Fuel Economy Converter
Convert between MPG (US or UK), liters per 100 km, and kilometers per liter — the three ways the world measures the same thing.
Quick reference
| US mpg | L/100km | km/L | Typical of… |
|---|---|---|---|
| 20 | 11.8 | 8.5 | Large SUV / pickup |
| 30 | 7.8 | 12.8 | Average sedan |
| 40 | 5.9 | 17.0 | Efficient compact |
| 50 | 4.7 | 21.3 | Hybrid |
Frequently asked questions
Why do MPG and L/100km move in opposite directions?
MPG measures distance per fuel (higher is better) while L/100km measures fuel per distance (lower is better). They're reciprocals: L/100km = 235.21 ÷ US mpg.
Is UK MPG different from US MPG?
Yes — the imperial gallon (4.546 L) is 20% bigger than the US gallon (3.785 L), so the same car scores about 20% more MPG in UK figures. 40 mpg UK ≈ 33 mpg US.
Which countries use which unit?
The US uses US mpg, the UK quotes imperial mpg (though fuel is sold in liters), most of Europe uses L/100km, and Japan, India and much of Asia and Latin America use km/L.
Last updated: 2026-07-13