Gas & Fuel Cost Calculator

Free fuel cost calculator. Calculate total petrol or diesel cost for any trip based on distance, fuel efficiency and current fuel prices.

✓ Free to use ✓ Instant results ✓ Mobile friendly ✓ No sign-up needed

Trip Distance (miles)

Fuel Efficiency (MPG)

Fuel Price per Litre (£)

Total Fuel Cost

Fuel Needed

Cost per Mile

Cost per 100mi

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How to Calculate Trip Fuel Costs

To calculate how much a trip will cost in fuel: divide the distance by your car's MPG to get gallons needed, multiply by 4.546 to convert to litres, then multiply by the fuel price per litre.

UK Average Fuel Prices (2024)

Petrol (unleaded): ~£1.45–£1.60 per litre
Diesel: ~£1.50–£1.65 per litre
Prices vary by region and petrol station — motorway services are typically 10–15p more expensive.

Frequently Asked Questions

How do I find my car's MPG?+

Check your car's handbook, manufacturer website, or the honestjohn.co.uk database. Real-world MPG is typically 10–20% lower than official figures.

Is MPG or L/100km better?+

They measure the same thing differently. Higher MPG = more efficient. Lower L/100km = more efficient. This calculator uses MPG (UK standard).

How can I improve my fuel economy?+

Drive smoothly, maintain tyre pressure, remove roof racks when not in use, avoid idling, and keep your car serviced regularly.

Gas & Fuel Cost Calculator

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How to Calculate Trip Fuel Costs

UK Average Fuel Prices (2024)

Frequently Asked Questions

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