Megajoules to Kilojoules converter

To convert megajoules to kilojoules, enter the value in the first field. The result in kilojoules is calculated automatically using the exact conversion factor.

1 MJ = 1000 kJ
1 kJ = 0.001 MJ

Formula: kJ = MJ × 1000
MJ = kJ × 0.001

Definitions: 1 MJ = 1000000 J; 1 kJ = 1000 J

The megajoule (MJ) is one million joules. It is used for the energy content of fuels and for heating and gas measurements, and one kilowatt-hour equals 3.6 MJ.

The kilojoule (kJ) is 1,000 joules. It is used for food energy on nutrition labels in Australia, New Zealand and Europe, often next to kcal, and for reaction energies in chemistry.

See the conversion table with commonly used values, handy for quick reference or study.