Fuel Economy Unit Converter (MPG, L/100km, km/L)
Enter a fuel economy value and select the units you're converting from and to.
Fuel Economy Unit Converter (MPG, L/100km, km/L)
Convert fuel economy figures between MPG (US), liters per 100km and kilometers per liter — units that are not simply proportional to each other.
Different countries express fuel economy differently: the US uses miles per gallon, Europe uses liters per 100km, and some regions use kilometers per liter. Because MPG and L/100km are inversely related, converting between them needs more than a simple multiplier — this tool handles the math correctly.
Example
- With the default values shown above, this calculator returns: Equivalent (km/L) ≈ 12.754; Converted Value ≈ 7.840.
Frequently Asked Questions
Why isn't this a simple multiplication like other unit converters?
MPG and km/L measure distance per unit of fuel, while L/100km measures fuel per unit of distance — they're inversely related, so converting between them involves division, not just a fixed multiplier.
What conversion factor is used?
1 MPG (US) ≈ 0.425144 km/L. L/100km and km/L convert to each other as km/L = 100 ÷ (L/100km).