Fuel economy converter
Convert fuel economy between mpg (US or UK), L/100 km and km/L.
30 Miles per US gallon ≈ 7.840486111 Litres per 100 km
Exact factorRounded for display to about 10 significant digits.
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About these units
Fuel economy says how far a vehicle goes on a given amount of fuel; fuel consumption says how much fuel it uses over a given distance. The United States and the United Kingdom use miles per gallon, but with different gallons: UK mpg figures are about 20% higher for the same car.
Europe and most other countries use litres per 100 kilometres, where a lower number is better. Because one figure is distance per fuel and the other fuel per distance, the conversion is an inverse: divide, do not multiply.
Popular conversions
- Miles per US gallon to Litres per 100 km
- Litres per 100 km to Miles per US gallon
- Miles per UK gallon to Litres per 100 km
- Litres per 100 km to Miles per UK gallon
- Miles per US gallon to Kilometres per litre
- Kilometres per litre to Miles per US gallon
- Kilometres per litre to Litres per 100 km
- Litres per 100 km to Kilometres per litre
- Miles per US gallon to Miles per UK gallon
- Miles per UK gallon to Miles per US gallon
- Miles per UK gallon to Kilometres per litre
- Kilometres per litre to Miles per UK gallon
- Miles per US gallon to US gallons per 100 miles
- US gallons per 100 miles to Litres per 100 km
Questions people ask
How do I convert mpg to L/100 km?
For US mpg, divide 235.2145833 by the mpg. For UK mpg, divide 282.4809363 by the mpg.
What is 30 mpg in L/100 km?
30 US mpg is about 7.84 L/100 km; 30 UK mpg is about 9.42 L/100 km.
Why are UK mpg figures higher than US ones?
The imperial gallon (4.54609 L) is larger than the US gallon (3.785411784 L), so a car covers more miles per UK gallon.
Factors checked 19 October 2026.