MPG Calculator
Real fuel economy from your own fill-ups.
Enter your values
Results update instantly as you type — no submit needed.
Results
- Fuel economy
- 30 mpg
- Litres per 100 km
- 7.84
- Kilometres per litre
- 12.75
- Imperial mpg
- 36.03
Working
- 1MPG = 342 ÷ 11.4 = 30
Quick answer
Fuel economy is miles driven divided by gallons used between two full fill-ups.
MPG = miles ÷ gallons
How to use the MPG Calculator
- 1Fill the tank and reset the trip meter.
- 2At the next fill-up, note the miles and gallons.
- 3Enter both to get true economy.
Frequently asked questions
Why is my mpg worse in winter?
Cold engines run rich, winter fuel blends carry less energy, and heaters and denser air all reduce economy by 10–20%.
What is UK mpg?
Imperial mpg, based on the larger imperial gallon, so it reads about 20% higher than the US figure for the same car.