MPG Calculator
Work out fuel economy in seconds with this MPG calculator. Compare UK and US MPG from miles or km, litres or gallons, with clear conversions.
Check Your Fuel Economy Quickly
A good MPG calculator takes the guesswork out of working out fuel economy. If you know how far you’ve travelled and how much fuel you’ve used, you can get a clear miles per gallon figure in seconds. This is especially useful when you’re comparing cars, tracking running costs, or checking whether your vehicle is performing as expected.
Built for Everyday Driving
One of the biggest sources of confusion is the difference between UK and US gallons. They aren’t the same size, so MPG figures can look different even when the journey and fuel use are identical. This tool handles that for you automatically, giving you both UK MPG and US MPG with the right conversions applied.
Simple Inputs, Clear Results
You can enter distance in miles or kilometres, and fuel in litres, UK gallons, or US gallons. The calculator converts the values behind the scenes and shows the main result in your chosen standard, along with the equivalent figure in the other one. That makes this miles per gallon calculator handy for drivers, buyers, and anyone comparing published fuel economy numbers from different regions.
For a fast, no-fuss way to measure efficiency, this fuel economy calculator keeps things clear, accurate, and easy to use.
FAQs
What’s the difference between UK MPG and US MPG?
The gallon size is different, which is why the MPG figure changes. A UK gallon is larger than a US gallon, so the same trip and fuel use will usually give a higher UK MPG number. This tool shows both standards side by side, which helps if you’re comparing vehicle specs, road tests, or fuel economy figures from different countries.
Can I use litres and kilometres instead of gallons and miles?
Yes, that’s exactly what the calculator is designed for. If you enter kilometres, it converts them to miles. If you enter litres, it converts the fuel amount into both UK and US gallons before calculating the results. That means you can use the numbers from your dashboard, fuel receipt, or trip computer without doing the maths yourself.
Why does the calculator show two MPG results?
Showing both results avoids confusion. Many drivers in the UK are familiar with UK MPG, but car reviews, imported vehicles, and international websites often use US MPG. By displaying a primary result plus the other standard as a comparison, the tool gives you a clearer picture of your fuel economy and makes it easier to compare like for like.