Receive an instant MPG calculation

With the prices of petrol and diesel spiralling, it's important to know just how well your vehicle is treating your wallet. Onboard computers are notoriously inaccurate, but there is a way to get an exact figure: record your mileage using your car's trip meter and keep the receipt you get when you fill up, putting in a full tank of fuel each time. Enter the figures below and receive a precise figure for your MPG.

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This calculator uses Imperial Gallons and Pounds Sterling for Britain - the USA uses gallons which differ by about 20%. Register an account for our fully functional calculator, supporting Imperial and US gallons, litres, CO2 g/km readings, statistics and much, much more!

Miles covered
Litres you put in
£ spent
at pence per litre
To know about how much CO2 was contributed, select the type of fuel you put in:
Fuel type

Register for more features

  • Record your mileage and efficiency over time
  • Create reports and charts showing cost increases or saving over time
  • Pinpoint areas where you can save fuel
  • Monitor multiple vehicles
  • Monitor environmental impact with total CO2 output and industry standard g/km readouts
  • Get banners showing showing your MPG for forum posts or your homepage
  • ... and much more, with much more to come!

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