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Marine & Boating Calculators

Fuel Range Calculator

How far you can travel on the fuel aboard, with a safe reserve held back.

Also known as range on fuel, boat fuel range, endurance calculator.

Enter values

Results update as you type.

Result

Safe range

100 nm

The old rule of thirds: a third out, a third back, a third in reserve.

In kilometres
185.2
Endurance
12.5 hours
Usable fuel
150 litres
Reserve held back
50 litres
Fuel per nautical mile
1.5 L/nm
Maximum range on all fuel
133.3 nm

About the Fuel Range Calculator

How far you can travel on the fuel aboard, with a safe reserve held back.

Also known as: range on fuel, boat fuel range, endurance calculator, how far on a tank.

How to use this calculator

  1. Enter fuel aboard, fuel burn, cruising speed, reserve to keep.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Fuel Range formula

range = usable fuel ÷ burn rate × speed

Worked example

Using the values pre-filled in the calculator above:

  • Fuel aboard = 200 litres
  • Fuel burn = 12 L/hour
  • Cruising speed = 8 knots
  • Reserve to keep = 25 %

the calculator returns:

  • Safe range: 100 nm
  • In kilometres: 185.2
  • Endurance: 12.5 hours
  • Usable fuel: 150 litres