Overview
What Is a Gas Mileage Calculator?
This tool calculates your vehicle's fuel efficiency in miles per gallon (MPG) based on distance traveled and fuel used.
Calculate your vehicle's MPG instantly.
This tool calculates your vehicle's fuel efficiency in miles per gallon (MPG) based on distance traveled and fuel used.
Useful for monitoring vehicle performance, comparing trips, or budgeting fuel costs.
Input the distance traveled since your last fill-up.
Input how many gallons of fuel you used.
The result updates automatically.
MPG = Miles Driven ÷ Gallons of Fuel Used.
This varies by vehicle type - compact cars often achieve 30+ MPG, while trucks and SUVs may see 15-25 MPG.
Yes, aggressive acceleration and braking, high speeds, and excessive idling all reduce fuel efficiency.
Fill your tank completely, note the odometer reading, then calculate MPG at your next fill-up using miles driven and gallons used.
This calculator uses miles and gallons - for metric units, convert distance to miles and volume to gallons first, or calculate km/L directly using the same ratio logic.
Yes, underinflated tires and poor maintenance can meaningfully reduce fuel efficiency.
Highway driving typically yields better MPG due to more consistent speeds and less stop-and-go.
Yes, this is a useful comparison metric when evaluating vehicle options.
No, calculations happen entirely in your browser.
Yes, completely free with no sign-up required.