Miles per US gallon to kilometers per liter converter
Convert Miles per US gallon (US mpg) to kilometers per liter (km/L). Calculate a value, check the formula and compare common measurements.
Result for the values shown.
Calculations run in your browser.
What to enter
| Input | Meaning and units |
|---|---|
| Value | Enter value using the definition in the method and example. |
| From | Select the unit or currency in which the entered number is currently expressed. |
| To | Select the unit or currency you need for the answer. |
Understanding your result
The converted value describes the same fuel economy quantity in the selected target unit. Display rounding does not add precision to the original measurement.
Common mistakes
- Treating consumption and economy as a linear multiplier, or mixing US and imperial gallons.
Check your calculation
- Convert to the target unit and then reverse the direction. Within display rounding, you should recover the original value.
Read the fuel economy measurement guide · Calculation checks, sources and review limits
How do I convert miles per US gallon to kilometers per liter?
Enter the value in miles per US gallon to find the same fuel economy quantity in kilometers per liter. The number changes to match the unit; the underlying quantity stays the same. Check the definitions below when a unit has more than one convention.
Common uses
- Compare fuel consumption and distance-per-volume figures.
- Translate between US and imperial fuel-economy conventions.
How it works
For the displayed direction, 1 US mpg equals 0.42514370743 km/L. The engine converts through the shared fuel economy base quantity. Fuel consumption and economy are reciprocal. US and imperial gallons differ; inputs must be positive. Use the scale-specific transformation, rather than multiplying by a constant. Keep full precision until the final result; displayed answers use up to 12 significant digits.
Worked example
10 US mpg converts to 4.2514370743 km/L. For the reverse direction, swap the units and enter 4.2514370743 km/L; the result is approximately 10 US mpg.
FAQ
How do I convert US mpg to km/L?
target = reciprocal conversion via litres per 100 kilometres
Which definition is used?
Fuel consumption and economy are reciprocal. US and imperial gallons differ; inputs must be positive.
Common values
Use “Swap units” above for the reverse conversion. Values below are rounded to six significant digits.
| Miles per US gallon | kilometers per liter |
|---|---|
| 1 | 0.425144 |
| 5 | 2.12572 |
| 10 | 4.25144 |
| 20 | 8.50287 |
| 30 | 12.7543 |
| 50 | 21.2572 |
| 100 | 42.5144 |