What is the MPG Calculator?
Calculate your car’s real fuel economy from miles driven and gallons used. Know what a trip or a vehicle really costs. These auto and travel calculators cover fuel, charging, depreciation and the true per-mile cost of driving for commuters and professional drivers.
How to use the MPG Calculator
- Enter your miles driven, your gallons used.
- Results update automatically as you type; you can also press Calculate.
- Read the output: fuel economy, l/100 km, km/l.
- Use the 📊 chart to see the result visually, then copy or share it.
Formula and method
Worked example
With miles driven = 340, gallons used = 11.6, the MPG Calculator returns fuel economy: 29.31 mpg; l/100 km: 8.02; km/l: 12.46.
Tips for better results
- Use your real-world fuel economy rather than the window sticker.
- Depreciation is often the largest hidden cost of owning a car.
- Gig drivers should track every mile — it changes net hourly pay dramatically.
Frequently asked questions
What does the MPG Calculator do?
Calculate your car’s real fuel economy from miles driven and gallons used.
How is it calculated?
The MPG Calculator uses this method: MPG = Miles ÷ Gallons.
Can you show an example?
With miles driven = 340, gallons used = 11.6, the MPG Calculator returns fuel economy: 29.31 mpg; l/100 km: 8.02; km/l: 12.46.
Is the MPG Calculator accurate?
Yes. It uses standard formulas and exact constants, and the results are verified by our automated test suite. Values are displayed to up to 12 significant digits.
Is this tool free and private?
Yes — the MPG Calculator is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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