Fuel Economy Converter
Convert between MPG, km/L and L/100 km fuel economy units.
What is Fuel Economy Converter?
Convert between MPG, km/L and L/100 km fuel economy units. The tool is designed for quick, practical calculations in a modern browser and does not require an account.
How to use this converter
- Enter the value you want to convert.
- Select the source and destination units.
- Choose Convert to see the equivalent value.
How the calculation works
Fuel economy units are not all linear in the same direction, so L/100 km needs a reciprocal conversion.
Core relationship: US MPG and L/100 km are related by approximately 235.214583 ÷ MPG.
Practical example
Enter a realistic set of values from your own task and compare the result with a second scenario. This is often the fastest way to understand how changing one input affects the output.
Important notes
Results are provided as a practical calculation or conversion aid. Rounding rules, local regulations, provider-specific formulas, taxes, fees or professional requirements can change the final real-world figure. Check official documentation when the result will be used for a legal, financial, engineering or operational decision.
MPG and L/100 km move in opposite directions
Higher MPG means better fuel economy, while lower liters per 100 km means better fuel economy. Because one measure is distance per fuel and the other is fuel per distance, conversion is reciprocal rather than a simple multiplier.
US and Imperial gallons are different
US MPG and Imperial MPG use different gallon sizes. Select the correct convention before comparing specifications from different countries.
Real-world consumption varies
Vehicle load, speed, temperature, terrain, tire pressure and driving style can make actual fuel use different from a rated or converted value.
Frequently Asked Questions
Is Fuel Economy Converter free to use?
Yes. You can use the tool without creating an account or paying a fee.
Does the calculation happen on this page?
Yes. The result is calculated directly from the values you enter. File and text tools use local browser processing where practical.
Can I use the result as an official figure?
Use it as a practical estimate or conversion. Confirm important legal, financial, engineering or provider-specific figures with the relevant official source.
Why does lower L/100 km mean better economy?
L/100 km measures how much fuel is consumed to travel a fixed distance, so using fewer liters is better.
Are US MPG and UK MPG the same?
No. An Imperial gallon is larger than a US gallon, so the numeric MPG values differ.