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
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.