Fuel Economy Calculator
Enter distance and fuel used to calculate fuel economy in both MPG and L/100km.
100% client-side · no upload
L/100km
MPG (US)
How to use
- Enter the distance you drove and select km or miles.
- Enter the amount of fuel used and select litres or US gallons.
- Click Calculate Fuel Economy to see both L/100km and MPG results.
Related car tools
- MPG ↔ L/100km Converter — convert between fuel economy units instantly
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- EV Charging Cost Calculator — compare EV vs petrol running costs
Frequently Asked Questions
- Is this fuel economy calculator free?
- Yes, completely free with no signup and no usage limits.
- Does my data leave my device?
- No. All calculations run in JavaScript inside your browser. Nothing is sent to any server.
- Does it work on mobile?
- Yes. The calculator is mobile-first and works on iPhone Safari and Android Chrome.