Fuel Cost Calculator

Calculate the exact fuel cost of any journey at current UK pump prices. Enter your distance, MPG and fuel type to see cost per mile, litres used and monthly or annual commute cost.

Last updated: April 2026

Journey details
UK average: petrol ~35 MPG, diesel ~45 MPG. Check your car's official figure.
Fuel cost
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How the fuel cost calculator works

The calculator converts your MPG figure to litres per 100km, then multiplies by the distance and the current fuel price per litre. UK pump prices are typically quoted in pence per litre. The calculator uses current average UK pump prices for petrol and diesel, updated regularly. You can also enter a custom price if you know your local pump price or use a loyalty card discount.

Current UK fuel prices

UK petrol prices at the pump average around 140–150p per litre in 2025, with diesel typically a few pence higher. Prices vary by region (motorway services typically charge 15–25p more than supermarket forecourts) and fluctuate with crude oil prices and the strength of the pound. Supermarket fuel is typically the cheapest available, with loyalty card deals offering occasional additional discounts.

Reducing your fuel costs

Beyond finding cheaper fuel, driving style has a significant impact on consumption. Smooth acceleration and braking, maintaining steady speeds, keeping tyres inflated to the correct pressure, and removing roof racks or boxes when not in use can collectively improve fuel economy by 10–20%. For regular long commutes, sharing the journey with a colleague can halve the fuel cost immediately.

Frequently asked questions

UK average fuel economy varies significantly by vehicle type. A typical petrol city car achieves 35–45 MPG, a family saloon 30–40 MPG, an SUV 25–35 MPG, and a hybrid 50–70 MPG on combined driving. These are WLTP official figures; real-world economy is typically 10–15% lower. You can find your car's official figure on the manufacturer's website or the Vehicle Certification Agency database.
To convert UK MPG to litres per 100km, divide 282.5 by your MPG figure. So 40 MPG equals 282.5 ÷ 40 = 7.06 litres per 100km. Note that UK MPG uses Imperial gallons (4.546 litres), not US gallons (3.785 litres), so US MPG figures are about 20% lower than UK equivalents for the same vehicle.
The home charging cost for an EV is roughly 4–6p per mile at typical home electricity rates, compared to 15–20p per mile for a petrol car at current pump prices. Over 10,000 miles per year, that is a saving of roughly £1,000–£1,500 annually on fuel alone. However, public rapid chargers can cost 60–80p per kWh, which narrows or eliminates the saving if you rely on them. The full financial case for an EV also depends on purchase price, servicing costs, and depreciation.

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