Convert fuel economy between miles per gallon and liters per 100 kilometers, the two ways the world measures how thirsty a car is. This is not a simple multiplication: mpg measures distance per fuel while L/100km measures fuel per distance, so the two are inversely related and the tool applies the correct reciprocal formula. It also separates US gallons from UK (imperial) gallons, since a UK mpg figure looks better than a US one for the exact same car. Pick the units you have and want, type a value, and the converted figure updates live as you type. Everything is computed in your browser, so results are instant, your numbers stay private, and it keeps working offline once the page loads.