PetrolCalculator

Fuel calculator

Fuel Cost Calculator UK

Estimate petrol or diesel fuel needed and journey cost.

Use this calculator

Enter journey details to estimate fuel required and cost.

What your result means

This estimates fuel required and fuel cost from the journey distance, UK MPG and price per litre entered. It covers fuel only, not insurance, tax, servicing or other ownership costs.

Worked example

Using 100 miles, 45 UK MPG and 142p per litre:

Journey miles
100
UK gallons required
2.22
Petrol required
10.1 litres
Estimated fuel cost
£14.35

The same model also applies an optional return journey before calculating fuel use.

Formula

UK gallons=Journey milesUK MPG\text{UK gallons}=\frac{\text{Journey miles}}{\text{UK MPG}}
Litres=UK gallons×4.54609\text{Litres}=\text{UK gallons}\times4.54609

Helpful questions

Does a return journey double the estimate?

Yes. With the same MPG and price, selecting a return journey doubles the entered distance, fuel required and estimated fuel cost.

Why can actual fuel use differ?

Traffic, speed, driving style, load, weather and road conditions affect real-world MPG. Use the MPG Calculator to measure a real figure.

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