Fuel Cost Calculator
Find out how much a drive will cost in gas. Enter the distance, your car’s fuel economy and the price at the pump, in US or metric units.
Calculate your fuel cost
How to use the Fuel Cost Calculator
- Choose US or metric units.
- Enter the distance and tick round trip if you are coming back.
- Enter your fuel economy from your car’s trip computer or our MPG calculator.
- Enter the fuel price to see the total, per-mile cost and what happens if prices change.
For the full background, read our guide: How to Improve Gas Mileage: 20 Tips That Actually Work.
The formula behind it
Metric: Liters = km × L/100km ÷ 100
Fuel cost = Fuel used × Price per unit
Cost per mile = Fuel cost ÷ Distance
Frequently asked questions
How do I find my real MPG?
Fill the tank, reset the trip meter, drive normally, then fill up again. Divide the miles by the gallons you added. Our MPG calculator does it for you.
Why is my trip cost higher than expected?
Highway speeds above 65 mph, roof boxes, heavy loads, AC and cold weather can all lower fuel economy by 10 to 25%.
Should I use the EPA rating?
It is a reasonable starting point, but most drivers get a little less. Use the combined rating or your own measured MPG for the best estimate.
Can I use this for diesel?
Yes. Enter your diesel fuel economy and the diesel price per gallon or liter.
Related tools
Results are estimates for general information only. Always confirm with your vehicle owner’s manual or a qualified technician before acting on them.