Megajoules (MJ) to Joules (J) Conversion
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.
Joules
The joule (J) is the SI derived unit of energy, work, and heat, defined as the work done when a force of one newton displaces an object by one metre (J = N·m = kg·m²·s⁻²). Named after James Prescott Joule, who established the mechanical equivalent of heat in the 1840s, the joule unifies all forms of energy — mechanical, thermal, electrical, chemical, and nuclear — under one framework. One joule is small: lifting an apple (≈100 g) one metre requires about 1 joule, while a human at rest metabolises approximately 80 joules per second.
| Megajoules (MJ) | Joules (J) |
|---|---|
| 0.1 MJ | 100,000.00 J |
| 1 MJ | 1,000,000.00 J |
| 2 MJ | 2,000,000.00 J |
| 3 MJ | 3,000,000.00 J |
| 5 MJ | 5,000,000.00 J |
| 10 MJ | 10,000,000.00 J |
| 20 MJ | 20,000,000.00 J |
| 30 MJ | 30,000,000.00 J |
| 50 MJ | 50,000,000.00 J |
| 100 MJ | 100,000,000.00 J |
| 1000 MJ | 1,000,000,000.00 J |
Frequently Asked Questions (FAQ)
How many joules are in 1 megajoules?
1 megajoules (MJ) is exactly 1,000,000 joules (J).
How do I convert megajoules to joules?
Multiply the value in megajoules by 1,000,000 to get the result in joules. Or use the converter above — type any number and see the result instantly.