Fuel Economy Converter
Convert MPG, L/100km and km/L instantly. Calculate cost per 100km.
Enter a value in any field — all others update automatically.
Cost calculator
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Frequently asked questions
What is the difference between US and UK MPG?
The US gallon is 3.785 litres while the UK (Imperial) gallon is 4.546 litres. A car rated at 30 MPG (US) is equivalent to about 36 MPG (UK) — the same car, just a different gallon size.
How do I convert L/100km to MPG?
MPG (US) = 235.21 ÷ L/100km. For example, 8 L/100km = 235.21 ÷ 8 = 29.4 MPG (US).
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