1 watt hour to kilojoules
1 Wh = 3.6 kJ. Change the amount below, or read the formula and the reference table further down.
1 watt hour equals
kilojoules
1 Wh = 3.6 kJ
The formula
Watt hours and kilojoules both measure energy from the same zero, so a single multiplier does the job.
kJ = Wh × 3.6
Going the other way? Convert kilojoules to watt hours.
Watt hours to kilojoules table
Values either side of 1 Wh.
| Watt hours (Wh) | Kilojoules (kJ) |
|---|---|
| -4 | -14.4 |
| -3.5 | -12.6 |
| -3 | -10.8 |
| -2.5 | -9 |
| -2 | -7.2 |
| -1.5 | -5.4 |
| -1 | -3.6 |
| -0.5 | -1.8 |
| 0 | 0 |
| 0.5 | 1.8 |
| 1 | 3.6 |
| 1.5 | 5.4 |
| 2 | 7.2 |
| 2.5 | 9 |
| 3 | 10.8 |
| 3.5 | 12.6 |
| 4 | 14.4 |
| 4.5 | 16.2 |
| 5 | 18 |
| 5.5 | 19.8 |
| 6 | 21.6 |
Questions people ask
- How many kilojoules are in a watt hour?
- One watt hour equals 3.6 kilojoules.
- How do I convert watt hours to kilojoules by hand?
- Multiply the number of watt hours by 3.6. For a rough check, 3.6 is close enough for most everyday use.
- What is 1 watt hour in kilojoules?
- 1 watt hour is 3.6 kilojoules.
Calcuit generates this page from a unit table, so the factors here match every other page on the site.