Kilojoules (kJ) to Megajoules (MJ) Conversion
Kilojoules
The kilojoule (kJ) is a unit of energy equal to exactly 1,000 joules. It is the standard unit for expressing food energy in most countries outside the United States, where food labels display energy in both kilojoules and kilocalories (kcal). One kilocalorie equals exactly 4.184 kilojoules. In thermodynamics and chemistry, reaction enthalpies and bond energies are commonly tabulated in kilojoules per mole (kJ/mol).
Megajoules
The megajoule (MJ) is a unit of energy equal to exactly 1,000,000 joules (10⁶ J). It is used in energy policy, engineering, and physics for large-scale energy quantities. One kilowatt-hour (kWh) equals exactly 3.6 MJ — the conversion fundamental to understanding electricity bills. A litre of petrol contains approximately 34 MJ of chemical energy. The explosive yield of conventional explosives is sometimes expressed in megajoules.
| Kilojoules (kJ) | Megajoules (MJ) |
|---|---|
| 0.1 kJ | 0.0001 MJ |
| 1 kJ | 0.001 MJ |
| 2 kJ | 0.002 MJ |
| 3 kJ | 0.003 MJ |
| 5 kJ | 0.005 MJ |
| 10 kJ | 0.01 MJ |
| 20 kJ | 0.02 MJ |
| 30 kJ | 0.03 MJ |
| 50 kJ | 0.05 MJ |
| 100 kJ | 0.10 MJ |
| 1000 kJ | 1.00 MJ |
Frequently Asked Questions (FAQ)
How many megajoules are in 1 kilojoules?
1 kilojoules (kJ) is exactly 0.001 megajoules (MJ).
How do I convert kilojoules to megajoules?
Multiply the value in kilojoules by 0.001 to get the result in megajoules. Or use the converter above — type any number and see the result instantly.