Unit Converters
Fuel Economy Converter
Convert between MPG, km/L, and L/100km.
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About the Fuel Economy Converter
Convert fuel economy free between US MPG, UK MPG, km/L, and L/100km — the tricky inverse conversion done correctly (30 US MPG ≈ 7.84 L/100km). Perfect for comparing car specs across countries, renting a car abroad, or translating a European L/100km rating into the MPG number you're used to.
How to use the Fuel Economy Converter
- 01Enter a value.
- 02Pick the unit to convert from.
- 03Read every other unit.
Frequently asked questions
Why isn't this a simple multiplication?
L/100km is an inverse measure (fuel per distance), so converting to/from MPG requires a reciprocal, not a constant factor.
Is US MPG the same as UK MPG?
No — the UK gallon is larger, so UK MPG figures are higher for the same efficiency.
What is good fuel economy?
Around 30+ US MPG (under ~8 L/100km) is solid for a gas car; hybrids commonly reach 50+ MPG (under 5 L/100km).