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Fuel Cost Calculator
Trip
miles
MPG
p/litre
Fill in the fields above to see your result instantly.
How it works
UK MPG uses the imperial gallon (4.546 L). Convert miles → gallons → litres → cost using your pence-per-litre price.
Worked example
100 miles at 45 MPG, fuel 150p/L: 100/45 = 2.22 gal × 4.546 = 10.10 L × £1.50 = £15.15.
Who should use this
- •Drivers planning a long trip
- •Mileage expense claims
- •Comparing two cars' running cost
Common mistakes
- ×Using US MPG (smaller gallon) — UK MPG is 20% bigger
- ×Forgetting a round trip
Frequently asked questions
Why isn't my real MPG matching the brochure?▾
Manufacturer MPG is from a lab test (WLTP). Real-world is usually 10–25% lower.