Fuel Economy Converter
Convert mpg, km/L, L/100km.
Input
Result
What is a Fuel Economy Converter?
A Fuel Economy Converter is a free online tool that converts fuel economy ratings between miles per gallon (MPG), kilometres per litre (km/L), and litres per 100 kilometres (L/100km). It is essential for comparing vehicle fuel efficiency across different measurement systems used in various countries.
How to calculate fuel economy conversion manually (the formula)
Fuel economy conversion uses a constant factor. To convert MPG to L/100km, divide 282.48 by the MPG value. To convert L/100km to MPG, divide 282.48 by the L/100km value. To convert km/L to L/100km, divide 100 by the km/L value.
Example calculation
Convert 30 MPG to L/100km: 282.48 ÷ 30 = 9.416 L/100km. Convert 8 L/100km to MPG: 282.48 ÷ 8 = 35.31 MPG. Convert 12 km/L to L/100km: 100 ÷ 12 = 8.333 L/100km.
Common mistakes
- Confusing US MPG with UK MPG — US and UK gallons differ in size. US MPG uses a 3.785 L gallon, UK MPG uses a 4.546 L gallon. Always verify which standard is being used.
- Using the wrong constant — The conversion constant for US MPG is 282.48. Using a different number will produce incorrect results.
- Mixing up L/100km and km/L — A higher L/100km means worse fuel economy, while a higher km/L means better fuel economy. They are inversely related.
Frequently asked questions
What is a Fuel Economy Converter?
A Fuel Economy Converter is a tool that converts fuel economy ratings between miles per gallon (mpg), kilometres per litre (km/L), and litres per 100 kilometres (L/100km).
How do I convert MPG to L/100km?
To convert MPG to L/100km, divide 282.48 by the MPG value. For example, 30 MPG: 282.48 ÷ 30 = 9.416 L/100km.
What is the formula for converting L/100km to MPG?
To convert L/100km to MPG, divide 282.48 by the L/100km value. For example, 8 L/100km: 282.48 ÷ 8 = 35.31 MPG.
What is the difference between US MPG and UK MPG?
US MPG uses a US gallon (3.785 L), while UK MPG uses an imperial gallon (4.546 L). UK MPG values are about 20% higher than US MPG for the same fuel economy.
How do I convert km/L to L/100km?
To convert km/L to L/100km, divide 100 by the km/L value. For example, 12 km/L: 100 ÷ 12 = 8.333 L/100km.