The working behind the answer
How to use this calculator
Choose the distance and efficiency units used by your vehicle, then enter the total journey distance. Include a return leg if applicable. The price is always per litre, even in an MPG mode, so the tool converts gallons before applying the price.
The formula
Kilometres and litres per 100 km
Litres = kilometres × litres per 100 km ÷ 100; cost = litres × price
Miles and UK imperial MPG
Litres = miles ÷ UK mpg × 4.54609
Miles and US liquid MPG
Litres = miles ÷ US mpg × 3.785411784
A worked example
At 6 litres per 100km, a 100km journey uses 6 litres. With an entered price of £1.50 per litre, the estimated fuel cost is £9.
Good to know
Consumption is assumed constant. Traffic, driving style and load can change real fuel use. No live fuel price, toll, parking, depreciation or maintenance cost is included. UK and US gallons are different sizes.
Common questions
Does this fetch local fuel prices?
No. Enter the price you want to use so the calculation has no dependency on a live price service.
Which MPG mode should I choose?
Choose the gallon definition used by your fuel-consumption figure: UK imperial or US liquid.