Gas Mileage Calculator
Enter the distance driven, fuel used and current gas price to calculate your miles per gallon (MPG) and the cost of fuel per mile.
Gas Mileage Calculator
Calculate MPG and fuel cost per mile
MPG = miles driven ÷ gallons used. Cost per mile = gas price per gallon ÷ MPG. Trip fuel cost = (miles ÷ MPG) × price per gallon.
How Gas Mileage Is Calculated
Gas mileage (MPG) measures how far your vehicle travels on one gallon of fuel:
MPG = miles driven ÷ gallons used
Cost per mile = price per gallon ÷ MPG Trip fuel cost = (miles driven ÷ MPG) × price per gallon
**Tips**: Fill the tank completely, drive until nearly empty, then refill and record both the gallons added and miles since the last fill for the most accurate MPG. Highway driving typically gets better MPG than city driving.
- MPG = miles ÷ gallons
- Cost per mile = price ÷ MPG
- Full-tank-to-full-tank method is most accurate
Worked Example
Example: 300 miles driven, 10 gallons used, $3.50 per gallon.
- MPG = 300 ÷ 10 = 30 MPG - Cost per mile = $3.50 ÷ 30 = $0.117 per mile (~12¢/mile) - Trip fuel cost = 10 × $3.50 = $35.00
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Open calculator →Frequently Asked Questions
Does this work for kilometers and liters?
This calculator uses miles and gallons. For metric, convert liters to gallons (1 gallon ≈ 3.785 litres) and kilometres to miles (1 mile ≈ 1.609 km) before entering, or use the Unit Converter tool.
Why is my real MPG lower than the sticker?
EPA sticker MPG is lab-tested. Real-world MPG depends on driving style, traffic, vehicle load, tire pressure, air conditioning use and temperature.
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