Fuel Cost Calculator
Calculate your annual, monthly and per-trip fuel spend — and see how much you could save with a more efficient car.
About the Fuel Cost Calculator
This calculator shows exactly what you spend on fuel — annually, monthly, weekly, and per trip. Enter your annual mileage, fuel efficiency and local fuel price to get an instant breakdown. The optional comparison section lets you see how much you would save by switching to a more efficient car or a different fuel type.
How is fuel cost calculated?
In metric: annual distance (km) ÷ 100 × efficiency (L/100km) × fuel price ($/L) = annual cost. In imperial: annual distance (miles) ÷ MPG × fuel price ($/gallon) = annual cost. The calculator divides by 12 for monthly and 52 for weekly figures.
Metric vs imperial
Toggle between metric (kilometres, litres, L/100km) and imperial (miles, gallons, MPG) using the buttons at the top. Note that MPG figures differ between the US (US gallons, 3.785 L) and the UK (imperial gallons, 4.546 L) — this calculator uses US gallons in imperial mode.
Efficiency comparison
The optional comparison section lets you enter a different efficiency figure — useful when you are comparing two cars, considering an upgrade, or wondering how much an electric vehicle would save on running costs versus petrol.