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Travel & transport · Free online tool
Fuel cost calculator
Estimate fuel used, journey cost and cost per traveller from distance and efficiency.
3 guest runs per rolling 24 hours10 with a free accountPrivate inputsMobile-friendly
Fuel cost calculator workspace
Runs locally in your browser
Official UK weekly averages · 19 October 2026
National DESNZ averages are useful benchmarks, not local forecourt quotes. Choosing one sets pounds per litre and GBP; you can still type another price. Inspect or download the maintained 13-week dataset.
Result
Total journey cost—
Cost per traveller—
Cost per trip—
Fuel used—
Total distance—
Cost per distance unit—
Quick answer
How much does it cost to drive 100 miles in the UK?
Litres used = miles ÷ mpg × 4.54609 (litres in a UK gallon), and the fuel cost = litres × price per litre. Using the 19 October 2026 UK average pump prices of 174.57p a litre for petrol and 199.33p for diesel:
| Fuel economy | Litres used | Petrol | Diesel |
|---|---|---|---|
| 35 mpg | 12.99 | £22.67 | £25.89 |
| 45 mpg | 10.10 | £17.64 | £20.14 |
| 55 mpg | 8.27 | £14.43 | £16.48 |
Enter your own distance, mpg and price in the calculator above. Prices are from the UK weekly fuel prices page.
Running costs at home
Worked out what the car costs? The same pence-per-unit sum works for the house: see what an electric heater, oil-filled radiator, electric blanket, dehumidifier or heated airer costs to run with the appliance running costs calculator at the Ofgem price cap rate.
Use it with confidence
How to use the fuel cost calculator.
Calculate and review
Use the main action when needed. Choose miles with UK MPG or kilometres with litres per 100 km; both are converted to litres for the cost.
Try a worked example
For UK MPG, litres used = miles ÷ MPG × 4.54609 before multiplying by price per litre.
Check the assumptions
Traffic, weather, load, driving style and pump prices make actual fuel use vary.
A clearer answer
How much fuel will a UK journey use and cost?
Enter miles with UK MPG or kilometres with litres per 100 km, then add the pump price, number of trips and people sharing. Every path converts consumption to litres before calculating cost.
See the useful decision, not only one number.
The calculator explicitly uses the 4.54609-litre imperial gallon for UK MPG, supports both common efficiency systems and now shows total, per-trip, per-distance and per-traveller costs.
Worked example: 150 miles using the 19 October 2026 benchmark
A 150-mile journey at 45 UK MPG uses about 15.15 litres. At the 19 October 2026 official unleaded average of £1.7457 per litre, the fuel-only cost is about £26.45, or 17.64p per mile. Shared equally by three people, that is about £8.82 each.
Method: Litres = miles ÷ UK MPG × 4.54609. Journey cost = litres × price per litre.
Common mistakes to avoid.
- Using a US gallon conversion with UK MPG
- Forgetting to count a return trip
- Using a best-case efficiency figure
- Treating fuel cost as the complete cost of owning or running a vehicle
Use the result with the right assumptions.
Use a recent local pump price for an individual decision. Official UK weekly averages are linked below for broad comparisons; traffic, weather, load and driving style still change actual use.
Official UK weekly benchmark
Average petrol and diesel pump prices.
Week commencing 19 October 2026. Use a current local forecourt price for an individual journey.
Source: Weekly road fuel prices, Department for Energy Security and Net Zero. These are national weekly averages, not a forecast or a local quote.
Contains public sector information licensed under the Open Government Licence v3.0.
Checked sources
Official guidance behind this tool.
Weekly road fuel prices
The UK government publishes accredited weekly average petrol and diesel pump-price statistics. A local current price remains more accurate for an individual journey.
Reference checked 28 July 2026. The source takes priority if guidance changes.
Helpful answers
Fuel cost calculator FAQs.
Is the fuel cost calculator free?
Yes. Guests receive 3 runs per rolling 24 hours, verified free accounts receive 10, and Premium subscribers receive unlimited normal use.
Does UtilHub upload or save my inputs?
No. This tool runs in your browser and UtilHub does not receive or store the values you enter. Your browser or device may still retain normal local history or form data.
How does this fuel cost calculator work?
Choose miles with UK MPG or kilometres with litres per 100 km; both are converted to litres for the cost.
What should I check before using the result?
Traffic, weather, load, driving style and pump prices make actual fuel use vary.
Does UK MPG use an imperial or US gallon?
It uses the imperial gallon, approximately 4.54609 litres. Using the smaller US gallon would understate the litres required for a UK MPG figure.
Is the fuel estimate the same as a mileage claim?
No. Fuel is only one vehicle cost. Business mileage reimbursement follows employer terms and applicable HMRC rules, which are handled separately by the mileage allowance calculator.
How much does it cost to drive 100 miles in the UK?
At 45 mpg, 100 miles uses about 10.10 litres. At the 19 October 2026 UK average pump prices that is about £17.64 on petrol (174.57p/L) or £20.14 on diesel (199.33p/L).