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Fuel Economy
Miles per gallon (US) to Kilometers per liter
Convert miles per gallon (US) (mpg (US)) to kilometers per liter (km/L). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 mpg (US) = 0.425144 km/L
Miles per gallon (US) to Kilometers per liter Conversion Table
Common values, ready to copy:
| miles per gallon (US) | kilometers per liter |
|---|---|
| 1 mpg (US) | 0.425144 km/L |
| 2 mpg (US) | 0.850287 km/L |
| 5 mpg (US) | 2.1257 km/L |
| 10 mpg (US) | 4.2514 km/L |
| 25 mpg (US) | 10.6286 km/L |
| 50 mpg (US) | 21.2572 km/L |
| 100 mpg (US) | 42.5144 km/L |
| 1,000 mpg (US) | 425.14 km/L |
Formula
km/L = mpg(US) × 0.4251
Fuel economy can be expressed as distance per unit fuel (mpg, km/L, higher is better) or fuel per unit distance (L/100km, lower is better). They convert via inverse: mpg(US) × L/100km = 235.2146.
About Miles per gallon (US) and Kilometers per liter
Miles per gallon (US) (mpg (US)): Distance per US gallon of fuel; the US standard for fuel economy. Common uses: US vehicle window stickers (EPA-rated mpg), US car reviews, and US fleet fuel economy.
Kilometers per liter (km/L): Inverse of L/100km — distance traveled per fuel volume; less common than L/100km but used in some Asian markets. Common uses: Vehicle fuel economy in Japan, India, and several other Asian markets; conceptually similar to mpg but in metric units.
How the conversion works
Fuel economy can be expressed as distance per unit fuel (mpg, km/L, higher is better) or fuel per unit distance (L/100km, lower is better). They convert via inverse: mpg(US) × L/100km = 235.2146.
The exact relationship is km/L = mpg(US) × 0.4251, which the calculator at the top of this page applies in both directions. Type into either field and the other updates immediately.
When this conversion matters
Converting between miles per gallon (US) and kilometers per liter comes up wherever fuel economy measurements move between systems — from one country's conventions to another's, from a scientific reference to a practical specification, or from one industry's working unit to another's. The calculator and reference table above cover the everyday range; for unusual values you can type any number into either field.