Fuel economy converter
UK and US MPG, litres per 100 km and km per litre.
45 mpg is
6.27735 L/100km
In every unit
- Miles per gallon (US)37.4703 US mpg
- Kilometres per litre15.9303 km/L
- Litres per 100 km6.27735 L/100km
Show workings
- FormulaL/100km = 100 ÷ km per litre
- Result45 mpg = 6.27735 L/100km
How it works
MPG measures how far you go on a gallon (higher is better); L/100km measures how much fuel you use to cover a distance (lower is better), so it's 100 ÷ km per litre rather than a straight multiply. UK MPG uses the bigger 4.546-litre gallon, so the same car shows a higher MPG in the UK than in the US.
Worked example
40 miles per gallon (uk) is 7.06202 L/100km.
Miles per gallon (UK) to litres per 100 km chart
| mpg | L/100km |
|---|---|
| 20 | 14.124 L/100km |
| 30 | 9.41603 L/100km |
| 40 | 7.06202 L/100km |
| 45 | 6.27735 L/100km |
| 50 | 5.64962 L/100km |
| 55 | 5.13602 L/100km |
| 60 | 4.70802 L/100km |
| 70 | 4.03544 L/100km |
Questions
What is 50 mpg in L/100km?
5.65 L/100km (UK gallons). In US gallons, 50 mpg is 4.7 L/100km.
Why are UK and US MPG different?
A UK gallon is 4.546 litres and a US gallon 3.785 litres. 50 UK mpg is about 41.6 US mpg for the same car.
What does my fuel economy cost per journey?
Use the fuel cost calculator: it works out litres used and cost from the distance and your MPG or L/100km.