Fuel Economy Converter
Convert fuel economy between mpg (US and UK), kilometres per litre and litres per 100 km.
About the Fuel Economy Converter
The US and UK both use miles per gallon, but the UK gallon is about 20% larger, so the same car shows a higher mpg figure in the UK. India and much of Asia use km per litre; Europe, Canada and Australia use litres per 100 km.
The formula
L/100 km = 235.215 ÷ mpg (US), = 282.481 ÷ mpg (UK)
- km/L
- mpg (US) × 0.425144
- mpg (UK)
- mpg (US) × 1.20095
L/100 km measures fuel used per distance, so a lower number is better; mpg and km/L measure distance per fuel, so higher is better.
Common conversions
| From | To |
|---|---|
| 30 mpg (US) | 7.840486111 L/100 km |
| 30 mpg (US) | 12.75431122 km/L |
| 8 L/100 km | 29.40182292 mpg (US) |
| 50 mpg (UK) | 41.63370923 mpg (US) |
| 15 km/L | 6.666666667 L/100 km |
How to read your result
- Remember that L/100 km falls as efficiency improves.
Worked example
Example: 33 miles per us gallon = 7.127714646 L/100 km
- Inputs: Value: 33; From: Miles per US gallon (mpg (US)); To: Litres per 100 km (L/100 km).
- Formula: L/100 km = 235.215 ÷ mpg (US), = 282.481 ÷ mpg (UK)
- Result: 33 miles per us gallon = 7.127714646 L/100 km
Questions people ask
What is 30 mpg in L/100 km?
30 US mpg is about 7.84 L/100 km.
Why can't I just multiply?
L/100 km is an inverse measure, so it's 235.215 divided by US mpg, not a multiple of it.