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UK Fuel Cost Calculator — how much will it cost to run?
Find out how much you'll spend on fuel per year before you buy. Enter your car's fuel economy, typical annual mileage, and fuel type.
Calculate annual fuel cost
Selected: p/L · Prices updated · Approximate UK averages (configure Fuel Finder for live prices)
UK MPG uses the imperial gallon (4.546 L). ≈ L/100km
≈ UK MPG (imperial gallon)
Public rapid charging typically costs more. This estimates home charging only.
Estimated fuel cost
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Buying a specific car? Check its MOT and mileage too.
CarVouch pulls official DVLA fuel type and engine data as part of a free scan.
Run a free car check →Tips for calculating real-world fuel costs
Use real-world MPG, not official figures. Real-world fuel economy is typically 15–25% lower than the manufacturer's official WLTP figure. Sites like Honest John and Fuelly publish crowdsourced real-world MPG data for most models.
UK MPG is not US MPG. UK spec sheets use the imperial gallon (4.546 litres). If you have L/100km from European data, use that input mode — we convert automatically.
Fuel prices change frequently. Our calculator uses live UK pump prices from the GOV.UK Fuel Finder service, last updated 5 Jun 2026 at 00:02.
Don't forget other running costs. Insurance, road tax, servicing, tyres and MOT can easily match or exceed annual fuel spend. Always factor in the full cost of ownership before buying.
Check the full picture before you buy
Fuel cost is just one part of the story. Run a free CarVouch scan to check MOT history, mileage, tax status and recall alerts on any UK car.
Run a free car check →No sign-up · No payment · Official DVLA & DVSA data