Free Tool

Bunker Quantity Calculator

Sounding volume → corrected tonnes via density and temperature — plus the propeller-slip figure officers report daily.

ILLUSTRATIVE TELEMETRY · NOT LIVE DATALAT 51.9244°NLON 4.4777°ESOG 12.4 KNHDG 087°TWS 18 KT NWSWELL 2.1 MSIG −38 DBNO LIVE AIS FEEDECDIS NOT CONNECTEDUTC --:--:--ILLUSTRATIVE TELEMETRY · NOT LIVE DATALAT 51.9244°NLON 4.4777°ESOG 12.4 KNHDG 087°TWS 18 KT NWSWELL 2.1 MSIG −38 DBNO LIVE AIS FEEDECDIS NOT CONNECTEDILLUSTRATIVE TELEMETRY · NOT LIVE DATALAT 51.9244°NLON 4.4777°ESOG 12.4 KNHDG 087°TWS 18 KT NWSWELL 2.1 MSIG −38 DBNO LIVE AIS FEEDECDIS NOT CONNECTEDUTC --:--:--ILLUSTRATIVE TELEMETRY · NOT LIVE DATALAT 51.9244°NLON 4.4777°ESOG 12.4 KNHDG 087°TWS 18 KT NWSWELL 2.1 MSIG −38 DBNO LIVE AIS FEEDECDIS NOT CONNECTED

Bunker quantity — volume correction

Observed volume (m³)Density at 15 °C (kg/m³)Observed temperature (°C)

1171.67 tquantity (in vacuum basis)

1170.37 tweight in air (ρ−1.1)

0.98526indicative VCF

Indicative volume-correction factor — a simplified approximation of ASTM Table 54B for typical residual/distillate fuels. Official bunker surveys use the printed tables; treat this as a cross-check.

Propeller slip

Engine distance (nm)Observed distance (nm)

4.23%propeller slip

Slip = (engine distance − observed)/engine distance — the daily noon-figure officers report. Sustained positive slip points to fouling or weather debit.

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Method

Density correction, stated limits.

VCF

Simplified ASTM Table 54B-style correction — warm fuel occupies more volume, so tonnes shrink. Indicative cross-check only.

Weight in air

Weight-in-air basis (ρ−1.1 kg/m³) shown alongside the vacuum-basis figure — the convention matters in disputes.

Slip

(Engine − observed)/engine distance — sustained positive slip flags fouling or weather debit.

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