Race Fuel Calculator

Base fuel equals laps times fuel per lap. Total fuel multiplies that by one plus the safety margin percent over 100, so a 5 percent margin on 125 litres gives 131.25 litres.

Laps per stint is the tank capacity divided by fuel per lap, rounded down to a whole lap, since you cannot start a lap you are not sure of finishing. An 80 litre tank at 2.5 litres per lap gives 32 laps.

The tool divides total laps by laps per stint, rounds up to whole stints, then subtracts one, because every stint after the first needs a stop to refuel. Fifty laps in 32-lap stints is two stints, so one stop.

Then laps per stint is at least the race length, the stint count is one, and pit stops read zero. The tool never returns a negative stop count.

No. Tank capacity is optional. Leave it blank and you still get base and total fuel, but the laps per stint and pit stop cards show 'Add tank' until you provide it.

Five percent is a common buffer for a formation lap, safety cars and traffic. Raise it for wet or chaotic races, and only trim it when the tank is tight and your pace and burn are well known.

Yes. It uses one fuel-per-lap figure, so it does not model a heavy car burning more on early laps or a fuel-save lift-and-coast. Enter a slightly higher per-lap number to stay on the safe side.

The tool works in litres throughout, for fuel per lap, tank size and both fuel totals. If your data is in gallons, convert it first or read every figure as your own consistent unit.

Yes. All the maths runs in your browser and nothing is uploaded, so your fuel numbers and pit plan never leave your device.