Automotive

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Fuel Economy Calculator.

Calculate MPG and fuel costs for trips

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Set your values

Results update as you type.

Measurement System

How to Use

Calculate your vehicle's fuel economy and costs:

  • Miles per gallon (MPG) or kilometers per liter
  • Fuel costs per mile/kilometer
  • Daily, weekly, monthly, and yearly fuel costs
  • Driving range with full tank

Cite this calculator

Canonical URL: https://mathify.one/fr/automotive/fuel-economy

Cite as: Mathify. (2026). Consommation de Carburant. https://mathify.one/fr/automotive/fuel-economy

Use Cases

Plan a road trip budget

Estimate the fuel cost for a planned trip by entering the total distance, expected fuel consumption, and current fuel price.

Example: Enter distance 500 miles, fuel used 20 gallons, fuel price $3.50/gal to get a cost of $70.

Monitor your vehicle's fuel efficiency

Track your car's MPG over time by entering distance and fuel used after each fill-up to see if your vehicle is performing well.

Example: After driving 300 miles and using 10 gallons, your MPG is 30.

Frequently Asked Questions

How do I calculate MPG with this calculator?
Enter the distance traveled and the fuel used (in gallons or liters) in the corresponding fields. The calculator will divide distance by fuel used to give you your miles per gallon (MPG).
What is the fuel cost for a trip?
Input the distance of your trip, the fuel used, and the fuel price per unit. The calculator multiplies fuel used by fuel price to estimate the total fuel cost for that trip.
Can I estimate my driving range on a full tank?
Yes, if you provide your tank size and daily miles, the calculator can estimate how many miles you can drive on a full tank and how many days that might last based on your average daily driving.

Tips & Common Mistakes

Tips

  • For accurate MPG, fill your tank completely, reset your trip odometer, and drive until the next fill-up. Then enter the exact distance and fuel used.
  • Use the same units (miles/gallons or kilometers/liters) for distance and fuel to get consistent results.
  • Check your fuel price at the pump or use a local average for more precise cost estimates.
  • If you know your tank size and daily miles, you can estimate how often you'll need to refuel.

Common Mistakes to Avoid

  • Mixing units: entering distance in miles but fuel in liters will give incorrect MPG. Stick to one unit system.
  • Not resetting the trip odometer before measuring, leading to inaccurate distance input.
  • Forgetting to include the fuel price per unit, which results in missing the cost calculation.

Last updated: August 13, 2026