826b-af980e4c616d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReceivablesNetCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_1f877b7f-f370-4634-af31-9035885c32a9" xlink:to="loc_us-gaap_ReceivablesNetCurrent_33005a7a-48f5-4bda-826b-af980e4c616d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_1a9102d8-0601-444d-a8f5-639826baeb4b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InventoryNet"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_1f877b7f-f370-4634-af31-9035885c32a9" xlink:to="loc_us-gaap_InventoryNet_1a9102d8-0601-444d-a8f5-639826baeb4b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsCurrent_3c44fcf8-99e8-43d5-848d-f2978ce9d6e1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAssetsCurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_1f877b7f-f370-4634-af31-9035885c32a9" xlink:to="loc_us-gaap_OtherAssetsCurrent_3c44fcf8-99e8-43d5-848d-f2978ce9d6e1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_ff327e9e-a6c1-4b2c-9ce1-c1ddfcb359a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_1f877b7f-f370-4634-af31-9035885c32a9" xlink:to="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_ff327e9e-a6c1-4b2c-9ce1-c1ddfcb359a4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_cbcca897-c983-43ed-9efc-d3e8b422f541" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_ee4950d1-afbf-428f-9cfa-54c1227a8e2b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_cbcca897-c983-43ed-9efc-d3e8b422f541" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_ee4950d1-afbf-428f-9cfa-54c1227a8e2b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_30501685-6410-4787-b79e-21d7a79fc7cd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_cbcca897-c983-43ed-9efc-d3e8b422f541" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_30501685-6410-4787-b79e-21d7a79fc7cd" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.paalp.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONS" xlink:type="simple" xlink:href="pagp-20250630.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONS"/>
  <link:calculationLink xlink:role="http://www.paalp.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_596f40fe-40ba-4067-adc5-80a5359bb7d0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_216d6cca-1ed7-47cf-ab16-5ef569ca95c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProfitLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_596f40fe-40ba-4067-adc5-80a5359bb7d0" xlink:to="loc_us-gaap_ProfitLoss_216d6cca-1ed7-47cf-ab16-5ef569ca95c9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_40291210-f997-41e2-be67-7fc1df0831a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_596f40fe-40ba-4067-adc5-80a5359bb7d0" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_40291210-f997-41e2-be67-7fc1df0831a7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpenses_8c625545-51a9-411c-b0d3-6572bb871998" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostsAndExpenses"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_ddb70245-b9ff-42be-a1a3-5de5a8c35477" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_8c625545-51a9-411c-b0d3-6572bb871998" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_ddb70245-b9ff-42be-a1a3-5de5a8c35477" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingCostsAndExpenses_96ccfd89-bbe9-48c9-bbef-da90e826d7ec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingCostsAndExpenses"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_8c625545-51a9-411c-b0d3-6572bb871998" xlink:to="loc_us-gaap_OperatingCostsAndExpenses_96ccfd89-bbe9-48c9-bbef-da90e826d7ec" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_86457319-9b54-42d8-911f-45f182ed670f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GeneralAndAdministrativeExpense"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_8c625545-51a9-411c-b0d3-6572bb871998" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_86457319-9b54-42d8-911f-45f182ed670f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_b53acab2-b3cc-46a4-abb4-3ed6517fe55e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_8c625545-51a9-411c-b0d3-6572bb871998" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_b53acab2-b3cc-46a4-abb4-3ed6517fe55e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_692e88df-82bf-48b9-b551-99b983e52a75" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_8c625545-51a9-411c-b0d3-6572bb871998" xlink:to="loc_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_692e88df-82bf-48b9-b551-99b983e52a75" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_80ec679a-551f-4dd0-b1e3-c0432f37916c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_pagp_GainsLossesOnInvestmentsInUnconsolidatedEntitiesNet_95c9d03f-b380-4bf1-8b14-372c988702f7" xlink:href="pagp-20250630.xsd#pagp_GainsLossesOnInvestmentsInUnconsolidatedEntitiesNet"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_80ec679a-551f-4dd0-b1e3-c0432f37916c" xlink:to="loc_pagp_GainsLossesOnInvestmentsInUnconsolidatedEntitiesNet_95c9d03f-b380-4bf1-8b14-372c988702f7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_93f0a405-e39d-43e1-b890-5006dc127a7c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_80ec679a-551f-4dd0-b1e3-c0432f37916c" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_93f0a405-e39d-43e1-b890-5006dc127a7c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseNonoperating_91405c63-236a-463d-a138-5ee77e5c4e91" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseNonoperating"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_80ec679a-551f-4dd0-b1e3-c0432f37916c" xlink:to="loc_us-gaap_InterestExpenseNonoperating_91405c63-236a-463d-a138-5ee77e5c4e91" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_3650c022-7af5-4b7a-b09e-d103b02930bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_80ec679a-551f-4dd0-b1e3-c0432f37916c" xlink:to="loc_us-gaap_OperatingIncomeLoss_3650c022-7af5-4b7a-b09e-d103b02930bd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_3ff442ac-8893-4c95-8385-fad8a3aad6d8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromEquityMethodInvestments"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_80ec679a-551f-4dd0-b1e3-c0432f37916c" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_3ff442ac-8893-4c95-8385-fad8a3aad6d8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_4ad008c5-3b29-4e45-b648-4068d5037f40" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_75b533a8-dc2e-4ba0-8401-cebb61e6f85b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_4ad008c5-3b29-4e45-b648-4068d5037f40" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_75b533a8-dc2e-4ba0-8401-cebb61e6f85b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_6659d509-aa0b-4f3d-9aa2-81581d4c1d60" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CurrentIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_4ad008c5-3b29-4e45-b648-4068d5037f40" xlink:to="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_6659d509-aa0b-4f3d-9aa2-81581d4c1d60" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_28e1411f-e1ea-493c-9942-21d6b2a2baea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_4ad008c5-3b29-4e45-b648-4068d5037f40" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_28e1411f-e1ea-493c-9942-21d6b2a2baea" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_b11f81d3-6528-4aeb-a659-be9c8538d58b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity_b0b79ec6-f522-4676-b088-f626d644dc14" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_b11f81d3-6528-4aeb-a659-be9c8538d58b" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity_b0b79ec6-f522-4676-b088-f626d644dc14" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest_f322090e-5e8c-4598-92b3-d79576f1f5c6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_b11f81d3-6528-4aeb-a659-be9c8538d58b" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest_f322090e-5e8c-4598-92b3-d79576f1f5c6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_0eec0dd4-a012-4108-8965-70e521237d76" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProfitLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_ba6f652f-2f34-414d-8779-213cc314b02c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_0eec0dd4-a012-4108-8965-70e521237d76" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_ba6f652f-2f34-414d-8779-213cc314b02c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_c2e51bc6-fffb-4b20-b177-61dfa204efb0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_0eec0dd4-a012-4108-8965-70e521237d76" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_c2e51bc6-fffb-4b20-b177-61dfa204efb0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_fe83760e-8f67-4c0f-ae56-d12fab1281f8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_47d76b0a-22cc-4bd7-946a-057504f30269" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_fe83760e-8f67-4c0f-ae56-d12fab1281f8" xlink:to="loc_us-gaap_Revenues_47d76b0a-22cc-4bd7-946a-057504f30269" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpenses_9951e7bb-ace0-4901-b0aa-6bc5794f58dd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostsAndExpenses"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_fe83760e-8f67-4c0f-ae56-d12fab1281f8" xlink:to="loc_us-gaap_CostsAndExpenses_9951e7bb-ace0-4901-b0aa-6bc5794f58dd" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.paalp.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONS_1" xlink:type="simple" xlink:href="pagp-20250630.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONS_1"/>
  <link:calculationLink xlink:role="http://www.paalp.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONS_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_c998a20b-530e-4d32-940a-b70d728cb61b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperations_8e4d676f-0d54-4520-b2bd-48c51a6c3abe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperations"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_c998a20b-530e-4d32-940a-b70d728cb61b" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperations_8e4d676f-0d54-4520-b2bd-48c51a6c3abe" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_845d521c-ad20-4379-8f4e-c562b69a0c09" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_c998a20b-530e-4d32-940a-b70d728cb61b" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_845d521c-ad20-4379-8f4e-c562b69a0c09" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.paalp.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME" xlink:type="simple" xlink:href="pagp-20250630.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME"/>
  <link:calculationLink xlink:role="http://www.paalp.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_a770e08f-67a4-4af8-a2b3-69dc07fd52e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_9d842c91-edd9-458a-b6c4-953d78d469a3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProfitLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_a770e08f-67a4-4af8-a2b3-69dc07fd52e6" xlink:to="loc_us-gaap_ProfitLoss_9d842c91-edd9-458a-b6c4-953d78d469a3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_1ae7e044-88a7-4710-8315-f0286526431c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_a770e08f-67a4-4af8-a2b3-69dc07fd52e6" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_1ae7e044-88a7-4710-8315-f0286526431c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_2bdf9e60-9cb6-48a8-8dee-dc4e55e83cea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_ee641bbd-cc2e-4be9-9e4e-bca93115f5ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_2bdf9e60-9cb6-48a8-8dee-dc4e55e83cea" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_ee641bbd-cc2e-4be9-9e4e-bca93115f5ea" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_54d33373-dd48-41ff-b392-e694a504fc36" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_2bdf9e60-9cb6-48a8-8dee-dc4e55e83cea" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_54d33373-dd48-41ff-b392-e694a504fc36" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.paalp.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCHANGESINACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSS" xlink:type="simple" xlink:href="pagp-20250630.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFCHANGESINACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSS"/>
  <link:calculationLink xlink:role="http://www.paalp.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCHANGESINACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_2992a01d-543d-4317-b698-7d9a4fac5b1d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_ddb16b5e-309d-4154-babf-505d711d00df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_2992a01d-543d-4317-b698-7d9a4fac5b1d" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_ddb16b5e-309d-4154-babf-505d711d00df" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_dd78549f-ca30-41f6-89cb-efc26650c139" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_2992a01d-543d-4317-b698-7d9a4fac5b1d" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_dd78549f-ca30-41f6-89cb-efc26650c139" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_1c4408f5-fa95-41eb-8e9c-2d446b40bd76" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_2992a01d-543d-4317-b698-7d9a4fac5b1d" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_1c4408f5-fa95-41eb-8e9c-2d446b40bd76" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.paalp.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="simple" xlink:href="pagp-20250630.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS"/>
  <link:calculationLink xlink:role="http://www.paalp.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_4694779c-bd2c-4948-8110-ae49f648ed71" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_1f8c3340-f7d8-4477-aca0-b9e107f4d917" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_4694779c-bd2c-4948-8110-ae49f648ed71" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_1f8c3340-f7d8-4477-aca0-b9e107f4d917" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations_9f893659-9270-474d-a1ca-24140dd63c10" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_4694779c-bd2c-4948-8110-ae49f648ed71" xlink:to="loc_us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations_9f893659-9270-474d-a1ca-24140dd63c10" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_931814bb-313a-42d5-b0fd-73fe173de4e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_00b8addd-47ec-4728-a7b8-c614d3ba3d3b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_931814bb-313a-42d5-b0fd-73fe173de4e5" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_00b8addd-47ec-4728-a7b8-c614d3ba3d3b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations_0b8f4e71-aab4-4c07-964b-3f992b923648" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_931814bb-313a-42d5-b0fd-73fe173de4e5" xlink:to="loc_us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations_0b8f4e71-aab4-4c07-964b-3f992b923648" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_c81d915f-54f5-47c3-bfe0-1ca311b5f1cb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_6546e247-ce1c-4628-a79a-619541464cb3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProfitLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_c81d915f-54f5-47c3-bfe0-1ca311b5f1cb" xlink:to="loc_us-gaap_ProfitLoss_6546e247-ce1c-4628-a79a-619541464cb3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_35f17b16-f1cc-4a9e-8f63-92aaa8e981fd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_c81d915f-54f5-47c3-bfe0-1ca311b5f1cb" xlink:to="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_35f17b16-f1cc-4a9e-8f63-92aaa8e981fd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_b64f649f-661a-4df8-af48-b3188f0d90b3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_c81d915f-54f5-47c3-bfe0-1ca311b5f1cb" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_b64f649f-661a-4df8-af48-b3188f0d90b3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_06a2643d-2cee-40a0-95fb-b5a89c39e4a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_c81d915f-54f5-47c3-bfe0-1ca311b5f1cb" xlink:to="loc_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_06a2643d-2cee-40a0-95fb-b5a89c39e4a1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_9b6c7c26-8d1c-4cf5-be21-1724fa426801" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_c81d915f-54f5-47c3-bfe0-1ca311b5f1cb" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_9b6c7c26-8d1c-4cf5-be21-1724fa426801" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_8b046ba1-3949-4888-b4df-28c0a2a090ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignCurrencyTransactionGainLossBeforeTax"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_c81d915f-54f5-47c3-bfe0-1ca311b5f1cb" xlink:to="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_8b046ba1-3949-4888-b4df-28c0a2a090ee" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pagp_NetCashPaidReceivedForTerminatedHedgingInstruments_b295763c-4ad5-47a8-a784-940576279aa4" xlink:href="pagp-20250630.xsd#pagp_NetCashPaidReceivedForTerminatedHedgingInstruments"/>
    <link:calculationArc order="7" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_c81d915f-54f5-47c3-bfe0-1ca311b5f1cb" xlink:to="loc_pagp_NetCashPaidReceivedForTerminatedHedgingInstruments_b295763c-4ad5-47a8-a784-940576279aa4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_1985041c-f0da-4beb-a902-f24f054caa31" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromEquityMethodInvestments"/>
    <link:calculationArc order="8" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_c81d915f-54f5-47c3-bfe0-1ca311b5f1cb" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_1985041c-f0da-4beb-a902-f24f054caa31" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentDividendsOrDistributions_da0e726d-d8c7-45bc-9239-0e1933d0f51e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentDividendsOrDistributions"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_c81d915f-54f5-47c3-bfe0-1ca311b5f1cb" xlink:to="loc_us-gaap_EquityMethodInvestmentDividendsOrDistributions_da0e726d-d8c7-45bc-9239-0e1933d0f51e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pagp_GainsLossesOnInvestmentsInUnconsolidatedEntitiesNet_32298a9b-1960-4731-ab9f-ed5d1ada2e75" xlink:href="pagp-20250630.xsd#pagp_GainsLossesOnInvestmentsInUnconsolidatedEntitiesNet"/>
    <link:calculationArc order="10" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_c81d915f-54f5-47c3-bfe0-1ca311b5f1cb" xlink:to="loc_pagp_GainsLossesOnInvestmentsInUnconsolidatedEntitiesNet_32298a9b-1960-4731-ab9f-ed5d1ada2e75" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncashIncomeExpense_5bf2052b-f65e-4d52-a3bd-7b6d46ef0a85" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNoncashIncomeExpense"/>
    <link:calculationArc order="11" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_c81d915f-54f5-47c3-bfe0-1ca311b5f1cb" xlink:to="loc_us-gaap_OtherNoncashIncomeExpense_5bf2052b-f65e-4d52-a3bd-7b6d46ef0a85" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapital_5d5ec2c4-63f8-4449-966a-8bd369dcd5a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInOperatingCapital"/>
    <link:calculationArc order="12" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_c81d915f-54f5-47c3-bfe0-1ca311b5f1cb" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingCapital_5d5ec2c4-63f8-4449-966a-8bd369dcd5a8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2a2d3c2a-b018-46f3-8a36-767348f5ecd5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates_013c5c3a-4de2-41bc-b929-24c26ccff6d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2a2d3c2a-b018-46f3-8a36-767348f5ecd5" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates_013c5c3a-4de2-41bc-b929-24c26ccff6d5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pagp_CapitalContributionsToEquityMethodInvestees_6f8f791c-aa71-47b9-b5fc-1335ff70f7c5" xlink:href="pagp-20250630.xsd#pagp_CapitalContributionsToEquityMethodInvestees"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2a2d3c2a-b018-46f3-8a36-767348f5ecd5" xlink:to="loc_pagp_CapitalContributionsToEquityMethodInvestees_6f8f791c-aa71-47b9-b5fc-1335ff70f7c5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_a9d0ba5b-d47c-474a-894d-0e226e437fc6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2a2d3c2a-b018-46f3-8a36-767348f5ecd5" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_a9d0ba5b-d47c-474a-894d-0e226e437fc6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pagp_CashPaidRelatedToPurchasesOfLinefill_1367bc7c-874e-49e1-83ed-dc62438c569e" xlink:href="pagp-20250630.xsd#pagp_CashPaidRelatedToPurchasesOfLinefill"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2a2d3c2a-b018-46f3-8a36-767348f5ecd5" xlink:to="loc_pagp_CashPaidRelatedToPurchasesOfLinefill_1367bc7c-874e-49e1-83ed-dc62438c569e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfProductiveAssets_1d94bfb9-6085-4794-8104-75c28d976347" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromSaleOfProductiveAssets"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2a2d3c2a-b018-46f3-8a36-767348f5ecd5" xlink:to="loc_us-gaap_ProceedsFromSaleOfProductiveAssets_1d94bfb9-6085-4794-8104-75c28d976347" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_1726f87b-aa95-46b9-9045-6949ae0e4eca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2a2d3c2a-b018-46f3-8a36-767348f5ecd5" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_1726f87b-aa95-46b9-9045-6949ae0e4eca" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_e2f9538b-80f0-4800-9906-7f0a998607cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_6a34551f-63e0-4092-8c55-a1e916ead1e2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_e2f9538b-80f0-4800-9906-7f0a998607cf" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_6a34551f-63e0-4092-8c55-a1e916ead1e2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_c5cf09d2-0468-465b-aabf-b3e3d062f7b3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_e2f9538b-80f0-4800-9906-7f0a998607cf" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_c5cf09d2-0468-465b-aabf-b3e3d062f7b3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_973711aa-d1a1-404a-87d1-a0b8395b3497" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_e2f9538b-80f0-4800-9906-7f0a998607cf" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_973711aa-d1a1-404a-87d1-a0b8395b3497" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_d088c915-8de8-4f86-8062-df53868a7f0e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_e2f9538b-80f0-4800-9906-7f0a998607cf" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_d088c915-8de8-4f86-8062-df53868a7f0e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsDisposalGroupIncludingDiscontinuedOperations_756c6740-8393-4d8e-b34a-69795a990bac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsDisposalGroupIncludingDiscontinuedOperations"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_e2f9538b-80f0-4800-9906-7f0a998607cf" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsDisposalGroupIncludingDiscontinuedOperations_756c6740-8393-4d8e-b34a-69795a990bac" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_c759382a-c9c7-4e74-a81c-b2a810aeb7af" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromRepaymentsOfCommercialPaper_1bb217d1-7dfb-4394-82b3-d53aadcfb3d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromRepaymentsOfCommercialPaper"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_c759382a-c9c7-4e74-a81c-b2a810aeb7af" xlink:to="loc_us-gaap_ProceedsFromRepaymentsOfCommercialPaper_1bb217d1-7dfb-4394-82b3-d53aadcfb3d4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt_b60c672a-8595-4509-a2dd-97d1c3356b20" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_c759382a-c9c7-4e74-a81c-b2a810aeb7af" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt_b60c672a-8595-4509-a2dd-97d1c3356b20" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToMinorityShareholders_0ba6a6d9-ddd0-49c1-b312-5181ba4d203d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToMinorityShareholders"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_c759382a-c9c7-4e74-a81c-b2a810aeb7af" xlink:to="loc_us-gaap_PaymentsToMinorityShareholders_0ba6a6d9-ddd0-49c1-b312-5181ba4d203d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock_d128ec28-f803-408f-b69d-616828fd8d4d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_c759382a-c9c7-4e74-a81c-b2a810aeb7af" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock_d128ec28-f803-408f-b69d-616828fd8d4d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid_cae5a9d9-a28c-4df7-9257-e25d249c0ff3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_c759382a-c9c7-4e74-a81c-b2a810aeb7af" xlink:to="loc_us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid_cae5a9d9-a28c-4df7-9257-e25d249c0ff3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsMinorityInterest_b599815a-f593-4a1b-87d0-e5621b8b803c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsOfDividendsMinorityInterest"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_c759382a-c9c7-4e74-a81c-b2a810aeb7af" xlink:to="loc_us-gaap_PaymentsOfDividendsMinorityInterest_b599815a-f593-4a1b-87d0-e5621b8b803c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromMinorityShareholders_acdb48ac-a7fe-4c1f-a624-112335426b18" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromMinorityShareholders"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_c759382a-c9c7-4e74-a81c-b2a810aeb7af" xlink:to="loc_us-gaap_ProceedsFromMinorityShareholders_acdb48ac-a7fe-4c1f-a624-112335426b18" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_a46e215b-3c84-490c-ae0e-9c11f0aac733" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromPaymentsForOtherFinancingActivities"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_c759382a-c9c7-4e74-a81c-b2a810aeb7af" xlink:to="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_a46e215b-3c84-490c-ae0e-9c11f0aac733" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.paalp.com/role/DiscontinuedOperationsAssetsandLiabilitiesofDiscontinuedOperationsDetails" xlink:type="simple" xlink:href="pagp-20250630.xsd#DiscontinuedOperationsAssetsandLiabilitiesofDiscontinuedOperationsDetails"/>
  <link:calculationLink xlink:role="http://www.paalp.com/role/DiscontinuedOperationsAssetsandLiabilitiesofDiscontinuedOperationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_a591df64-a76e-45c3-be40-f933c3811102" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet_d407edc8-e44f-45f3-bc64-e88223c3e2b9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_a591df64-a76e-45c3-be40-f933c3811102" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet_d407edc8-e44f-45f3-bc64-e88223c3e2b9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationInventoryCurrent_a7d961a3-f184-4172-8876-4d32a3512af1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationInventoryCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_a591df64-a76e-45c3-be40-f933c3811102" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationInventoryCurrent_a7d961a3-f184-4172-8876-4d32a3512af1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets_2a549674-9b8a-4e5a-8be2-a4f2164feeb9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_a591df64-a76e-45c3-be40-f933c3811102" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets_2a549674-9b8a-4e5a-8be2-a4f2164feeb9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent_9cf8c513-5652-4b1e-a44a-38357a2ef502" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_pagp_DisposalGroupIncludingDiscontinuedOperationOperatingLeaseLiabilitiesNoncurrent_bc472544-8c55-4e7a-9a30-4d11f9fef5d2" xlink:href="pagp-20250630.xsd#pagp_DisposalGroupIncludingDiscontinuedOperationOperatingLeaseLiabilitiesNoncurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent_9cf8c513-5652-4b1e-a44a-38357a2ef502" xlink:to="loc_pagp_DisposalGroupIncludingDiscontinuedOperationOperatingLeaseLiabilitiesNoncurrent_bc472544-8c55-4e7a-9a30-4d11f9fef5d2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities_c35ecc66-461d-434c-85fb-c3a6a60b7e4b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent_9cf8c513-5652-4b1e-a44a-38357a2ef502" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities_c35ecc66-461d-434c-85fb-c3a6a60b7e4b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent_fec3b8e0-6086-46aa-81f5-897f1e13e3c1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_pagp_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNet_b0dec6d2-1809-4483-b26e-0ef415bbff9f" xlink:href="pagp-20250630.xsd#pagp_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNet"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent_fec3b8e0-6086-46aa-81f5-897f1e13e3c1" xlink:to="loc_pagp_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNet_b0dec6d2-1809-4483-b26e-0ef415bbff9f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pagp_DisposalGroupIncludingDiscontinuedOperationLinefillNoncurrent_abd1a3c9-1b8f-4c68-97ee-f4c0f5635a93" xlink:href="pagp-20250630.xsd#pagp_DisposalGroupIncludingDiscontinuedOperationLinefillNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent_fec3b8e0-6086-46aa-81f5-897f1e13e3c1" xlink:to="loc_pagp_DisposalGroupIncludingDiscontinuedOperationLinefillNoncurrent_abd1a3c9-1b8f-4c68-97ee-f4c0f5635a93" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pagp_DisposalGroupIncludingDiscontinuedOperationOperatingLeaseRightOfUseAssetsNoncurrent_a779b144-2b21-4a57-99bb-bf3ead928adc" xlink:href="pagp-20250630.xsd#pagp_DisposalGroupIncludingDiscontinuedOperationOperatingLeaseRightOfUseAssetsNoncurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent_fec3b8e0-6086-46aa-81f5-897f1e13e3c1" xlink:to="loc_pagp_DisposalGroupIncludingDiscontinuedOperationOperatingLeaseRightOfUseAssetsNoncurrent_a779b144-2b21-4a57-99bb-bf3ead928adc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationInventoryNoncurrent_f222dedd-328c-4250-bdb3-b820ffca041d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationInventoryNoncurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent_fec3b8e0-6086-46aa-81f5-897f1e13e3c1" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationInventoryNoncurrent_f222dedd-328c-4250-bdb3-b820ffca041d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets_f5f26669-0c98-44ad-ac20-89639cb189f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent_fec3b8e0-6086-46aa-81f5-897f1e13e3c1" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets_f5f26669-0c98-44ad-ac20-89639cb189f3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent_56c1a143-14a8-49a4-95e9-9e91cc72945a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayableCurrent_2078232a-6144-445d-b0c2-beefd7a1ddbd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayableCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent_56c1a143-14a8-49a4-95e9-9e91cc72945a" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayableCurrent_2078232a-6144-445d-b0c2-beefd7a1ddbd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities_9f072e3c-aa59-43f5-8a07-974c4dc7cde5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent_56c1a143-14a8-49a4-95e9-9e91cc72945a" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities_9f072e3c-aa59-43f5-8a07-974c4dc7cde5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pagp_DisposalGroupIncludingDiscontinuedOperationDebtCurrent_31abcc61-030d-4baf-ab93-a3be41e43f1a" xlink:href="pagp-20250630.xsd#pagp_DisposalGroupIncludingDiscontinuedOperationDebtCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent_56c1a143-14a8-49a4-95e9-9e91cc72945a" xlink:to="loc_pagp_DisposalGroupIncludingDiscontinuedOperationDebtCurrent_31abcc61-030d-4baf-ab93-a3be41e43f1a" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.paalp.com/role/DiscontinuedOperationsIncomeLossfromDiscontinuedOperationsDetails" xlink:type="simple" xlink:href="pagp-20250630.xsd#DiscontinuedOperationsIncomeLossfromDiscontinuedOperationsDetails"/>
  <link:calculationLink xlink:role="http://www.paalp.com/role/DiscontinuedOperationsIncomeLossfromDiscontinuedOperationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_pagp_DisposalGroupIncludingDiscontinuedOperationCostsAndExpenses_03e716b5-ae5a-41b1-b120-9f22b4cbe102" xlink:href="pagp-20250630.xsd#pagp_DisposalGroupIncludingDiscontinuedOperationCostsAndExpenses"/>
    <link:loc xlink:type="locator" xlink:label="loc_pagp_DisposalGroupIncludingDiscontinuedOperationPurchasesAndRelatedCosts_1ec19d3e-5cd2-4dbf-a745-7f3c7e97bce5" xlink:href="pagp-20250630.xsd#pagp_DisposalGroupIncludingDiscontinuedOperationPurchasesAndRelatedCosts"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pagp_DisposalGroupIncludingDiscontinuedOperationCostsAndExpenses_03e716b5-ae5a-41b1-b120-9f22b4cbe102" xlink:to="loc_pagp_DisposalGroupIncludingDiscontinuedOperationPurchasesAndRelatedCosts_1ec19d3e-5cd2-4dbf-a745-7f3c7e97bce5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense_577c1320-ecaf-45ed-99e1-5d70f95b4d9c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pagp_DisposalGroupIncludingDiscontinuedOperationCostsAndExpenses_03e716b5-ae5a-41b1-b120-9f22b4cbe102" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense_577c1320-ecaf-45ed-99e1-5d70f95b4d9c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense_caf21b11-ac4a-4239-a7e8-b2ee07b68a6a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pagp_DisposalGroupIncludingDiscontinuedOperationCostsAndExpenses_03e716b5-ae5a-41b1-b120-9f22b4cbe102" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense_caf21b11-ac4a-4239-a7e8-b2ee07b68a6a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization_4307d278-0e46-402a-a4ee-b3984cab18ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pagp_DisposalGroupIncludingDiscontinuedOperationCostsAndExpenses_03e716b5-ae5a-41b1-b120-9f22b4cbe102" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization_4307d278-0e46-402a-a4ee-b3984cab18ce" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax_af3b1ab9-3af7-41a4-ae2a-3777962ce562" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pagp_DisposalGroupIncludingDiscontinuedOperationCostsAndExpenses_03e716b5-ae5a-41b1-b120-9f22b4cbe102" xlink:to="loc_us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax_af3b1ab9-3af7-41a4-ae2a-3777962ce562" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_80eaa6fa-3f7e-4f4b-8bb4-566ad58c836c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_pagp_DisposalGroupIncludingDiscontinuedOperationCostsAndExpenses_186c164c-f495-4caf-bc9a-1dc5a32531e8" xlink:href="pagp-20250630.xsd#pagp_DisposalGroupIncludingDiscontinuedOperationCostsAndExpenses"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_80eaa6fa-3f7e-4f4b-8bb4-566ad58c836c" xlink:to="loc_pagp_DisposalGroupIncludingDiscontinuedOperationCostsAndExpenses_186c164c-f495-4caf-bc9a-1dc5a32531e8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue_1413d4da-4d32-4517-b14a-ff6c5b9eec9b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_80eaa6fa-3f7e-4f4b-8bb4-566ad58c836c" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue_1413d4da-4d32-4517-b14a-ff6c5b9eec9b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_d1410a72-4959-455c-8ea6-a0e92b0a13dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_5e5b5daa-3a45-448f-ab11-950d4c90e2cc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_d1410a72-4959-455c-8ea6-a0e92b0a13dc" xlink:to="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_5e5b5daa-3a45-448f-ab11-950d4c90e2cc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pagp_DiscontinuedOperationCurrentIncomeTaxExpenseBenefit_a6d6ac5b-ee6f-4149-a04e-df15b89999db" xlink:href="pagp-20250630.xsd#pagp_DiscontinuedOperationCurrentIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_d1410a72-4959-455c-8ea6-a0e92b0a13dc" xlink:to="loc_pagp_DiscontinuedOperationCurrentIncomeTaxExpenseBenefit_a6d6ac5b-ee6f-4149-a04e-df15b89999db" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pagp_DiscontinuedOperationDeferredIncomeTaxExpenseBenefit_6635fd1d-9207-4764-9e2e-7c1fa9515f7f" xlink:href="pagp-20250630.xsd#pagp_DiscontinuedOperationDeferredIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_d1410a72-4959-455c-8ea6-a0e92b0a13dc" xlink:to="loc_pagp_DiscontinuedOperationDeferredIncomeTaxExpenseBenefit_6635fd1d-9207-4764-9e2e-7c1fa9515f7f" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.paalp.com/role/RevenuesandAccountsReceivableSegmentRevenueDetails" xlink:type="simple" xlink:href="pagp-20250630.xsd#RevenuesandAccountsReceivableSegmentRevenueDetails"/>
  <link:calculationLink xlink:role="http://www.paalp.com/role/RevenuesandAccountsReceivableSegmentRevenueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_ab18e3b6-6008-44a6-83a3-9758d5bc4bdd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueNotFromContractWithCustomer_1753c01a-d8b0-4af4-b45d-be4b69b5288e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueNotFromContractWithCustomer"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Revenues_ab18e3b6-6008-44a6-83a3-9758d5bc4bdd" xlink:to="loc_us-gaap_RevenueNotFromContractWithCustomer_1753c01a-d8b0-4af4-b45d-be4b69b5288e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_34db535e-809d-4145-92dc-a36785587a28" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Revenues_ab18e3b6-6008-44a6-83a3-9758d5bc4bdd" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_34db535e-809d-4145-92dc-a36785587a28" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.paalp.com/role/RevenuesandAccountsReceivableTradeAccountsReceivableandOtherReceivablesDetails" xlink:type="simple" xlink:href="pagp-20250630.xsd#RevenuesandAccountsReceivableTradeAccountsReceivableandOtherReceivablesDetails"/>
  <link:calculationLink xlink:role="http://www.paalp.com/role/RevenuesandAccountsReceivableTradeAccountsReceivableandOtherReceivablesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesNetCurrent_4f3480a1-394c-483c-8764-455f0858eb4f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReceivablesNetCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerAssetNetCurrent_fbaa92fb-7ca5-4cc1-a7cf-47d29c74f64b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerAssetNetCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ReceivablesNetCurrent_4f3480a1-394c-483c-8764-455f0858eb4f" xlink:to="loc_us-gaap_ContractWithCustomerAssetNetCurrent_fbaa92fb-7ca5-4cc1-a7cf-47d29c74f64b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsAndOtherReceivablesNetCurrent_4e84f3d9-2a88-4de1-a1f4-6cd758ddcc9c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsAndOtherReceivablesNetCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ReceivablesNetCurrent_4f3480a1-394c-483c-8764-455f0858eb4f" xlink:to="loc_us-gaap_AccountsAndOtherReceivablesNetCurrent_4e84f3d9-2a88-4de1-a1f4-6cd758ddcc9c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pagp_ContractWithCustomerContractualRightsOfOffsetWithCounterparties_aebb50a9-78d7-4a08-aaca-e35d28364a14" xlink:href="pagp-20250630.xsd#pagp_ContractWithCustomerContractualRightsOfOffsetWithCounterparties"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ReceivablesNetCurrent_4f3480a1-394c-483c-8764-455f0858eb4f" xlink:to="loc_pagp_ContractWithCustomerContractualRightsOfOffsetWithCounterparties_aebb50a9-78d7-4a08-aaca-e35d28364a14" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.paalp.com/role/InventoryLinefillandLongtermInventoryDetails" xlink:type="simple" xlink:href="pagp-20250630.xsd#InventoryLinefillandLongtermInventoryDetails"/>
  <link:calculationLink xlink:role="http://www.paalp.com/role/InventoryLinefillandLongtermInventoryDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_pagp_InventoryCurrentAndNoncurrent_b3b07b77-e7f2-4338-a261-3bd5430b7f94" xlink:href="pagp-20250630.xsd#pagp_InventoryCurrentAndNoncurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_eed9c945-d8e8-43a6-9edf-fb21191e623a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InventoryNet"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pagp_InventoryCurrentAndNoncurrent_b3b07b77-e7f2-4338-a261-3bd5430b7f94" xlink:to="loc_us-gaap_InventoryNet_eed9c945-d8e8-43a6-9edf-fb21191e623a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pagp_Linefill_b81461e1-2532-4814-b72c-12e124f589a8" xlink:href="pagp-20250630.xsd#pagp_Linefill"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pagp_InventoryCurrentAndNoncurrent_b3b07b77-e7f2-4338-a261-3bd5430b7f94" xlink:to="loc_pagp_Linefill_b81461e1-2532-4814-b72c-12e124f589a8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNoncurrent_2eb42881-9d35-4e5b-8817-d45a7c3ff80b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InventoryNoncurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pagp_InventoryCurrentAndNoncurrent_b3b07b77-e7f2-4338-a261-3bd5430b7f94" xlink:to="loc_us-gaap_InventoryNoncurrent_2eb42881-9d35-4e5b-8817-d45a7c3ff80b" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.paalp.com/role/DebtComponentsDetails" xlink:type="simple" xlink:href="pagp-20250630.xsd#DebtComponentsDetails"/>
  <link:calculationLink xlink:role="http://www.paalp.com/role/DebtComponentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_c805442e-248f-45f2-96c1-ecf47bed8436" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorLongTermNotes_e17a9661-0a42-4b14-8b44-97ec0948d1af" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeniorLongTermNotes"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_c805442e-248f-45f2-96c1-ecf47bed8436" xlink:to="loc_us-gaap_SeniorLongTermNotes_e17a9661-0a42-4b14-8b44-97ec0948d1af" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLongTermDebtNoncurrent_76f3bf94-f99e-4f10-a3d7-af1901bc876c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLongTermDebtNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_c805442e-248f-45f2-96c1-ecf47bed8436" xlink:to="loc_us-gaap_OtherLongTermDebtNoncurrent_76f3bf94-f99e-4f10-a3d7-af1901bc876c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtAndCapitalLeaseObligations_12d9f415-ee6f-4f2c-9fae-08a33302868f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtAndCapitalLeaseObligations"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtCurrent_7933b0c7-7f3f-4460-a473-9741d5a72856" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtAndCapitalLeaseObligations_12d9f415-ee6f-4f2c-9fae-08a33302868f" xlink:to="loc_us-gaap_DebtCurrent_7933b0c7-7f3f-4460-a473-9741d5a72856" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_92b59201-a406-47a9-938b-1bb9db138a63" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtAndCapitalLeaseObligations_12d9f415-ee6f-4f2c-9fae-08a33302868f" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_92b59201-a406-47a9-938b-1bb9db138a63" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.paalp.com/role/DerivativesandRiskManagementActivitiesOffsettingAssetandLiabilitiesDetails" xlink:type="simple" xlink:href="pagp-20250630.xsd#DerivativesandRiskManagementActivitiesOffsettingAssetandLiabilitiesDetails"/>
  <link:calculationLink xlink:role="http://www.paalp.com/role/DerivativesandRiskManagementActivitiesOffsettingAssetandLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_0af2905f-4e34-4489-b29b-3943ffdb8fcd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLiabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_08e96548-8b7b-4424-b017-729b8d6e53da" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeLiabilities_0af2905f-4e34-4489-b29b-3943ffdb8fcd" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_08e96548-8b7b-4424-b017-729b8d6e53da" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueGrossAsset_46f67e9a-c515-426c-aa0f-58f0840f49c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLiabilityFairValueGrossAsset"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeLiabilities_0af2905f-4e34-4489-b29b-3943ffdb8fcd" xlink:to="loc_us-gaap_DerivativeLiabilityFairValueGrossAsset_46f67e9a-c515-426c-aa0f-58f0840f49c7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset_b8d40a09-0413-4ff8-afdf-6b2eee7c112d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeLiabilities_0af2905f-4e34-4489-b29b-3943ffdb8fcd" xlink:to="loc_us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset_b8d40a09-0413-4ff8-afdf-6b2eee7c112d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet_16f76296-19a6-4b49-ac70-5b1257c97da1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset_f70b1e7f-b3a1-44d0-99ed-017158568966" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet_16f76296-19a6-4b49-ac70-5b1257c97da1" xlink:to="loc_us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset_f70b1e7f-b3a1-44d0-99ed-017158568966" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueGrossAsset_de1aa32e-f696-463e-9481-e51be1995b6c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLiabilityFairValueGrossAsset"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet_16f76296-19a6-4b49-ac70-5b1257c97da1" xlink:to="loc_us-gaap_DerivativeLiabilityFairValueGrossAsset_de1aa32e-f696-463e-9481-e51be1995b6c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_96a00ac7-62d4-4f2f-a8cf-2f1b72e0615b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet_16f76296-19a6-4b49-ac70-5b1257c97da1" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_96a00ac7-62d4-4f2f-a8cf-2f1b72e0615b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_3444e76a-2ce8-4fda-9716-689b163d47a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_1f955fcf-8c72-4859-9dd3-718896ea574a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssets_3444e76a-2ce8-4fda-9716-689b163d47a8" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_1f955fcf-8c72-4859-9dd3-718896ea574a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetFairValueGrossLiability_26952e2c-7794-4a5d-8960-06dcbc92339c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssetFairValueGrossLiability"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssets_3444e76a-2ce8-4fda-9716-689b163d47a8" xlink:to="loc_us-gaap_DerivativeAssetFairValueGrossLiability_26952e2c-7794-4a5d-8960-06dcbc92339c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset_f1268d92-4986-4b31-b783-f94c7a6dcbfc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssets_3444e76a-2ce8-4fda-9716-689b163d47a8" xlink:to="loc_us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset_f1268d92-4986-4b31-b783-f94c7a6dcbfc" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.paalp.com/role/CommitmentsandContingenciesScheduleofEnvironmentalLossContingenciesDetails" xlink:type="simple" xlink:href="pagp-20250630.xsd#CommitmentsandContingenciesScheduleofEnvironmentalLossContingenciesDetails"/>
  <link:calculationLink xlink:role="http://www.paalp.com/role/CommitmentsandContingenciesScheduleofEnvironmentalLossContingenciesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccrualForEnvironmentalLossContingenciesGross_afb24eda-e5dc-429d-af86-724170d163d8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccrualForEnvironmentalLossContingenciesGross"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedEnvironmentalLossContingenciesCurrent_5bb353ce-9fa1-4cc3-9280-97f8485dfc3b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccruedEnvironmentalLossContingenciesCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccrualForEnvironmentalLossContingenciesGross_afb24eda-e5dc-429d-af86-724170d163d8" xlink:to="loc_us-gaap_AccruedEnvironmentalLossContingenciesCurrent_5bb353ce-9fa1-4cc3-9280-97f8485dfc3b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent_6029bec0-b935-4cd2-bec6-75f2febd5f15" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccrualForEnvironmentalLossContingenciesGross_afb24eda-e5dc-429d-af86-724170d163d8" xlink:to="loc_us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent_6029bec0-b935-4cd2-bec6-75f2febd5f15" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.paalp.com/role/SegmentInformationSegmentFinancialDataDetails" xlink:type="simple" xlink:href="pagp-20250630.xsd#SegmentInformationSegmentFinancialDataDetails"/>
  <link:calculationLink xlink:role="http://www.paalp.com/role/SegmentInformationSegmentFinancialDataDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingOtherItemAmount_3d453f08-f0a2-4140-a506-b52d5c563c6d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingOtherItemAmount"/>
    <link:loc xlink:type="locator" xlink:label="loc_pagp_DepreciationAndAmortizationOfUnconsolidatedEntities_aa1625fa-dcbc-48c1-aad2-2fa80156da7f" xlink:href="pagp-20250630.xsd#pagp_DepreciationAndAmortizationOfUnconsolidatedEntities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SegmentReportingOtherItemAmount_3d453f08-f0a2-4140-a506-b52d5c563c6d" xlink:to="loc_pagp_DepreciationAndAmortizationOfUnconsolidatedEntities_aa1625fa-dcbc-48c1-aad2-2fa80156da7f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pagp_GainsLossesFromDerivativeActivitiesAndInventoryValuationAdjustments_8e5d1452-a4df-4d73-bd07-64fdab684566" xlink:href="pagp-20250630.xsd#pagp_GainsLossesFromDerivativeActivitiesAndInventoryValuationAdjustments"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SegmentReportingOtherItemAmount_3d453f08-f0a2-4140-a506-b52d5c563c6d" xlink:to="loc_pagp_GainsLossesFromDerivativeActivitiesAndInventoryValuationAdjustments_8e5d1452-a4df-4d73-bd07-64fdab684566" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pagp_LongTermInventoryCostingAdjustments_3620b128-50cf-47f0-8121-17543a0f8554" xlink:href="pagp-20250630.xsd#pagp_LongTermInventoryCostingAdjustments"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SegmentReportingOtherItemAmount_3d453f08-f0a2-4140-a506-b52d5c563c6d" xlink:to="loc_pagp_LongTermInventoryCostingAdjustments_3620b128-50cf-47f0-8121-17543a0f8554" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pagp_DeficienciesUnderMinimumVolumeCommitmentsNet_1ed15bfb-97bb-4b98-8f20-1e05785bf39f" xlink:href="pagp-20250630.xsd#pagp_DeficienciesUnderMinimumVolumeCommitmentsNet"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SegmentReportingOtherItemAmount_3d453f08-f0a2-4140-a506-b52d5c563c6d" xlink:to="loc_pagp_DeficienciesUnderMinimumVolumeCommitmentsNet_1ed15bfb-97bb-4b98-8f20-1e05785bf39f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pagp_EquityIndexedCompensationExpenseAwardsThatWillBeSettledInUnits_74d19f9b-ba57-4dca-900a-65488a3e4991" xlink:href="pagp-20250630.xsd#pagp_EquityIndexedCompensationExpenseAwardsThatWillBeSettledInUnits"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SegmentReportingOtherItemAmount_3d453f08-f0a2-4140-a506-b52d5c563c6d" xlink:to="loc_pagp_EquityIndexedCompensationExpenseAwardsThatWillBeSettledInUnits_74d19f9b-ba57-4dca-900a-65488a3e4991" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pagp_NetGainLossOnForeignCurrencyRevaluation_4c5a77c5-3c74-44f3-80fa-292fd2c12b7d" xlink:href="pagp-20250630.xsd#pagp_NetGainLossOnForeignCurrencyRevaluation"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SegmentReportingOtherItemAmount_3d453f08-f0a2-4140-a506-b52d5c563c6d" xlink:to="loc_pagp_NetGainLossOnForeignCurrencyRevaluation_4c5a77c5-3c74-44f3-80fa-292fd2c12b7d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pagp_TransactionRelatedExpenses_9410c1bb-7f54-452e-9b74-c6cd6cee57f7" xlink:href="pagp-20250630.xsd#pagp_TransactionRelatedExpenses"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SegmentReportingOtherItemAmount_3d453f08-f0a2-4140-a506-b52d5c563c6d" xlink:to="loc_pagp_TransactionRelatedExpenses_9410c1bb-7f54-452e-9b74-c6cd6cee57f7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pagp_SegmentAmountsAttributableToNoncontrollingInterests_1efbe19f-23b5-4a1d-8a20-fecd76d35a26" xlink:href="pagp-20250630.xsd#pagp_SegmentAmountsAttributableToNoncontrollingInterests"/>
    <link:calculationArc order="8" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SegmentReportingOtherItemAmount_3d453f08-f0a2-4140-a506-b52d5c563c6d" xlink:to="loc_pagp_SegmentAmountsAttributableToNoncontrollingInterests_1efbe19f-23b5-4a1d-8a20-fecd76d35a26" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pagp_SignificantSegmentExpenses_52ad6249-8518-4270-8af7-59861ce25602" xlink:href="pagp-20250630.xsd#pagp_SignificantSegmentExpenses"/>
    <link:loc xlink:type="locator" xlink:label="loc_pagp_GeneralAndAdministrativeExpenseExcludingUnallocatedAmount_9bdf8062-ebbc-4504-a49c-11a2a3516e57" xlink:href="pagp-20250630.xsd#pagp_GeneralAndAdministrativeExpenseExcludingUnallocatedAmount"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pagp_SignificantSegmentExpenses_52ad6249-8518-4270-8af7-59861ce25602" xlink:to="loc_pagp_GeneralAndAdministrativeExpenseExcludingUnallocatedAmount_9bdf8062-ebbc-4504-a49c-11a2a3516e57" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_23aa11bc-75a5-47cb-a2a9-f6126cb7ac8f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pagp_SignificantSegmentExpenses_52ad6249-8518-4270-8af7-59861ce25602" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_23aa11bc-75a5-47cb-a2a9-f6126cb7ac8f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingCostsAndExpenses_5b0b07b3-9665-4617-b6a3-9df2a5420418" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingCostsAndExpenses"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pagp_SignificantSegmentExpenses_52ad6249-8518-4270-8af7-59861ce25602" xlink:to="loc_us-gaap_OperatingCostsAndExpenses_5b0b07b3-9665-4617-b6a3-9df2a5420418" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.paalp.com/role/SegmentInformationSegmentAdjustedEBITDAReconciliationDetails" xlink:type="simple" xlink:href="pagp-20250630.xsd#SegmentInformationSegmentAdjustedEBITDAReconciliationDetails"/>
  <link:calculationLink xlink:role="http://www.paalp.com/role/SegmentInformationSegmentAdjustedEBITDAReconciliationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_bdbc376c-9fda-4911-8b56-4fa3df7562a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_7a4623b8-cadf-465d-ad4e-39e4cfcee76b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_bdbc376c-9fda-4911-8b56-4fa3df7562a5" xlink:to="loc_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_7a4623b8-cadf-465d-ad4e-39e4cfcee76b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_eff6241f-a27f-4599-b7ba-5a04011de149" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GeneralAndAdministrativeExpense"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_bdbc376c-9fda-4911-8b56-4fa3df7562a5" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_eff6241f-a27f-4599-b7ba-5a04011de149" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pagp_GainsLossesOnInvestmentsInUnconsolidatedEntitiesNet_47fe2126-8277-4ba9-928f-90b2e02dbaf1" xlink:href="pagp-20250630.xsd#pagp_GainsLossesOnInvestmentsInUnconsolidatedEntitiesNet"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_bdbc376c-9fda-4911-8b56-4fa3df7562a5" xlink:to="loc_pagp_GainsLossesOnInvestmentsInUnconsolidatedEntitiesNet_47fe2126-8277-4ba9-928f-90b2e02dbaf1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseNonoperating_987349fc-7e83-4195-8cee-97981e06e8ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseNonoperating"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_bdbc376c-9fda-4911-8b56-4fa3df7562a5" xlink:to="loc_us-gaap_InterestExpenseNonoperating_987349fc-7e83-4195-8cee-97981e06e8ef" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingOtherItemAmount_dd213c36-3af9-46c3-80b1-1d4d344861d8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingOtherItemAmount"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_bdbc376c-9fda-4911-8b56-4fa3df7562a5" xlink:to="loc_us-gaap_SegmentReportingOtherItemAmount_dd213c36-3af9-46c3-80b1-1d4d344861d8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_59dcf866-7d87-4139-be80-1fdd8dc281c8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_bdbc376c-9fda-4911-8b56-4fa3df7562a5" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_59dcf866-7d87-4139-be80-1fdd8dc281c8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_f83c9ec8-1169-478e-9155-d55c31f2eddf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_bdbc376c-9fda-4911-8b56-4fa3df7562a5" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_f83c9ec8-1169-478e-9155-d55c31f2eddf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pagp_SegmentAdjustedEBITDA_59889bf4-ef98-4a3c-85c1-7f8d5a0ed156" xlink:href="pagp-20250630.xsd#pagp_SegmentAdjustedEBITDA"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_bdbc376c-9fda-4911-8b56-4fa3df7562a5" xlink:to="loc_pagp_SegmentAdjustedEBITDA_59889bf4-ef98-4a3c-85c1-7f8d5a0ed156" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.paalp.com/role/AcquisitionsScheduleofAssetsAcquiredandLiabilitiesAssumedDetails" xlink:type="simple" xlink:href="pagp-20250630.xsd#AcquisitionsScheduleofAssetsAcquiredandLiabilitiesAssumedDetails"/>
  <link:calculationLink xlink:role="http://www.paalp.com/role/AcquisitionsScheduleofAssetsAcquiredandLiabilitiesAssumedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_79115b9b-b6bd-445a-b0ec-90da94ba17e3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_a28fec0d-4ed5-48c4-af1d-c4897b24b276" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_79115b9b-b6bd-445a-b0ec-90da94ba17e3" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_a28fec0d-4ed5-48c4-af1d-c4897b24b276" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_5e006ebb-dcc7-49c5-a6ab-0654a49e8cec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_79115b9b-b6bd-445a-b0ec-90da94ba17e3" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_5e006ebb-dcc7-49c5-a6ab-0654a49e8cec" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pagp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedWorkingCapitalAndOtherAssetsAndLiabilities_19d66fda-d878-49bc-bd1b-c7a4dac0535e" xlink:href="pagp-20250630.xsd#pagp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedWorkingCapitalAndOtherAssetsAndLiabilities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_79115b9b-b6bd-445a-b0ec-90da94ba17e3" xlink:to="loc_pagp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedWorkingCapitalAndOtherAssetsAndLiabilities_19d66fda-d878-49bc-bd1b-c7a4dac0535e" xlink:type="arc"/>
  </link:calculationLink>
</link:linkbase>
