How it works
Litres used = distance in km × consumption ÷ 100. Cost = litres × price per litre.
A worked example
A 100 km journey at 7 L/100 km and 1.50 per litre costs 10.50.
What to keep in mind
Enter one-way or round-trip distance as needed. Actual consumption varies with traffic, driving, load and weather. Excludes tolls and parking.
How to calculate fuel cost for a journey
Convert the distance to kilometres, multiply by your car’s consumption in litres per 100 km and divide by 100 to get litres. Multiply the litres by the price per litre.
Worked example
A 200-mile journey in a car using 6 litres per 100 km needs about 19.3 litres. At £1.50 a litre, that is about £28.97.
Converting mpg to litres per 100 km
Divide 282.48 by your UK miles per gallon. 47 mpg is about 6 L/100 km, 40 mpg is about 7.1 L/100 km and 30 mpg is about 9.4 L/100 km.
Frequently asked questions
How do I find my car’s fuel consumption?
Check your car’s trip computer or the official figure in your handbook. Real-world consumption is often higher than the official figure.
Should I enter one-way or return distance?
Enter the total distance you plan to drive. For a return trip, double the one-way distance.
Can I use a distance in miles?
Yes. Miles are converted to kilometres. Fuel economy should still be entered in litres per 100 km.
Results use the assumptions above. Check critical measurements and dates independently.