Fuel Cost Calculator

Calculate fuel cost for any trip based on distance, MPG, and gas price. Compare costs between vehicles and find ways to save on fuel.

How it works

Fuel needed = distance ÷ efficiency (mpg or km/l). Trip cost = fuel needed × price per unit. Cost per mile = price ÷ mpg.

Worked example

A 450-mile trip at 32 mpg needs 14.1 gallons. At $3.60 a gallon that is $50.63, or 11.3 cents per mile.

Frequently asked questions

How do I convert mpg to l/100km?

Divide 235.2 by the mpg figure. 32 US mpg is about 7.4 l/100km — the standard measure in Europe and Canada.

What raises fuel consumption most?

Speed and aggressive driving. Above about 55 mph, consumption climbs sharply from aerodynamic drag, and hard acceleration can add 15–30% in city traffic.

Should I compare against an EV?

Use cost per mile. At 3.5 miles per kWh and $0.15/kWh, an EV runs about 4.3 cents per mile — roughly a third of a 32 mpg petrol car at $3.60.