Gas Mileage Calculator
Calculate your vehicle's fuel efficiency in MPG or L/100km.
Fill-Up Data
What is the Gas Mileage Calculator?
The Gas Mileage Calculator is an automotive tool that determines your vehicle's true fuel efficiency in Miles Per Gallon (MPG) or Liters per 100km. Tracking real-world fuel economy is the best way to diagnose early engine problems or tire pressure issues.
How It Works (Formula)
The math is a simple ratio of distance over volume. By taking the total miles driven between fill-ups and dividing it by the exact number of gallons it took to refill the tank, you find your vehicle's actual operating efficiency.
$$ \text{MPG} = \frac{\text{Miles Driven}}{\text{Gallons Consumed}} $$
Use the trip odometer on your dashboard for accurate measurements.
How to Use It
Next time you buy gas, reset your trip odometer. On your following visit to the gas station, enter the miles driven from your odometer, and input the number of gallons you just purchased from the pump receipt. The calculator will reveal your true MPG.