Convert accurately between kilometers per liter, liters per 100 kilometers, U.S. mpg and imperial mpg, with the two gallon definitions kept clearly separate.
Example: a car gets 30 U.S. mpg. How many liters per 100 km does it use?
Result7.840486 L/100 km 30 mpg (US) = 7.840486 L/100 km
One-unit equivalent1 mpg (US) = 235.214583 L/100 km Note: lower L/100 km is better, while higher mpg or km/L is better.
✓ Conversions use NIST definitions for the mile and U.S. gallon, plus the legal imperial-gallon definition
How is the conversion calculated?Units are normalized internally to kilometers per liter. Conversions to or from L/100 km use a reciprocal relationship, so this is not just multiplication by a fixed factor.
This calculation runs in your browser. Your values are not sent to our server.
Enter a fuel-economy or fuel-consumption value, then choose the current and target units.
Example: 30 U.S. mpg is approximately 7.840486 L/100 km.
The tool uses the defined international mile, U.S. liquid gallon and imperial gallon instead of treating the two gallons as interchangeable.
Conversions to or from L/100 km are reciprocal: lower L/100 km is better, while higher mpg or km/L is better.
Zero and negative values are rejected because the reciprocal conversion at zero does not produce a useful finite value.
FAQ
How many L/100 km is 30 U.S. mpg?
30 U.S. mpg is approximately 7.840486 L/100 km.
Is U.S. mpg the same as imperial mpg?
No. The imperial gallon is larger than the U.S. gallon, so the same mpg number does not represent the same fuel consumption.
How do L/100 km and km/L read differently?
For L/100 km, lower is better. For km/L, higher is better.
How many U.S. mpg is 15 km/L?
15 km/L equals 35.2821875 U.S. mpg.
Why does the tool reject zero?
Some of these units are related by a reciprocal. Zero on one side corresponds to an unbounded value on the other, so the tool requires a value greater than zero.