Fuel & Stint Calculator

Turn your practice data into a race plan: fuel per stint, safe laps per tank, stint count and timing for any race distance. Works in litres or gallons.

  • Runs in your browser
  • Free · No sign-up
  • Margin-aware planning
Litres (or gallons, stay consistent). Enter consumption between 0.1 and 30.
Enter a tank size between 5 and 500.
Enter laps between 1 and 2000.
1–2% typical; 3–5% for unstable conditions.
Used for stint time estimates.
Race plan
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Fuel per stint
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Safe laps per tank
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Stints / stops
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Total fuel needed
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Est. stint time
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Est. race time
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Runs entirely in your browser. Nothing you enter is uploaded or stored.

How the fuel plan is calculated

fuel per lap (with margin) = practice fuel per lap × (1 + margin). safe laps per tank = floor(tank ÷ fueled-per-lap). stints = ceil(race laps ÷ safe laps per tank), then laps are spread evenly across stints (the last stint takes the remainder). Stint time is laps × your lap time; add pit-lane time separately if you are comparing strategies.

Formula walk-through with a worked example is on the methodology page.

Frequently asked questions

How do I find my fuel per lap?

Best method: run a full stint of practice laps in the car you will race (same fuel map, same driving style) and divide total fuel used by laps completed. Lap-time variation, drafting and lift-and-coast can change it by a few percent, which is why the calculator includes a safety margin.

What safety margin should I use?

A 1–2% margin is common for stable series; add more (3–5%) for variable conditions, traffic-heavy starts, or unfamiliar tracks. The margin protects against a slightly higher consumption on race day versus your practice average.

How do I convert this to stint count?

Divide race laps by your safe laps per tank (tank size ÷ per-lap consumption, minus any reserve). Round up for the number of stops, and the calculator shows a balanced plan: equal-length stints with the last stint adjusted.

Does this work for fuel-saving races?

Yes: lower the per-lap consumption figure to match your saving pace, and the stint calculation adapts. Note that fuel saving usually costs lap time; the stint time estimate uses your lap time input, so enter the pace you actually intend to run.

Which sims does this apply to?

Any sim where you know consumption per lap and tank capacity (litres or gallons): iRacing, ACC, Le Mans Ultimate, rFactor 2, AMS2, RaceRoom and the F1 games all fit. The maths is unit-agnostic: use litres or gallons consistently.