Free Fuel Economy Calculator: MPG & Trip Cost Estimator
Instantly calculate your vehicle’s fuel economy, estimated fuel usage, and total trip cost with this free online MPG and L/100km calculator.
Calculate fuel economy, estimated fuel usage, and trip cost.
How It Works
This tool divides the distance you traveled by the fuel you used to work out your fuel economy — shown as MPG, or as L/100km if you switch to metric units. It then multiplies your fuel amount by the price per unit to estimate your total trip cost and your cost per mile or kilometer.
The calculator divides total distance traveled by the amount of fuel used, giving you miles covered per gallon of fuel.
Yes. Selecting Litres per 100 km from the unit dropdown instantly switches the labels and formula to metric, using fuel used divided by distance, multiplied by 100.
It’s a close estimate based on the fuel amount and price you enter. Real-world costs can shift with fuel price changes, traffic, driving style, or terrain.
No. It runs directly in your browser on this page, works on both desktop and mobile, and requires no installation or sign-up.
