Fuel Economy Converter
Convert car mileage between miles per gallon (US), miles per gallon (UK), liters per 100 kilometers and kilometers per liter (kmpl). These units are inverses of each other, so the conversion divides a constant by the value rather than multiplying: L/100 km = 235.215 ÷ mpg (US).
1 miles per gallon (us) = 235.21458 L/100 km. Formula: L/100km = 235.21458 ÷ mpg
1 miles per gallon (us) in all fuel economy units
| L/100 km (L/100km) | 235.21458 |
| Km/L (km/L) | 0.42514371 |
| Mpg (UK) (mpg (UK)) | 1.2009499 |
Fuel economy units on this page
| Unit | Symbol | 1 unit equals |
|---|---|---|
| Liters per 100 km | L/100km | 1 L/100km |
| Kilometers per liter | km/L | 100 ÷ value, in L/100km |
| Miles per gallon (US) | mpg | 235.21458 ÷ value, in L/100km |
| Miles per gallon (UK) | mpg (UK) | 282.48094 ÷ value, in L/100km |
To convert, the value is first expressed in the base unit and then divided by the factor of the target unit, so any pair of units on this page can be converted in one step.
Common fuel economy conversions
| From | To |
|---|---|
| 30 mpg (US) | 7.8404861 L/100km |
| 10 L/100 km | 23.521458 mpg |
| 15 km/L | 6.6666667 L/100km |
| 40 mpg (UK) | 7.0620234 L/100km |
| 5 L/100 km | 20 km/L |
| 30 mpg (US) | 12.754311 km/L |
| 25 mpg (US) | 30.023748 mpg (UK) |
Higher is better, or lower is better
Mpg and km/L rise as a car gets more efficient. L/100 km falls. That makes comparisons across regions confusing: a 40 mpg (US) car uses 5.88 L/100 km, which is 17 km/L, and 48 mpg (UK) because the imperial gallon is 20% larger. Electric cars use a different measure entirely (kWh per 100 km or miles per kWh), and hybrids' official figures depend heavily on the test cycle, so treat published numbers as comparable within one region only.
Frequently asked questions
How do I convert mpg to L/100km?
Divide 235.215 by the US mpg figure (or 282.481 by a UK mpg figure). 30 mpg (US) is 7.84 L/100 km.
What is kmpl in mpg?
Multiply km/L by 2.35215 for US mpg or by 2.82481 for UK mpg. 15 kmpl is 35.3 mpg (US) or 42.4 mpg (UK).
Why are UK mpg figures higher than US ones for the same car?
The imperial gallon is 4.546 liters against 3.785 for the US gallon, so the same car travels 20% further per UK gallon. 40 mpg (US) is 48 mpg (UK).
What is a good fuel economy?
For a petrol car, under 6 L/100 km (over 39 mpg US, over 16 km/L) is efficient; over 10 L/100 km (under 24 mpg US) is thirsty. Diesel and hybrid cars generally do better.
Related calculators
Last updated . Formulas are shown on the page and checked against the worked example.
Conversion factors are exact international definitions where one exists and standard reference values elsewhere. Results are rounded to 8 significant digits.