Watt Hour to Kilojoule (Wh to kJ)
Convert Wh to kJ — Energy converter
One watt hour equals 3.6 kJ, so to convert watt-hours to kilojoules you multiply the value by 3.6. A watt hour is larger than a kilojoule — going the other way, 1 kJ = 0.27777778 Wh. For example, 10 Wh = 36 kJ and 50 Wh = 180 kJ.
3.6Click to copy
1 Wh = 3.6 kJ
Watt Hour to Kilojoule formula
1 Watt Hour = 3.6 kJ
Worked examples
- 25 Wh = 90 kJ
- 100 Wh = 360 kJ
Watt Hour to Kilojoule conversion table
| Watt Hour (Wh) | Kilojoule (kJ) |
|---|---|
| 1 | 3.6 |
| 2 | 7.2 |
| 3 | 10.8 |
| 5 | 18 |
| 8 | 28.8 |
| 10 | 36 |
| 12 | 43.2 |
| 15 | 54 |
| 20 | 72 |
| 25 | 90 |
| 50 | 180 |
| 100 | 360 |
| 250 | 900 |
| 500 | 1800 |
| 1000 | 3600 |
Frequently asked questions
How many kilojoules are in one watt hour?
One watt hour equals 3.6 kilojoules (kJ).
How many watt-hours are in one kilojoule?
One kilojoule equals 0.27777778 watt-hours (Wh).
How do you convert watt-hours to kilojoules?
1 Watt Hour = 3.6 kJ. Use the calculator above for any value.
What is 5 Wh in kJ?
5 Wh = 18 kJ.
What is 100 Wh in kJ?
100 Wh = 360 kJ.
What is 10 Wh in kJ?
10 Wh = 36 kJ.
What is 20 Wh in kJ?
20 Wh = 72 kJ.
Is a watt hour bigger than a kilojoule?
Yes. A watt hour is larger — one watt hour equals 3.6 kilojoules (kJ).