MPG Calculator
Calculate miles per gallon, gallons per 100 miles, cost per mile, and miles per dollar.
- Last reviewed
- July 8, 2026
- Cost
- Free to use
- Data
- Runs in your browser
Miles per Gallon
Enter valid inputs
Gallons per 100 Miles
Enter valid inputs
Cost per Mile
Enter valid inputs
Miles per Dollar
Enter valid inputs
Methodology
How this calculator handles inputs
This calculator uses the values you enter above and applies the formula explained in the guide below. Results update in the browser and are intended for quick planning, comparison, and sanity-checking.
- Use consistent periods, currencies, and units across inputs.
- Review any assumptions before using the result in a decision.
- Recalculate when rates, prices, tax rules, or business terms change.
Guide
How it works
Use this calculator to calculate miles per gallon from miles driven and gallons used.
What this calculator does
The MPG calculator estimates miles per gallon, gallons per 100 miles, cost per mile, and miles per dollar.
Formula
MPG = miles driven / gallons used
Cost per mile = gallons used x fuel price / miles driven
How to use it
Enter miles driven, gallons used, and the fuel price per gallon.
Common mistakes
- not filling the tank to the same level
- mixing city and highway trips without noting the difference
- using estimated gallons instead of receipt gallons
FAQs
Is MPG the same for every trip?
No. Speed, traffic, temperature, load, tires, and driving style can all change fuel economy.
Explore more
More calculators in this topic
Continue exploring
Related calculators
Explore the next calculations most relevant to this topic.
auto-vehicle
Gas Cost Calculator
Estimate fuel needed, trip cost, cost per mile, and annual fuel cost from MPG and gas price.
auto-vehicle
Cost of Ownership Calculator (car)
Estimate total car ownership cost from payment, insurance, fuel, maintenance, registration, and depreciation.
auto-vehicle
Car Depreciation Calculator
Estimate vehicle depreciation, annualized depreciation rate, and projected future value.