MPG Calculator

Calculate fuel economy in miles per gallon.

Miles driven

Gallons used (gal)

Fuel economy (mpg) 29.167

Consumption (L/100km) 8.065

Formula: mpg = miles ÷ gallons

Step-by-step with your numbers:

1. Values used:

2. Miles driven = 350

3. Gallons used = 12 gal

5. Fuel economy = Miles driven / Gallons used = 350 / 12 = 29.167mpg

6. Consumption = 8.065L/100km

Did we solve your problem today?

Measure your car's fuel economy from the miles driven on a tank and the fuel it took to refill.

The math behind it

mpg = miles driven ÷ gallons used. Convert to L/100 km with 235.215 ÷ mpg.

350 mi on 12 gal → 29.2 mpg (≈8.06 L/100km).

Best way to measure?

Fill up, reset the trip meter, drive, then refill — divide trip miles by gallons added.