Free Tool

Slow Steaming Calculator

Every knot slower burns roughly speed³ less fuel — see days, tonnes, CO₂ and cost across the speed range on a real route.

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

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Profile name

FromToRouting optionReference speed (kn)Consumption at that speed (mt/day)Fuel price (USD/mt)Speed–power exponent

SingaporeRotterdam8,368 nm · sea-route estimate

SpeedDaysmt/dayFuel (mt)CO₂ (t)Fuel cost

8 kn43.65.6244760$146,379

10 kn34.910.93811187$228,717

11 kn31.714.64611436$276,748

12 kn29.118.95491709$329,353

13 kn26.824.06442006$386,532

14 kn (ref)24.930.07472327$448,286

15 kn23.236.98582671$514,614

16 kn21.844.89763039$585,516

18 kn19.463.812353846$741,044

20 kn17.487.515254748$914,869

At 10 kn vs 14 kn: saves 366 mt fuel ($219,569), adds 10.0 days. Consumption ∝ speed^3 — the admiralty-coefficient relation for displacement hulls; exponent adjustable for your engine data.

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Method

Admiralty-coefficient scaling.

Speed³

Consumption scales with speed³ for displacement hulls — the standard admiralty-coefficient relation. Adjust the exponent for your engine curve.

Real distance

Sea-route nm over the maritime network — not a straight line — so fuel and days are route-realistic.

Decision support

Compare the fuel saved against the extra days at daily hire — the trade chartering desks actually make.

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The voyage estimator folds fuel into the full P&L with TCE and break-even.

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