Convert watt-hours to kilojoules
1 Wh = 3.6 kJ — exactly. Both units are defined against the SI, so this factor is a fraction, not an approximation.
3.6kJ
As a fraction: 18/5
1 Wh = 3.6 kJ
How to convert watt-hours to kilojoules
Multiply the number of watt-hours by 3.6 to get kilojoules.
The exact factor is 3.6 — as a fraction, 18/5.
Watt-hour to Kilojoule conversion table
| Watt-hours (Wh) | Kilojoules (kJ) |
|---|---|
| 1 Wh | 3.6 |
| 2 Wh | 7.2 |
| 3 Wh | 10.8 |
| 5 Wh | 18 |
| 10 Wh | 36 |
| 20 Wh | 72 |
| 25 Wh | 90 |
| 50 Wh | 180 |
| 100 Wh | 360 |
| 250 Wh | 900 |
| 500 Wh | 1800 |
| 1000 Wh | 3600 |
Kilojoule to Watt-hour conversion table
| Kilojoules (kJ) | Watt-hours (Wh) |
|---|---|
| 1 kJ | 0.277 777 78 |
| 2 kJ | 0.555 555 56 |
| 3 kJ | 0.833 333 33 |
| 5 kJ | 1.388 888 9 |
| 10 kJ | 2.777 777 8 |
| 20 kJ | 5.555 555 6 |
| 25 kJ | 6.944 444 4 |
| 50 kJ | 13.888 889 |
| 100 kJ | 27.777 778 |
| 250 kJ | 69.444 444 |
| 500 kJ | 138.888 89 |
| 1000 kJ | 277.777 78 |
Frequently asked
How many kilojoules are in a watt-hour?
One watt-hour equals 3.6 kilojoules (Wh → kJ). That figure is exact, not rounded.
How do you convert watt-hours to kilojoules?
Multiply the number of watt-hours by 3.6 to get kilojoules.
What is 1 kJ in watt-hours?
One kilojoule is 0.2777777778 watt-hours.
What is 10 Wh in kJ?
10 Wh = 36 kJ.