How It Works
The calculator converts miles and MPG into litres of fuel required using the imperial gallon (4.546 L), then multiplies by the price per litre to give the total cost in pounds.
UK Journey Fuel Cost Calculator
Estimate fuel cost for a UK journey from distance in miles, fuel price in pence per litre, and vehicle MPG.
About this calculator
Uses imperial gallons (4.546 L) as standard in the UK. Fuel price should be the pump price in pence per litre. Adjust the number of passengers to split the cost evenly.
Result
£16.48
Estimated total fuel cost for a 100-mile journey.
- Total fuel cost
- £16.48
- Litres needed
- 11.37 L
- Cost per passenger
- £16.48
- Cost per mile
- £0.1648/mile
Calculation steps
- Convert 100 miles to km: 100 × 1.609344 = 160.93 km
- Convert 40 mpg (imperial) to L/100 km: (100 × 4.54609) / (40 × 1.609344) = 7.0620 L/100 km
- Litres needed: (160.93 / 100) × 7.0620 = 11.3652 L
- Total cost: 11.3652 L × 145p / 100 = £16.48
- Cost per passenger (1): £16.48 / 1 = £16.48
- Cost per mile: £16.48 / 100 = £0.1648/mile
Also in Vehicles
Transport
UK Journey Fuel Cost Calculator
Estimate the fuel cost of a UK journey from the distance in miles, current fuel price in pence per litre, and your vehicle's MPG.
Formula
Litres needed = (distance ÷ MPG) × 4.546. Cost = litres × price per litre ÷ 100.
Frequently asked questions
UK imperial gallons (4.546 litres). US gallons are smaller (3.785 litres), so using US MPG figures will underestimate costs.
Check petrol station price comparison sites or the RAC fuel watch page for average UK fuel prices.
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