Bunker Quantity & Bunker Survey Calculator

Bunker Quantity • VCF / CTL • Density @15°C • Weight in Air • Tank Gain • MFM • BDN • Shortage Exposure

Bunker Quantity & Bunker Survey Calculator

Convert observed bunker volume to standard volume and commercial tonnes, compare surveyed quantity with the Bunker Delivery Note, and quantify any variance. Simple mode handles one received parcel quickly. Advanced adds tank-by-tank before/after gauging, individual temperatures and densities, manual VCF overrides, free-water deductions, operational adjustments, MFM and supplier-outturn cross-checks, sensitivity analysis and survey-readiness diagnostics.

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Need much more depth? Click Advanced above.Advanced adds before/after tank states, multiple receiving tanks, separate densities and temperatures, free-water changes, manual VCF entry, MFM and supplier outturn comparison, operational consumption/transfer adjustments, readiness checks and sensitivity diagnostics.

Fast7 primary inputs

Core answerSurveyed MT vs BDN

TransparentVCF and air-weight math shown

Fast Bunker Quantity Screen

Enter the received observed volume after using the vessel’s approved tank calibration and trim/list corrections. Simple mode applies an ISO 91 / API MPMS generalized-products VCF screening calculation and converts density in vacuum to commercial weight in air.

Fuel grade

Observed volume receivedm³, already corrected from approved tank tables.

Mean observed fuel temperature°C.

Free water deductionm³ of separate free water within the observed quantity.

Density at 15°C in vacuumkg/m³. Use the agreed BDN/lab basis.

BDN stated quantitymetric tonnes.

Fuel priceselected currency / tonne.

Survey & Reconciliation Basis

Fuel grade

Primary survey basis

VCF / CTL method

Commercial comparison basis

BDN stated quantitymetric tonnes.

Fuel price

MFM metered quantityoptional metric tonnes on the selected comparison basis.

Supplier / barge outturnoptional metric tonnes.

Receiving Tank Register

Enter tank volumes already obtained from the vessel’s approved calibration tables with trim/list correction applied. Before and after states are corrected separately because temperature and density may differ. In Auto mode the VCF fields are calculated and locked; switch to Manual VCF to enter approved factors directly.

Tank type	Capacity m³	Before GOV	Before FW	Before °C	Before ρ15	Before VCF	After GOV	After FW	After °C	After ρ15	After VCF

Operational Quantity Adjustments

These adjustments reconcile measured tank gain to delivered quantity. Keep them at zero when no such movements occurred.

Consumption / transfers out to add backt consumed or removed from measured tanks during bunkering.

Transfers / other receipts into tanks to deductt added from another source besides the bunker delivery.

Survey Readiness

Tank calibration / trim-list corrections verifiedObserved volumes come from approved vessel tables. Before and after temperatures recordedRepresentative tank temperatures used for each state. Free water checkedInterface / free-water condition documented where applicable. Density basis verifiedBDN / laboratory density source and units confirmed. Valve / line-up and internal transfers controlledUnintended transfers are excluded or adjusted. Consumption during operation accountedME/AE/boiler consumption is included where material. BDN / metering documents reviewedQuantity basis and metering ticket checked where applicable. Sampling and seals documentedRepresentative sample and seal records handled separately.

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Measurement limitation: this calculator does not replace the locally required custody-transfer method, a certified mass-flow-meter system, approved tank calibration tables, joint gauging, or an independent bunker quantity survey. Quantity disputes depend on the full contemporaneous record. For a commercial claim, verify VCF/CTL with approved measurement tables or software and follow the applicable contract, port rules and survey procedure.

Current methodology context: ISO 13739:2020 remains the current international bunker-transfer procedure standard and covers pre-delivery, delivery, quantity measurement and post-delivery documentation. ISO 91:2017 remains current for petroleum temperature/pressure volume correction factors and standard reference conditions. MARPOL Annex VI regulation 18 / appendix V requires BDN quantity in metric tonnes and density at 15°C, with BDN and representative-sample retention requirements. In Singapore, SS 648:2024 has applied to MFM custody transfer since 1 April 2025; SS 600:2022 remains relevant for tank-gauging procedures where permitted. Local rules and the agreed custody-transfer method always control.

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