Gas Mileage Calculator
Calculate MPG, km/L, and L/100km from your distance driven and fuel used
Enter the distance you drove and the fuel you used, and this calculator returns your fuel economy three ways at once: MPG (US gallons), km/L, and L/100km. You can also enter a previous fill-up alongside it to see, as a percentage, whether your mileage improved or slipped — useful if you're watching fuel costs or trying to clean up your driving habits. All calculations run in your browser, and your inputs never go to a server.
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🔒 Everything runs 100% in your browser. Your files and input are never uploaded to any server.
How to use
- Choose your distance unit (km or miles) and fuel unit (liters or gallons).
- Enter the distance driven and the amount of fuel used.
- See your fuel economy in km/L, MPG, and L/100km right away.
- If you'd like, enter a previous trip's distance and fuel to compare how your mileage changed, then copy the results.
FAQ
- Should I go by MPG, km/L, or L/100km?
- All three are the same result shown in different units. MPG is the standard in the US, L/100km is used across Europe, and km/L is common in Korea and Japan — pick whichever matches what you're comparing against.
- How do I use the comparison feature?
- Once you have a result, enter a past trip's distance and fuel amount under "Compare with a previous record" and the tool shows the difference from your current mileage in both km/L and percent.
- Is my trip data saved?
- No. The tool just calculates on the fly in your browser — refresh the page and your inputs are gone.