Kilowatt-hours (kW·h) to Megajoules (MJ) Conversion
Kilowatt-hours
The kilowatt-hour (kW·h) is a unit of energy equal to exactly 3,600,000 joules (3.6 MJ), defined as the energy consumed by a one-kilowatt device operating for one hour. It is the standard unit on electricity bills worldwide. A typical European household consumes approximately 3,500 kWh per year. One kWh powers a 100-watt bulb for 10 hours, charges an electric vehicle by approximately 5–8 km of driving range, or powers the average laptop for about 10 hours.
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.
| Kilowatt-hours (kW·h) | Megajoules (MJ) |
|---|---|
| 0.1 kW·h | 0.36 MJ |
| 1 kW·h | 3.6 MJ |
| 2 kW·h | 7.2 MJ |
| 3 kW·h | 10.8 MJ |
| 5 kW·h | 18 MJ |
| 10 kW·h | 36 MJ |
| 20 kW·h | 72 MJ |
| 30 kW·h | 108 MJ |
| 50 kW·h | 180 MJ |
| 100 kW·h | 360 MJ |
| 1000 kW·h | 3600 MJ |
Frequently Asked Questions (FAQ)
How many megajoules are in 1 kilowatt-hours?
1 kilowatt-hours (kW·h) is exactly 3.6 megajoules (MJ).
How do I convert kilowatt-hours to megajoules?
Multiply the value in kilowatt-hours by 3.6 to get the result in megajoules. Or use the converter above — type any number and see the result instantly.