Convert between MPG (US), MPG (Imperial), L/100km, and km/L. Instant results.
To convert US MPG to L/100km, use the formula: L/100km = 235.214 ÷ MPG. For example, 30 MPG = 235.214 ÷ 30 = 7.84 L/100km. Note: these are reciprocal relationships, so better fuel economy means lower L/100km but higher MPG.
US MPG uses the US gallon (3.785 L), while Imperial MPG uses the Imperial gallon (4.546 L). A car rated at 30 US MPG gets approximately 36 Imperial MPG. This is why UK and US fuel economy ratings differ for the same vehicle.
Kilometers per liter (km/L) is a fuel economy metric used in some countries. It is the distance traveled per liter of fuel. Higher km/L means better fuel efficiency. 1 km/L ≈ 2.35 US MPG.
To convert L/100km to km/L, divide 100 by the L/100km value. For example, 8 L/100km = 100 ÷ 8 = 12.5 km/L. These are reciprocal — better efficiency is higher km/L but lower L/100km.
A good fuel economy is typically 35+ US MPG (6.7 L/100km or less) for a conventional gasoline car. Hybrid vehicles often achieve 50+ MPG. Electric vehicles are rated in MPGe (miles per gallon equivalent) for comparison purposes.