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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2025 Workiva-->
<!--r:5041f2bb-a994-4f97-8b76-2f8425b51bd7,g:580d01de-4d07-4df9-8547-78e253020ba7-->
<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.westlake.com/role/ConsolidatedBalanceSheets" xlink:type="simple" xlink:href="wlkp-20250630.xsd#ConsolidatedBalanceSheets"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/ConsolidatedBalanceSheets" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_0bc6566a-fcc7-4e70-84e4-ef0df8a00be8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_b36d2014-6b94-443b-82d6-9087460ebd58" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_0bc6566a-fcc7-4e70-84e4-ef0df8a00be8" xlink:to="loc_us-gaap_AccountsPayableCurrent_b36d2014-6b94-443b-82d6-9087460ebd58" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_c6f0e055-205f-4089-8e51-28367476395a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_0bc6566a-fcc7-4e70-84e4-ef0df8a00be8" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_c6f0e055-205f-4089-8e51-28367476395a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_bcd16b17-7219-4d8f-83cc-9e04a1d2ddce" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AssetsCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_0e9580f2-d5fa-44a4-8217-719900cd2f50" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_bcd16b17-7219-4d8f-83cc-9e04a1d2ddce" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_0e9580f2-d5fa-44a4-8217-719900cd2f50" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_wlkp_ReceivablesunderInvestmentManagementAgreementswithRelatedPartiesCurrent_12c0bb52-ded7-4f1f-967c-72d044243319" xlink:href="wlkp-20250630.xsd#wlkp_ReceivablesunderInvestmentManagementAgreementswithRelatedPartiesCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_bcd16b17-7219-4d8f-83cc-9e04a1d2ddce" xlink:to="loc_wlkp_ReceivablesunderInvestmentManagementAgreementswithRelatedPartiesCurrent_12c0bb52-ded7-4f1f-967c-72d044243319" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_ea68380b-22e8-47dd-9db1-dd70cccc2fc8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_bcd16b17-7219-4d8f-83cc-9e04a1d2ddce" xlink:to="loc_us-gaap_InventoryNet_ea68380b-22e8-47dd-9db1-dd70cccc2fc8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_8e61444a-3d90-4ca5-a14c-b169e1863c0c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_bcd16b17-7219-4d8f-83cc-9e04a1d2ddce" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_8e61444a-3d90-4ca5-a14c-b169e1863c0c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_06d88ebd-38e4-48db-baed-4c29d2ba282e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_bcd16b17-7219-4d8f-83cc-9e04a1d2ddce" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_06d88ebd-38e4-48db-baed-4c29d2ba282e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesNetCurrent_9732ce30-5785-4844-b8fb-4bf2f065b325" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ReceivablesNetCurrent"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_bcd16b17-7219-4d8f-83cc-9e04a1d2ddce" xlink:to="loc_us-gaap_ReceivablesNetCurrent_9732ce30-5785-4844-b8fb-4bf2f065b325" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapital_f1d10ed5-66f6-4c37-9612-7daff4ba16a9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PartnersCapital"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccount_f0ce6090-d3d3-4833-99a4-12fc46aea158" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_PartnersCapital_f1d10ed5-66f6-4c37-9612-7daff4ba16a9" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccount_f0ce6090-d3d3-4833-99a4-12fc46aea158" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralPartnersCapitalAccount_9b911823-bb57-4f38-bffa-be560deda56f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GeneralPartnersCapitalAccount"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PartnersCapital_f1d10ed5-66f6-4c37-9612-7daff4ba16a9" xlink:to="loc_us-gaap_GeneralPartnersCapitalAccount_9b911823-bb57-4f38-bffa-be560deda56f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_6de234d8-a57e-4e88-aac9-07aa060ba7d6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapital_3fb08c0b-b827-4641-babe-3da5c73878b2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PartnersCapital"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_6de234d8-a57e-4e88-aac9-07aa060ba7d6" xlink:to="loc_us-gaap_PartnersCapital_3fb08c0b-b827-4641-babe-3da5c73878b2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestInLimitedPartnerships_9d516038-1b61-45ec-afbd-8fb09d739a7e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_MinorityInterestInLimitedPartnerships"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_6de234d8-a57e-4e88-aac9-07aa060ba7d6" xlink:to="loc_us-gaap_MinorityInterestInLimitedPartnerships_9d516038-1b61-45ec-afbd-8fb09d739a7e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_6b1e7857-a9b3-4db8-ad5a-03544b633e08" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_f72334f6-e4fb-480a-8d41-6782233f89ef" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Liabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_6b1e7857-a9b3-4db8-ad5a-03544b633e08" xlink:to="loc_us-gaap_Liabilities_f72334f6-e4fb-480a-8d41-6782233f89ef" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_f2ae6aed-6212-420d-a4a3-eaf925aa89d9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_6b1e7857-a9b3-4db8-ad5a-03544b633e08" xlink:to="loc_us-gaap_CommitmentsAndContingencies_f2ae6aed-6212-420d-a4a3-eaf925aa89d9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_d97f6456-85e4-40af-a1a9-7661fa9d763a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_6b1e7857-a9b3-4db8-ad5a-03544b633e08" xlink:to="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_d97f6456-85e4-40af-a1a9-7661fa9d763a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_ffe37671-02e4-4661-bada-6b20762612c7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Liabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_4a2dbd2f-70a5-436f-9b43-e2369fb6c3f0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_ffe37671-02e4-4661-bada-6b20762612c7" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_4a2dbd2f-70a5-436f-9b43-e2369fb6c3f0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLongTermDebtNoncurrent_cd9ffd20-c7ac-4654-b2e5-a82ad191a3ea" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_Liabilities_ffe37671-02e4-4661-bada-6b20762612c7" xlink:to="loc_us-gaap_OtherLongTermDebtNoncurrent_cd9ffd20-c7ac-4654-b2e5-a82ad191a3ea" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_3069b986-8bbc-4764-ba8e-79f049a76ae4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_ffe37671-02e4-4661-bada-6b20762612c7" xlink:to="loc_us-gaap_LiabilitiesCurrent_3069b986-8bbc-4764-ba8e-79f049a76ae4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_df79c366-8c64-4a54-9b47-009c413a152c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_Liabilities_ffe37671-02e4-4661-bada-6b20762612c7" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_df79c366-8c64-4a54-9b47-009c413a152c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_30b9ad92-f3f7-4067-9ce5-4302a1675c3b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Assets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_64658d08-8389-40e2-99b2-ae56198796dd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_30b9ad92-f3f7-4067-9ce5-4302a1675c3b" xlink:to="loc_us-gaap_AssetsCurrent_64658d08-8389-40e2-99b2-ae56198796dd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_f12e5166-9c6e-4df0-9c8d-8b7210fe45c1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_30b9ad92-f3f7-4067-9ce5-4302a1675c3b" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_f12e5166-9c6e-4df0-9c8d-8b7210fe45c1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_b4effeb0-9001-4367-95f8-b61db71bcb02" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Goodwill"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_30b9ad92-f3f7-4067-9ce5-4302a1675c3b" xlink:to="loc_us-gaap_Goodwill_b4effeb0-9001-4367-95f8-b61db71bcb02" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCostsAndOtherAssets_dd55814a-61e5-4649-9648-5d26b6f98800" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DeferredCostsAndOtherAssets"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_30b9ad92-f3f7-4067-9ce5-4302a1675c3b" xlink:to="loc_us-gaap_DeferredCostsAndOtherAssets_dd55814a-61e5-4649-9648-5d26b6f98800" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/ConsolidatedStatementsofOperations" xlink:type="simple" xlink:href="wlkp-20250630.xsd#ConsolidatedStatementsofOperations"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/ConsolidatedStatementsofOperations" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_636e2760-7a74-4b36-a8cf-bb0f81e10b47" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_8eef7578-ba11-4907-bcb7-722d0c51d51c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_636e2760-7a74-4b36-a8cf-bb0f81e10b47" xlink:to="loc_us-gaap_ProfitLoss_8eef7578-ba11-4907-bcb7-722d0c51d51c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_5fb0c060-063b-485b-a69b-10598708b7b5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_636e2760-7a74-4b36-a8cf-bb0f81e10b47" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_5fb0c060-063b-485b-a69b-10598708b7b5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_eb1d2775-0771-42e0-8da3-97b53c5a0492" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Revenues"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_16925831-0ac1-415f-98e6-7c930dd9262a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Revenues_eb1d2775-0771-42e0-8da3-97b53c5a0492" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_16925831-0ac1-415f-98e6-7c930dd9262a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_1015ab39-5141-4536-ad0c-ef8a968cb0e1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProfitLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_255764f2-d772-4c50-bd03-c7648bd26062" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_ProfitLoss_1015ab39-5141-4536-ad0c-ef8a968cb0e1" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_255764f2-d772-4c50-bd03-c7648bd26062" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_0026b458-d3bd-496c-a14a-892587ae93d5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_1015ab39-5141-4536-ad0c-ef8a968cb0e1" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_0026b458-d3bd-496c-a14a-892587ae93d5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_60f78b44-9ee7-4aa1-9f87-8965c367e0f3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GrossProfit"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_cac6f3b4-b224-459d-9f9e-d5f80e189392" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_GrossProfit_60f78b44-9ee7-4aa1-9f87-8965c367e0f3" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_cac6f3b4-b224-459d-9f9e-d5f80e189392" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_74de861b-c2bc-43f9-b2c3-7c2fb627519f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Revenues"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_60f78b44-9ee7-4aa1-9f87-8965c367e0f3" xlink:to="loc_us-gaap_Revenues_74de861b-c2bc-43f9-b2c3-7c2fb627519f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_92e79f9c-1923-4fe7-ae35-dba3d23f3df9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_c0bfddd7-9591-453a-9e0c-728cc375187f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_92e79f9c-1923-4fe7-ae35-dba3d23f3df9" xlink:to="loc_us-gaap_OperatingIncomeLoss_c0bfddd7-9591-453a-9e0c-728cc375187f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseNonoperating_a3860ccb-f469-4e60-acee-e9beb63b0b0f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_InterestExpenseNonoperating"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_92e79f9c-1923-4fe7-ae35-dba3d23f3df9" xlink:to="loc_us-gaap_InterestExpenseNonoperating_a3860ccb-f469-4e60-acee-e9beb63b0b0f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_8f98bc8a-a1f0-4583-ae3a-cda9005b228e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_92e79f9c-1923-4fe7-ae35-dba3d23f3df9" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_8f98bc8a-a1f0-4583-ae3a-cda9005b228e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_c0930bfb-3daa-4516-a37a-93ab7937f57a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_cbe15cb7-503d-457d-aa61-e8765d255f7e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GrossProfit"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_c0930bfb-3daa-4516-a37a-93ab7937f57a" xlink:to="loc_us-gaap_GrossProfit_cbe15cb7-503d-457d-aa61-e8765d255f7e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_62d2415c-24c4-4721-b0d8-5a983daefb2e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_c0930bfb-3daa-4516-a37a-93ab7937f57a" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_62d2415c-24c4-4721-b0d8-5a983daefb2e" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/ConsolidatedStatementsofCashFlows" xlink:type="simple" xlink:href="wlkp-20250630.xsd#ConsolidatedStatementsofCashFlows"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/ConsolidatedStatementsofCashFlows" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_4da344f0-afec-448f-a69f-735a9538dc8c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsMinorityInterest_b6d52b74-9db0-4562-8d4c-946962e6c226" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PaymentsOfDividendsMinorityInterest"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_4da344f0-afec-448f-a69f-735a9538dc8c" xlink:to="loc_us-gaap_PaymentsOfDividendsMinorityInterest_b6d52b74-9db0-4562-8d4c-946962e6c226" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid_4d8f4ccf-b5e2-470c-a84a-cfb444f966b2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_4da344f0-afec-448f-a69f-735a9538dc8c" xlink:to="loc_us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid_4d8f4ccf-b5e2-470c-a84a-cfb444f966b2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfRelatedPartyDebt_57da0803-c130-4e75-8dcb-ef2de995ae5f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RepaymentsOfRelatedPartyDebt"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_4da344f0-afec-448f-a69f-735a9538dc8c" xlink:to="loc_us-gaap_RepaymentsOfRelatedPartyDebt_57da0803-c130-4e75-8dcb-ef2de995ae5f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromRelatedPartyDebt_54b803be-75ab-4196-8255-946aad1503be" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProceedsFromRelatedPartyDebt"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_4da344f0-afec-448f-a69f-735a9538dc8c" xlink:to="loc_us-gaap_ProceedsFromRelatedPartyDebt_54b803be-75ab-4196-8255-946aad1503be" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_fe699c25-c504-4cbc-9082-cd3d697211ca" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_d59e8e14-e7a4-435c-bc44-2efd947109e1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_NetCashProvidedByUsedInOperatingActivities_fe699c25-c504-4cbc-9082-cd3d697211ca" xlink:to="loc_us-gaap_ProfitLoss_d59e8e14-e7a4-435c-bc44-2efd947109e1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_17f10a49-95c6-486c-bfe9-942037374774" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_fe699c25-c504-4cbc-9082-cd3d697211ca" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_17f10a49-95c6-486c-bfe9-942037374774" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnDispositionOfAssets_8df418ed-9945-4efb-8a78-f2105208978c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GainLossOnDispositionOfAssets"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_fe699c25-c504-4cbc-9082-cd3d697211ca" xlink:to="loc_us-gaap_GainLossOnDispositionOfAssets_8df418ed-9945-4efb-8a78-f2105208978c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables_b708a7d4-bdc2-4eb3-b3f8-9c5a1419aaa4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_fe699c25-c504-4cbc-9082-cd3d697211ca" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables_b708a7d4-bdc2-4eb3-b3f8-9c5a1419aaa4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_85b834da-5a5f-45a9-8061-cc325b84bc07" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncreaseDecreaseInInventories"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_fe699c25-c504-4cbc-9082-cd3d697211ca" xlink:to="loc_us-gaap_IncreaseDecreaseInInventories_85b834da-5a5f-45a9-8061-cc325b84bc07" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_80166100-194a-4c08-bea0-02dd03ff3d39" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_fe699c25-c504-4cbc-9082-cd3d697211ca" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_80166100-194a-4c08-bea0-02dd03ff3d39" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_14524143-e4a6-4e3e-a8f2-90eccc40437e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncreaseDecreaseInAccountsPayable"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_fe699c25-c504-4cbc-9082-cd3d697211ca" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayable_14524143-e4a6-4e3e-a8f2-90eccc40437e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_f7f24c66-60d2-441b-9cee-4ebaa4581124" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_fe699c25-c504-4cbc-9082-cd3d697211ca" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_f7f24c66-60d2-441b-9cee-4ebaa4581124" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_e1b18c47-16dd-457a-9a5e-b66b04578a3d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet"/>
    <link:calculationArc order="9" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_fe699c25-c504-4cbc-9082-cd3d697211ca" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_e1b18c47-16dd-457a-9a5e-b66b04578a3d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivableRelatedParties_60617964-bf10-4dcb-abc8-8f96d2dacc7e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncreaseDecreaseInAccountsReceivableRelatedParties"/>
    <link:calculationArc order="10" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_fe699c25-c504-4cbc-9082-cd3d697211ca" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivableRelatedParties_60617964-bf10-4dcb-abc8-8f96d2dacc7e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncashIncomeExpense_19584604-8c57-4b73-87de-a825a2093ec4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_NetCashProvidedByUsedInOperatingActivities_fe699c25-c504-4cbc-9082-cd3d697211ca" xlink:to="loc_us-gaap_OtherNoncashIncomeExpense_19584604-8c57-4b73-87de-a825a2093ec4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_fd18d88b-f6ec-4544-84b3-0828bb8250f8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_96555cf2-741e-456e-b7d5-6e7fbc9cfdde" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_fd18d88b-f6ec-4544-84b3-0828bb8250f8" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_96555cf2-741e-456e-b7d5-6e7fbc9cfdde" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_58565db4-c765-495e-8636-07d1801edfc0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_fd18d88b-f6ec-4544-84b3-0828bb8250f8" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_58565db4-c765-495e-8636-07d1801edfc0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_db636a6e-d878-4c44-a30a-c4ed4a82d2df" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.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_fd18d88b-f6ec-4544-84b3-0828bb8250f8" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_db636a6e-d878-4c44-a30a-c4ed4a82d2df" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_e52a25c5-5657-4104-b39a-921156cf0cb2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_wlkp_MaturitiesofinvestmentswithWestlakeundertheInvestmentManagementAgreement_140d6ff1-88a8-4cc1-90ff-d984ccf3b2ea" xlink:href="wlkp-20250630.xsd#wlkp_MaturitiesofinvestmentswithWestlakeundertheInvestmentManagementAgreement"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_e52a25c5-5657-4104-b39a-921156cf0cb2" xlink:to="loc_wlkp_MaturitiesofinvestmentswithWestlakeundertheInvestmentManagementAgreement_140d6ff1-88a8-4cc1-90ff-d984ccf3b2ea" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_a13cc048-8375-439f-b20b-745295fe9a6a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_e52a25c5-5657-4104-b39a-921156cf0cb2" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_a13cc048-8375-439f-b20b-745295fe9a6a" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/AccountsReceivableThirdPartiesScheduleOfAccountsReceivableDetails" xlink:type="simple" xlink:href="wlkp-20250630.xsd#AccountsReceivableThirdPartiesScheduleOfAccountsReceivableDetails"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/AccountsReceivableThirdPartiesScheduleOfAccountsReceivableDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesNetCurrent_780571b4-428a-43fd-b691-54677012a704" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ReceivablesNetCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableGrossCurrent_e1f925d8-4987-4da2-931c-a0f7b41311a3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccountsReceivableGrossCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ReceivablesNetCurrent_780571b4-428a-43fd-b691-54677012a704" xlink:to="loc_us-gaap_AccountsReceivableGrossCurrent_e1f925d8-4987-4da2-931c-a0f7b41311a3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_3c34697f-0b94-4efc-87b1-0ef6d7edadb2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ReceivablesNetCurrent_780571b4-428a-43fd-b691-54677012a704" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_3c34697f-0b94-4efc-87b1-0ef6d7edadb2" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/InventoriesDetails" xlink:type="simple" xlink:href="wlkp-20250630.xsd#InventoriesDetails"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/InventoriesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_e392df0e-6827-4af4-b176-d87a4f4a3c31" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_InventoryNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryFinishedGoods_ebaf0e7a-9253-4683-a54f-305e51002b4a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_InventoryFinishedGoods"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_e392df0e-6827-4af4-b176-d87a4f4a3c31" xlink:to="loc_us-gaap_InventoryFinishedGoods_ebaf0e7a-9253-4683-a54f-305e51002b4a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryWorkInProcessAndRawMaterials_0199110c-9829-4928-904a-15d0492f3821" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_InventoryWorkInProcessAndRawMaterials"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_e392df0e-6827-4af4-b176-d87a4f4a3c31" xlink:to="loc_us-gaap_InventoryWorkInProcessAndRawMaterials_0199110c-9829-4928-904a-15d0492f3821" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/SegmentInformationDetails" xlink:type="simple" xlink:href="wlkp-20250630.xsd#SegmentInformationDetails"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/SegmentInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_919fb9b3-6484-4e27-b007-1176aeed8c72" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:loc xlink:type="locator" xlink:label="loc_wlkp_RawMaterialEnergyManufacturingAndLogisticsCosts_653893df-b24b-4b0c-b348-4e1926df9dc2" xlink:href="wlkp-20250630.xsd#wlkp_RawMaterialEnergyManufacturingAndLogisticsCosts"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostOfGoodsAndServicesSold_919fb9b3-6484-4e27-b007-1176aeed8c72" xlink:to="loc_wlkp_RawMaterialEnergyManufacturingAndLogisticsCosts_653893df-b24b-4b0c-b348-4e1926df9dc2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_0d7b01c4-04af-4d37-b2bf-085c01eb6cec" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostOfGoodsAndServicesSold_919fb9b3-6484-4e27-b007-1176aeed8c72" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_0d7b01c4-04af-4d37-b2bf-085c01eb6cec" xlink:type="arc"/>
  </link:calculationLink>
</link:linkbase>
