Fuel Efficiency Converter
Convert between miles per gallon, kilometers per liter, liters per 100 kilometers, and more fuel efficiency units instantly.
About Fuel Efficiency Converter
Our Fuel Efficiency Converter is a comprehensive tool that allows you to convert fuel consumption and efficiency measurements between different units seamlessly. Whether you're comparing vehicle fuel economy, planning a road trip across different countries, or working on automotive engineering calculations, this tool provides accurate conversions across commonly used fuel efficiency units.
The tool supports conversions between Miles per Gallon (US) (mpg), Miles per Gallon (Imperial) (mpg), Kilometers per Liter (km/L), Liters per 100 Kilometers (L/100km), Gallons per 100 Miles (US), and Gallons per 100 Miles (Imperial). All conversions are calculated with high precision and displayed instantly as you type or change units.
Convert From
How to Use
Enter the Fuel Efficiency Value
Type the numerical value of the fuel efficiency you want to convert in the "Fuel Efficiency Value" field. You can enter whole numbers or decimals. The input accepts any positive number.
Select the Original Unit
Choose the unit of your input value from the "From Unit" dropdown. Options include Miles per Gallon US (mpg), Miles per Gallon Imperial (mpg), Kilometers per Liter (km/L), Liters per 100 Kilometers (L/100km), Gallons per 100 Miles US, and Gallons per 100 Miles Imperial.
Select the Target Unit
Choose the unit you want to convert to from the "To Unit" dropdown. You can also use the "Swap Units" button to quickly switch between the source and target units.
View Results
Click "Convert" to see the result. The tool will display the converted value, the formula used, and all possible conversions from your original value to every supported unit.
Common Conversions
Quick links to frequently used fuel efficiency conversions. Click any link to see the instant result.
Frequently Asked Questions
What is fuel efficiency?
Fuel efficiency is a measure of how far a vehicle can travel per unit of fuel consumed. It indicates how economically a vehicle uses fuel. Higher values in distance-per-fuel units (like mpg or km/L) indicate better efficiency, while lower values in fuel-per-distance units (like L/100km) indicate better efficiency.
What are the different fuel efficiency units?
Miles per Gallon US (mpg): Commonly used in the United States, measuring miles traveled per US gallon of fuel. Miles per Gallon Imperial (mpg): Used in the UK, measuring miles per Imperial gallon (which is larger than a US gallon). Kilometers per Liter (km/L): Used in many countries, measuring kilometers traveled per liter of fuel. Liters per 100 Kilometers (L/100km): Used in Europe, Canada, and Australia, measuring fuel consumption per 100 km. Gallons per 100 Miles: Less common, measuring fuel consumption per 100 miles traveled.
What is the difference between US and Imperial gallons?
A US gallon equals approximately 3.785 liters, while an Imperial gallon (used in the UK) equals approximately 4.546 liters. This means that the same mpg value using Imperial gallons represents better fuel efficiency than the same value using US gallons. To convert: mpg (Imperial) = mpg (US) × 1.201.
How do I convert mpg to L/100km?
To convert mpg (US) to L/100km: L/100km = 235.215 / mpg. For example, 30 mpg (US) equals approximately 7.84 L/100km. This inverse relationship means that higher mpg values correspond to lower L/100km values (better efficiency).
Is this tool free to use?
Absolutely! Our Fuel Efficiency Converter is completely free to use, with no registration required. We believe in providing high-quality, accessible tools for drivers, automotive enthusiasts, and anyone who needs to perform fuel efficiency conversions quickly and accurately.