MPG to L/100km Converter
Convert miles per gallon to liters per 100 kilometers and km/L.
Results
Miles per gallon and liters per 100 kilometers are the two main ways to measure fuel economy around the world. The US and UK use MPG while most of Europe, Asia and Australia use L/100km. The conversion is not a simple multiply - it is an inverse relationship, so higher MPG means lower L/100km. This calculator handles the math for comparing fuel efficiency across systems.
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Frequently asked questions
Divide 235.215 by the MPG value. For example, 30 MPG = 235.215 / 30 = 7.84 L/100km. The constant 235.215 accounts for the gallon-to-liter and mile-to-kilometer conversions.
30 MPG is 7.84 L/100km. This is a fairly efficient fuel economy - typical of a modern compact car or small sedan.
MPG measures distance per fuel unit (higher is better) while L/100km measures fuel per distance (lower is better). They are inversely related, so you divide rather than multiply.
Yes, the UK imperial gallon is about 20% larger than the US gallon. A car rated at 30 US MPG would be about 36 UK MPG. This calculator uses US gallons.
Under 6 L/100km (over 39 MPG) is considered good. Most modern sedans achieve 6-8 L/100km. Hybrids can get under 4 L/100km and EVs are measured differently.