Fuel Economy Converter
Enter a fuel economy value and choose a starting unit to convert between MPG (US) and L/100km.
Last updated: September 5, 2026
Frequently asked questions
How do I convert MPG to L/100km?
Divide 235.214 by the MPG value. A car getting 25 MPG uses about 9.41 L/100km - the relationship is inverse, so higher MPG means lower L/100km.
Why is the MPG to L/100km conversion not a simple multiplication?
MPG measures distance per unit of fuel, while L/100km measures fuel per unit of distance - they're reciprocals of each other, so the conversion involves division rather than a fixed multiplier.
Why does a higher MPG number mean a lower L/100km number?
MPG measures distance per unit of fuel (higher is better), while L/100km measures fuel per unit of distance (lower is better) - they're inverse measurements, so the relationship between them isn't linear, which is also why the conversion isn't a simple multiplication.
Why do European cars advertise fuel consumption instead of fuel economy?
Most of the world measures fuel consumption as liters per 100 km (how much fuel is used over a fixed distance), while the US measures fuel economy as miles per gallon (how far you go per unit of fuel) - the two scales aren't linearly related, which is why this converter is needed rather than a simple ratio.
What is 9.41 L/100km in MPG?
About 25 MPG - divide 235.214 by the L/100km value (235.214 ÷ 9.41 ≈ 25), the same inverse relationship used to go from MPG to L/100km.
Is 'MPG (US)' the same as 'MPG (UK/Imperial)'?
No - a US gallon (3.785 liters) is smaller than an imperial gallon (4.546 liters), so the same fuel efficiency in real-world terms produces a different MPG number depending on which gallon is used. This calculator uses US MPG; converting from imperial MPG requires an extra gallon-size adjustment first.
What L/100km rating counts as fuel-efficient for a typical car?
Roughly 6-8 L/100km (about 29-39 MPG) is typical for an efficient gas-powered sedan, with hybrids often reaching 4-5 L/100km (47-59 MPG) and larger SUVs or trucks commonly landing at 10-14 L/100km (17-24 MPG).