MPG Formula: MPG = Miles driven since last fill-up / gallons needed to fill up

MPG Definition The MPG Calculator (Miles Per Gallon Calculator) will instantly calculate the MPG of any vehicle if you simply enter in the readout on the odometer at the previous gas fill up, the readout on the odometer at the current gas fill up, and the total amount of gas purchased in gallons to travel the distance between the two odometer readouts. Calculating MPG for a car or truck or just about anything is easy with our free online MPG calculator. Get started calculating what your vehicle’s MPG is now! Also, check out the UK MPG Calculator if you don’t live in the United States.

How to Calculate MPG Let's be honest - sometimes the best mpg calculator is the one that is easy to use and doesn't require us to even know what the mpg formula is in the first place! But if you want to know the exact formula for calculating mpg then please check out the "Formula" box above.