Enter the distance driven and fuel used to get your fuel economy in MPG, km/L and L/100km.
How this calculator arrives at its answer
This calculator works out your real-world fuel economy from a full tank. Enter how far you drove and how much fuel you used, in your choice of units.
Track it over time to spot changes in your car’s efficiency.
A worked example
As an example, with a distance driven of 300, fuel used of 10, the calculator returns a fuel economy of 30. Underneath, L / 100 km comes out at 7.84 and km / L at 12.75. Change any field and every figure updates as you type.
Getting your answer
- Enter the distance driven and its unit.
- Enter the fuel used and its unit.
- Read MPG, km/L and L/100km.
How the number is calculated
MPG = miles ÷ gallons
L/100km = litres ÷ km × 100
Common questions
How do I calculate MPG?
Divide the miles driven by the gallons of fuel used to refill. Fill up, reset the trip meter, and refill to measure a tank.
What’s a good fuel economy?
It varies widely by vehicle. Higher MPG (or km/L) and lower L/100km mean better efficiency.
How is L/100km different?
It measures fuel per fixed distance, so lower is better — the opposite direction to MPG.