Gas Mileage Calculator

Calculate miles per gallon and fuel costs.

How to Do It Manually

Calculate fuel economy (MPG or L/100km) by dividing distance driven by fuel consumed.

MPG = miles driven / gallons used or L/100km = (liters used / km driven) × 100
  1. Note fuel level and odometer reading at the start.
  2. Drive and refuel, noting the odometer and fuel amount.
  3. Divide miles by gallons (or apply the L/100km formula).

Frequently Asked Questions

What affects fuel economy?

Driving habits (speed, acceleration), vehicle weight, maintenance, road conditions, and weather.

How can I improve gas mileage?

Drive smoothly, maintain tire pressure, reduce idling, use cruise control, and remove excess weight.