Fuel Cost Calculator
Enter your annual mileage, fuel economy, and fuel type to see how much you spend on fuel each year. Uses current average UK fuel prices.
Frequently asked questions
What fuel prices does this calculator use?
The calculator uses average UK fuel prices as of April 2026: approximately 140p per litre for petrol and 147p per litre for diesel. Actual prices vary by region and retailer.
How do I find my car's real-world MPG?
The official WLTP figures on your car's specification sheet are a good starting point, but real-world economy is typically 10-20% lower. For a more accurate figure, fill your tank, reset the trip meter, drive normally, refill, and divide miles driven by litres used. Multiply by 4.546 to convert to imperial MPG.
Is diesel cheaper to run than petrol?
Diesel is more expensive per litre but diesel engines are typically 15-20% more fuel-efficient. For high-mileage drivers (over 12,000 miles per year), diesel can be cheaper overall. For lower mileage, petrol is usually more economical once you factor in higher diesel servicing costs.
How much does the average UK driver spend on fuel?
The average UK driver covers around 7,400 miles per year (DfT 2024). At 40 MPG in a petrol car, that works out to roughly £1,200 per year or £100 per month on fuel.
These calculations are estimates based on 2026/27 HMRC and DVLA rates. Speak to a lender or qualified financial adviser for a personalised quote.