Fuel Economy Converter (MPG ⇄ L/100 km)
Fuel economy converter: miles per gallon (US) to liters per 100 km and back, plus km per liter and UK mpg.
L/100 km = 235.215MPG
How to use this calculator
- Choose the quantity you want under “Solve for”.
- Type the known values and pick their units: any combination works.
- The result updates as you type. Open “Show the steps” to see the substitution.
MPG and L/100 km are reciprocal: a higher MPG means a lower L/100 km. L/100 km = 235.215 ÷ MPG (US gallons).
UK figures use the larger imperial gallon, so the same car shows about 20 % more mpg in the UK than in the US.
Formula
L/100 km = 235.215MPG
| Symbol | Quantity | Units |
|---|---|---|
| MPG | Miles per US gallon | — |
| L/100 km | Liters per 100 km | — |
Worked example
Given: MPG = 30
L/100 km = 235.215MPG
Result: L/100 km = 7.84049
Frequently asked questions
What is 30 mpg in L/100 km?
235.215 ÷ 30 = 7.84 L/100 km.
Why can’t I just multiply by a factor?
Because one unit is distance per fuel and the other fuel per distance; the conversion is a reciprocal.