About this tool
This free fuel cost calculator works out petrol or diesel costs for any journey, a daily commute or a road trip, and splits the cost between passengers.
How to work out fuel cost for a trip
- Enter the distance. One way; tick Return journey to double it.
- Enter fuel economy. From your car's handbook or dashboard: mpg in the UK and US, litres per 100 km elsewhere.
- Enter the fuel price. The price at the pump. Add passengers to split the cost.
Questions people ask
How do I work out fuel cost for a trip?
Fuel used = distance ÷ miles per gallon (or distance × L/100km ÷ 100). Cost = fuel used × price.
Are UK and US gallons the same?
No. A UK gallon is 4.546 litres; a US gallon is 3.785 litres, so UK mpg figures look higher.
Does it work for electric cars?
Use the Electricity cost calculator with your car's kWh per mile.
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