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MPG / Gas Mileage Calculator

Compute your fuel economy from a fill-up: miles driven ÷ gallons used.

Instant results Private — runs in your browser Updated January 1970

Inputs

Miles driven since last fill-up

Gallons to refill

Fuel price$/gallon

Fuel economy

$29.17

8.1 L/100 km

Cost per mile

$0.12

Annual fuel cost (15k mi)

$1,800.00

MPG

29.17 mpg

MPG = miles ÷ gallons. Cost per mile = price ÷ MPG. Annual cost assumes 15,000 miles per year.

How do I measure MPG accurately?

Fill the tank, note the odometer, drive normally, then fill up again. Divide miles by gallons used to refill.

Why does MPG vary tank-to-tank?

Highway vs city driving, weather, tire pressure, cargo weight, and driving style all affect fuel economy.

Are the EPA numbers realistic?

The EPA numbers are lab-tested. Real-world MPG usually lands 10–20% below the sticker.

How does this compare to L/100 km?

L/100 km = 235.215 ÷ MPG. Lower is better in metric; higher is better in MPG.

What about hybrids?

Hybrids often exceed 40 MPG in city driving. Compare highway MPG when doing long road trips.

Results are estimates for educational purposes only and are not financial advice. Verify with a qualified professional before making decisions.

Last updated January 1970