Convert Kilowatt-Hours (kWh) to Megajoules (MJ)
Convert kilowatt-hours (kWh) to megajoules (MJ): 1 kWh = 3.6 MJ, so multiply kWh by 3.6. Bridges the everyday electricity unit and the SI joule.
Formula
1 kWh = 3.6 MJ
To convert kWh to MJ, multiply the value by 3.6.
Conversion Table
| Kilowatt-Hours (kWh) | Megajoules (MJ) |
|---|---|
| 0.01 kWh | 0.036 MJ |
| 0.1 kWh | 0.36 MJ |
| 0.5 kWh | 1.8 MJ |
| 1 kWh | 3.6 MJ |
| 2 kWh | 7.2 MJ |
| 3 kWh | 10.8 MJ |
| 5 kWh | 18 MJ |
| 10 kWh | 36 MJ |
| 15 kWh | 54 MJ |
| 20 kWh | 72 MJ |
| 25 kWh | 90 MJ |
| 50 kWh | 180 MJ |
| 100 kWh | 360 MJ |
| 250 kWh | 900 MJ |
| 500 kWh | 1800 MJ |
| 1000 kWh | 3600 MJ |
| 2500 kWh | 9000 MJ |
| 5000 kWh | 18000 MJ |
| 10000 kWh | 36000 MJ |
| 50000 kWh | 180000 MJ |
Common kWh to MJ Examples
- 1 kWh = 3.6 MJ
- 5 kWh = 18 MJ
- 10 kWh = 36 MJ
- 25 kWh = 90 MJ
- 50 kWh = 180 MJ
- 100 kWh = 360 MJ
- 500 kWh = 1800 MJ
- 1000 kWh = 3600 MJ
About kWh to MJ
One kilowatt-hour is exactly 3.6 megajoules (1,000 W for one hour is 3,600,000 J), so kWh × 3.6 = MJ — 5 kWh = 18 MJ.
Kilowatt-hours are how electricity is metered and billed, while megajoules are the SI-based energy unit used in science, gas ratings and food energy. Converting kWh to MJ puts electricity use on the same footing as other energy figures.
Frequently Asked Questions
Where does the unit kWh come from?
Kilowatt-Hours is a standard Energy unit used in specific regions or fields. Its definition has been refined over time to match international measurement standards.
Where does the unit MJ come from?
Megajoules is a Energy unit with its own historical and regional roots, now defined in relation to internationally agreed reference standards.
How many decimal places should I keep when converting kWh to MJ?
For everyday use, 2 to 4 decimal places are enough. Scientific or engineering work may require 6 or more.
Can I convert MJ back to kWh?
Yes. Simply invert the ratio: divide the MJ value by 3.6 to get the equivalent in kWh.
What is the difference between kWh and MJ?
Both measure Energy, but they belong to different unit systems or scales, which is why a conversion factor is needed between them.
Why are there different units for Energy?
Different regions and industries developed their own Energy standards over time. International trade and science later required conversion tools to bridge them.