About the Fuel Economy Converter
Convert between L/100km, km/L, US MPG and UK MPG in one step.
Also known as: mpg to l/100km, l/100km to mpg, km/l to mpg, fuel efficiency converter.
How to use this calculator
- Enter value, unit.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
L/100km = 100 ÷ km per litre · 1 US MPG = 0.4251 km/L
Worked example
Using the values pre-filled in the calculator above:
- Value = 8
- Unit: Litres per 100 km
the calculator returns:
- Litres per 100 km: 8
- Kilometres per litre: 12.5
- MPG (US): 29.4
- MPG (imperial): 35.31