Journey Fuel Cost Calculator

Estimate the fuel cost of a journey from the distance, your car’s fuel economy and the price you pay per litre. Add a return trip and split the cost between any number of passengers.

One-way distance

Fuel economy

Fuel price

Return trip (double the distance)

People sharing the cost (optional)

Results

Total journey distance

62mi

Total journey distance

100km

Estimated litres used

Total fuel cost

£12

Cost per mile

£0.193/ mi

Cost per kilometre

£0.12/ km

How this calculator works

The calculator converts your distance and fuel economy into litres used, then multiplies by the fuel price. A return trip simply doubles the one-way distance before the calculation, and the optional passenger count divides the total cost evenly.

Total distance (km) = one-way distance × 2 (if return)
Litres used = distance (km) × consumption (L/100 km) ÷ 100
Price per litre (£) = price (p) ÷ 100, or price (£) directly
Total cost = litres used × price per litre
Cost per person = total cost ÷ number of people

Worked example: a 100 km journey at 8 L/100 km with fuel at £1.50 per litre uses 100 × 8 ÷ 100 = 8 litres, costing 8 × £1.50 = £12.

What this estimate covers

This is a fuel-only estimate. It does not include wear, depreciation, tolls, parking, or the effect of driving style, traffic, weather, load, or terrain — all of which change real-world consumption. The prices you enter are your own figures and are not presented as current pump prices.

Frequently asked questions

Can I enter the price in pence per litre?

Yes. Use the unit selector to choose pence per litre (e.g. 150 for £1.50) or pounds per litre (e.g. 1.50). The calculator converts accordingly.

How does the return-trip option work?

Ticking “Return trip” doubles the one-way distance you entered before calculating fuel used and cost, so you only need to type the one-way distance once.

Why does my real cost differ from the estimate?

Fuel economy varies with speed, traffic, load, air conditioning, tyre pressure and driving style. The estimate uses the figure you enter, which is an average; your actual consumption on a given trip may be higher or lower.

Are the results rounded?

Yes. Calculations use full precision internally and only the displayed values are rounded.

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