Gas Mileage Calculator
Calculate your vehicle's gas mileage in MPG and L/100km. Enter miles and gallons directly or use odometer readings.
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About the Gas Mileage Calculator
Gas mileage (fuel economy) is calculated as MPG = Miles driven / Gallons used. You can track your fuel economy by recording odometer readings at each fill-up and entering the amount of fuel you added. Knowing your MPG helps you budget for fuel costs and compare your car's performance against EPA estimates. To estimate the cost of an upcoming trip, use our Fuel Cost Calculator.
The L/100km figure is the metric equivalent: L/100km = 235.215 / MPG. Lower L/100km means better efficiency in metric countries, while higher MPG is better in the US. The optional tank size input lets you estimate your vehicle's full-tank range, and the fuel price input calculates your cost per mile. For trip distance and time planning, also check our Speed Calculator.
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For a related calculation, use Voltage Drop Calculator to calculate voltage drop and percentage for electrical circuits. Check NEC ≤3% compliance by wire gauge. Alternatively, use Fuel Cost Calculator to calculate trip fuel cost from distance, MPG, and fuel price. Also shows CO₂ emissions.