Fuel Economy Converter
Convert between MPG, L/100km, km/L, and other fuel economy units for cars and vehicles.
About this calculator
Fuel economy is quoted in km/L in India, L/100 km in Europe, and miles per gallon in the US and UK. The US and UK gallons are different sizes, so 30 mpg means different things in each country.
This converter handles mpg (US), mpg (UK), L/100 km, km/L and miles per litre. L/100 km is the inverse of km/L, so higher km/L means lower L/100 km, which the tool handles correctly.
How to use it
- Type the Value.
- Choose the From and To units.
- Read the result and the table of all five units.
Method
Everything goes through km/L. 1 mpg (US) = 0.425144 km/L, 1 mpg (UK) = 0.354006 km/L, 1 mi/L = 1.609344 km/L and L/100 km = 100 ÷ km/L.
Worked example
Examples
| 15 km/L | 6.67 L/100 km, 35.28 mpg (US), 42.37 mpg (UK) |
| 30 mpg (US) | 12.754 km/L, 7.84 L/100 km |
| 8 L/100 km | 12.5 km/L |
| 1 km/L | 2.352 mpg (US) |
Tips and common mistakes
- Check which gallon a mileage figure uses.
- Lower L/100 km is better; higher km/L and mpg are better.
- Real-world mileage is 10 to 25% below brochure figures.
- City, highway and AC use change results.
- Keep tyres inflated to protect fuel economy.
Frequently asked questions
How do I convert mpg to km/L?
Multiply US mpg by 0.425144.
How do I convert km/L to L/100 km?
Divide 100 by km/L.
Why are US and UK mpg different?
The UK gallon is 20% larger.
What is a good mileage for a car in India?
15 to 20 km/L for petrol hatchbacks is typical.
What is 10 km/L in L/100 km?
10.
What is 40 mpg in km/L?
About 17 km/L (US mpg).