Free Tool · UK Fuel
Fuel Cost Calculator
Enter your fuel type, pump price and MPG to see exactly what a journey costs — per mile, in litres and in pounds.
Fuel type
Your figures
Default is the current HMRC advisory rate for unleaded.
Results
Total fuel cost
£1697.21
for 10,000 miles at 156.8p/litre
Cost per mile
16.97p
Fuel used
1082.4 L
Cost per gallon
£7.13
Official mpg figures are optimistic. Real-world consumption is usually 10–20% higher. Pump prices change daily — check your local station for the current price. Default prices are based on HMRC advisory fuel rates and are for reference only.
How the calculation works
Fuel economy in the UK is measured in miles per gallon (mpg), but pumps dispense in litres. The conversion is 1 UK gallon = 4.54609 litres. So if you know your MPG and the price per litre, the cost per mile is simply the price per gallon divided by your MPG.
HMRC publishes advisory fuel rates each quarter as a guide for company car drivers to calculate fuel-only mileage payments. These are the defaults used here, but your actual pump price may be different so update it to get an accurate figure.
Real-world fuel economy is almost always lower than the manufacturer's official figure. A typical derating of 10–20% is common, particularly in urban driving, cold weather, or at motorway speeds above 70 mph. If you have a rough idea of your actual MPG from a previous fill-up, use that instead of the official figure.
Frequently asked questions
Track and reduce fuel spend across your fleet
Traknova gives you real MPG data per driver and vehicle — not just estimates — so you know exactly where the fuel budget is going.
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