Conversion Formula
1 mpg (US) = 0.425144 km/L · 1 mpg (UK) = 0.354006 km/L · km/L × L/100km = 100
Common Fuel Economy Converter Reference
| From | Equals | Also |
|---|
| 30 mpg (US) | 12.7543 km/L | 7.84055 L/100km |
| 30 mpg (UK) | 10.6202 km/L | 9.41604 L/100km |
| 10 L/100km | 10 km/L | 23.5215 mpg (US) |
| 7 L/100km | 14.2857 km/L | 33.6021 mpg (US) |
| 50 mpg (US) | 21.2572 km/L | 4.70433 L/100km |
| 5 L/100km | 20 km/L | 47.0430 mpg (US) |
How to Convert Fuel Economy
- Enter the value you want to convert.
- Choose the From unit.
- Choose the To unit.
- Click Convert to see the result instantly.
Frequently Asked Questions
How do I convert mpg to km/L?+
Multiply US mpg by 0.425144 to get km/L. For UK mpg, multiply by 0.354006.
How do I convert L/100km to mpg?+
mpg (US) = 235.215 ÷ L/100km. Example: 8 L/100km = 29.4 mpg (US).
Why is mpg different in US and UK?+
A US gallon = 3.785 L; a UK gallon = 4.546 L. The UK gallon is about 20% larger, so UK mpg is higher for the same fuel economy.
What is good fuel economy?+
Above 40 mpg (US) or below 6 L/100km is excellent for petrol cars. Hybrids often achieve 50+ mpg.
How do I convert km/L to L/100km?+
100 ÷ km/L = L/100km. Example: 20 km/L = 5 L/100km.
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