Fuel Efficiency Calculator
Calculate MPG and L/100km, plus optional cost and emissions context.
Enter a distance and either the fuel you used or your MPG. We will calculate MPG and L/100km, and show the estimated fuel cost using the latest UK weekly average price.
Looking for a full trip cost? Try the journey cost calculator for price comparisons and best-value guidance. For regional context, browse the locations hub .
Use this when you know either litres used or MPG and want a clear efficiency and cost picture in UK units.
Inputs
UK unitsFuel info
Enter journey distance in miles.
Results
Enter your details to calculate
Fill in the form to see your results.
How this is calculatedv
- Enter trip distance and either litres used or MPG.
- We convert between MPG and L/100km automatically.
- If price data is available, we also estimate trip fuel cost and emissions context.