Fuel Economy Converter
Convert fuel economy between km per litre, litres per 100 km and miles per US or UK gallon. Note that litres per 100 km goes down as economy gets better.
- Kilometres per litre
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- Litres per 100 km
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- Miles per US gallon
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- Miles per UK gallon
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How it is calculated
- Everything is converted through km per litre.
- L/100 km = 100 ÷ km/L
- mpg (US) = km/L × 3.785411784 ÷ 1.609344; mpg (UK) = km/L × 4.54609 ÷ 1.609344
Worked example
| You enter | |
|---|---|
| Value | 12 |
| From | km/L |
| You get | |
| Kilometres per litre | 12 km/L |
| Litres per 100 km | 8.3333 L/100 km |
| Miles per US gallon | 28.2258 mpg |
| Miles per UK gallon | 33.8977 mpg |
12 km/L equals 12 km/L, 8.3333 L/100 km, 28.2258 mpg (US) and 33.8977 mpg (UK).
Sources and checks
Last checked: 15 October 2026. This calculator passes 4 automatic tests before every release.
Your numbers never leave your device: the calculation runs in your browser and nothing you type is sent or stored.
Conversions use exact legal definitions. Results are rounded for display. Results are estimates for information only and are not financial, tax or legal advice. Check important figures with a qualified professional before you act on them.