Convert mpg to km/l: 30 mpg (US) = 12.75 km/l, 30 mpg (UK) = 10.63 km/l. Includes L/100km with formula and table — free online.
Fuel consumption measures the relationship between the distance a vehicle travels and the volume of fuel consumed — but unlike most physical quantities, it is expressed worldwide in two opposite directions: kilometers per liter (km/l) and liters per 100 kilometers (L/100km), which are inverse relationships. This means that "doubling" the value in km/l does not correspond to "doubling" in L/100km: a car that does 10 km/l consumes 10 L/100km, and one that does 20 km/l consumes 5 L/100km — half the consumption, not double. Adding to this duality are the US and British systems, which use miles per gallon (mpg). The US gallon equals 3.7854 liters, while the UK imperial gallon equals 4.5461 liters — a difference of about 20% that causes confusion when comparing vehicles from the United States with vehicles from the United Kingdom. For this reason, the same number in "mpg" can mean quite different consumption depending on which gallon is being used. This converter correctly calculates between km/l, L/100km, mpg (US), and mpg (UK), handling the inverse relationships and the different-sized gallons. It is essential for anyone comparing imported vehicles, logistics and fleet professionals optimizing operating costs, and any driver who needs to translate consumption specifications between different measurement systems.
Divide 100 by the value in km/l. Example: 12 km/l = 100 ÷ 12 = 8.33 L/100km.
Multiply by 0.4251. Example: 30 mpg (US) = 12.75 km/l.
The US gallon is 3.7854 L and the imperial gallon is 4.5461 L. So 30 mpg (UK) ≈ 10.63 km/l, while 30 mpg (US) ≈ 12.75 km/l.
Both indicate efficiency. High km/l = more km with less fuel; low L/100km = less fuel per 100 km.
Yes, completely free, with no registration and no conversion limit.