Car & travel · Week of 12 October 2026

Fuel cost calculator UK: petrol and diesel

Estimate a journey’s petrol or diesel cost using miles, UK MPG and pence per litre. Choose a dated UK pump-price reference or enter your own fuel price.

Enter your figures

Your estimate

Estimated journey fuel cost

£17.71

Fuel used10.1 litres

Distance100 miles

Default pump prices are UK averages for 12 October 2026: unleaded petrol 175.28p/litre, diesel 200.04p/litre (DESNZ). Choose a reference or enter your local price. Uses UK imperial MPG and 4.54609 litres per gallon. Enter total journey miles; excludes other motoring costs.

How the fuel cost calculator uk: petrol and diesel works

Litres = miles ÷ MPG × 4.54609. Cost = litres × pence per litre ÷ 100.

UK data and rules

Week of 12 October 2026 data · Checked 16 October 2026. Rules are a dated snapshot, not a live feed.

DESNZ — Weekly UK road fuel prices

Read about data coverage and updates

Worked example: journey fuel cost

This illustration uses the calculator’s example inputs. It is not a quote or a recommended financial decision.

Distance (miles): 100
Fuel economy (UK imperial MPG): 45
Fuel price (pence per litre): 175.28
Fuel price reference: UK unleaded average — 12 Oct 2026

Estimated journey fuel cost: £17.71

Litres = miles ÷ MPG × 4.54609. Cost = litres × pence per litre ÷ 100.

Journey fuel cost: questions answered

Does this calculator use UK or US MPG?

It uses UK imperial miles per gallon. One imperial gallon is 4.54609 litres. A US MPG figure uses a different gallon and would give the wrong result here.

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Using your result

Example inputs are a starting point. Replace them with your figures and select Calculate result. Results are rounded for display; calculations use unrounded values.

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