When to use it
Use it after a refill, before a long trip, when comparing a used car, or when checking whether maintenance changes are affecting fuel economy.
Free vehicle calculator
Free Gas Mileage Calculator
A gas mileage calculator divides miles driven by gallons used to estimate MPG, cost per mile, fuel use, and full-tank range.
Formula
miles driven / gallons used
Use one full-tank refill cycle for the most reliable MPG.
Trip fill-up details
Enter miles driven and gallons used after a fill-up.
Miles per gallon
28.93 MPG
Cost per mile
$0.13
Gallons / 100 miles
3.46
Tank range
405 mi
RideVillage gas mileage estimate: 28.93 MPG from 312.4 miles and 10.8 gallons. Fuel cost was $39.42, or $0.13 per mile.
What it includes
The calculator includes MPG, gallons per 100 miles, cost per mile, total fuel cost, and estimated range from a full tank.
Plan shared rides
RideVillage helps families keep carpool schedules, drivers, riders, swaps, and reminders together once the vehicle math is settled.
Start a carpoolGas Mileage FAQ
How do you calculate gas mileage?
Divide miles driven by gallons used. If you drove 300 miles and used 10 gallons, your gas mileage is 30 MPG.
Should I use gallons purchased or the tank size?
Use gallons purchased during a full refill after recording miles driven. Tank size is useful for estimating range, but gallons used gives the MPG.
What is gallons per 100 miles?
Gallons per 100 miles shows fuel consumed over a fixed distance. Lower gallons per 100 miles means better fuel efficiency.
Why does MPG change between fill-ups?
MPG changes with city driving, speed, idling, weather, tire pressure, cargo weight, and route terrain.