Trip Fuel Calculator
Enter your total driving distance and the vehicle’s consumption or fuel economy. Estimate the liquid fuel used on that journey, in litres or clearly distinguished gallons.
How to estimate trip fuel
- Enter the total distance in kilometres or miles. Include the return journey yourself if you want it counted.
- Enter the consumption or economy figure with the exact unit shown by the vehicle.
- Read the estimate, choose a result unit and copy or print a summary with its assumptions.
What the calculator does
- Two familiar inputs, without prices, vehicle presets or route lookup.
- Metric consumption, km/L and separately labelled U.S. and Imperial MPG.
- One primary volume, with equivalent volumes in the calculation details.
- Original measurements remain authoritative through untouched unit switches.
When it helps
- Plan a drive using a known distance and your own consumption figure.
- Combine a distance in miles with metric consumption, or kilometres with MPG.
- Explore how changing the entered consumption affects estimated fuel use.
Distance and fuel economy
Use road distance for the driving you intend to include. A straight-line distance can underestimate a winding route; the calculator does not find a route.
L/100 km is fuel per distance: multiply the kilometres by that figure and divide by 100. km/L and MPG are distance per fuel: divide the matching distance by the economy.
A U.S. liquid gallon and an Imperial gallon have different volumes. Choose the convention attached to your vehicle’s figure, regardless of the page language.
Worked examples
350 km at 7 L/100 km gives an estimated 24.5 litres, with no return distance or reserve added.
300 km at 15 km/L gives an estimated 20 litres. A higher km/L figure reduces fuel use for the same distance.
100 miles at 25 US MPG gives 4 U.S. gallons, about 15.14 litres. At 25 UK MPG it gives 4 Imperial gallons, about 18.18 litres.
Limits of the estimate
Estimate at a constant entered consumption. Actual usage can vary. This is not fuel to add to the tank, proof of sufficient usable fuel or a recommended reserve.
Only the total distance entered is included. No return journey or reserve is added.
Your inputs and privacy
Inputs stay in page memory. Copy and print run when requested; the website keeps its existing consent and analytics settings.
Questions about trip fuel
Sources and unit definitions
- nist.govNIST — Distance and volume conversionsInternational mile: 1.609344 km. Imperial gallon: 4.54609 litres.
- nist.govNIST — U.S. liquid gallon definitionA U.S. liquid gallon is 231 cubic inches. With an inch of 0.0254 m, this gives 3.785411784 litres.
- fueleconomy.govDOE / EPA — Why actual consumption variesDriving and vehicle conditions can change fuel use; published ratings do not guarantee your trip consumption.
Links checked on 4 October 2026. These references define units and explain variation; they do not establish a safe reserve.
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