Fuel Economy Converter
Convert fuel economy instantly between MPG (US), MPG (UK/Imperial), L/100km, and km/L. Free, fast, and private.
All equivalents
Common Fuel Economy Reference Values
| MPG (US) | MPG (UK) | L/100km | km/L | Typical Vehicle |
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About Fuel Economy Converter
Quickly convert fuel economy figures between the four most common units: miles per gallon (US), miles per gallon (UK/Imperial), liters per 100 kilometers, and kilometers per liter. All calculations use standard conversion factors and run entirely in your browser.
4 Fuel Economy Units
Covers MPG (US gallon), MPG (Imperial), L/100km, and km/L. All the fuel efficiency units used worldwide.
Standard Factors
Uses internationally accepted conversion factors. 1 US gallon = 3.78541 L, 1 Imperial gallon = 4.54609 L.
Instant Results
All four equivalents update in real time as you type. No submit button needed.
Reference Table
Common fuel economy benchmarks included so you can quickly compare vehicle efficiency ratings across unit systems.
How It Works
- Enter a value — Type the fuel economy number you want to convert.
- Pick source unit — Select whether your input is MPG (US), MPG (UK), L/100km, or km/L.
- Read all equivalents — The converted values in all four units appear instantly in the results grid, along with the conversion formula.