Fuel cost calculator
Enter your car’s mpg, or pick the make and model, to see what each 100 miles, each month and each year costs, and how far a tank takes you.
This calculator needs JavaScript. The formula and a worked example are below.
Result
- Cost per 100 miles
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- Cost per month
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- Cost per year
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- Range on a full tank
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- Same in l/100 km
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Car data sources
Fuel consumption figures are official combined figures from the sources above. Real-world use is usually higher. All data sources
How it is calculated
Cost per 100 miles = consumption in l/100 km × price per litre × 1.609344 (km per mile). Cost per month = miles per month × 1.609344 ÷ 100 × consumption × price. Cost per year = cost per month × 12.
Range on a full tank = tank size in litres ÷ consumption × 100 km, divided by 1.609344 for miles. UK mpg (imperial gallons) is converted with l/100 km = 282.48 ÷ mpg.
Worked example
A car doing 45 mpg (6.3 l/100 km) with fuel at 145.9p a litre: 100 miles cost £14.74. Driving 600 miles a month costs £88.44, or £1,061.24 a year. A 50 litre tank takes you about 495 miles.
Real-world consumption depends on speed, load and weather and is usually higher than the official figure.