PetrolCalculator

Fuel calculator

Petrol to Mileage Calculator

Estimate range from an editable petrol budget.

Estimate your range

Enter the petrol price and your car’s fuel economy to estimate range.

What your result means

This turns an entered petrol budget into litres, then estimates driving range using the petrol price and UK MPG entered. A larger budget buys more litres at the same price, while better MPG increases estimated range.

Worked example

Using £20, 142p per litre and 45 UK MPG:

Petrol purchased
14.1 litres
UK gallons
3.1
Estimated range
139.4 miles

The calculation uses the same model as the fixed-budget range calculators.

Formula

Litres=Budget (£)Price (£/litre)\text{Litres}=\frac{\text{Budget (£)}}{\text{Price (£/litre)}}
Miles=Litres4.54609×UK MPG\text{Miles}=\frac{\text{Litres}}{4.54609}\times\text{UK MPG}

Range by petrol budget at 142p/litre and 45 UK MPG

BudgetPetrol purchasedEstimated range
£53.5 litres34.9 miles
£107 litres69.7 miles
£2014.1 litres139.4 miles
£3021.1 litres209.1 miles

Helpful questions

Does a larger budget always give more range?

At the same petrol price and MPG, yes: a larger budget buys more litres and therefore more estimated range.

Why does petrol price matter?

A higher price means the same budget buys fewer litres, reducing the estimated range.

What MPG should I use?

Use a measured real-world figure where possible. The MPG Calculator can help you calculate it.

Why can my actual range differ?

Traffic, speed, driving style, load and weather affect real fuel use. Litres to Miles Calculator can help explore the litres-to-range relationship.

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