Fuel Economy Calculator
Calculate fuel economy in MPG and L/100km from distance driven and fuel used. Works with miles/gallons or km/litres.
100% client-side · no upload
How to use
- Select your distance unit (km or miles) and fuel unit (litres or US gallons).
- Enter the distance you drove and the amount of fuel used.
- Click Calculate Fuel Economy to see both L/100km and MPG results.
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More ways to use this tool
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.
- What is a good fuel economy?
- For petrol cars, under 7 L/100km (over 33 MPG) is considered efficient. Hybrid vehicles typically achieve 4–6 L/100km. The higher the MPG or the lower the L/100km, the more fuel-efficient your car.
- Why are L/100km and MPG inversely related?
- L/100km measures how much fuel you use per distance (lower is better), while MPG measures how far you go per unit of fuel (higher is better). To convert: MPG = 235.214 ÷ L/100km.
Last updated: By jarvisbox