Convert watt-hours to kilojoules
Watt-hour (Wh) to kilojoule (kJ). One watt-hour equals 3.6 kilojoules.
Formula
Watt-hour to kilojoule conversion table
| Watt-hours | Kilojoules | Kilojoules | Watt-hours |
|---|---|---|---|
| 1 Wh | 3.6 kJ | 1 kJ | 0.277778 Wh |
| 2 Wh | 7.2 kJ | 2 kJ | 0.555556 Wh |
| 3 Wh | 10.8 kJ | 3 kJ | 0.833333 Wh |
| 5 Wh | 18 kJ | 5 kJ | 1.3889 Wh |
| 10 Wh | 36 kJ | 10 kJ | 2.7778 Wh |
| 20 Wh | 72 kJ | 20 kJ | 5.5556 Wh |
| 50 Wh | 180 kJ | 50 kJ | 13.8889 Wh |
| 100 Wh | 360 kJ | 100 kJ | 27.7778 Wh |
| 500 Wh | 1800 kJ | 500 kJ | 138.89 Wh |
| 1000 Wh | 3600 kJ | 1000 kJ | 277.78 Wh |
To convert watt-hours to kilojoules, multiply the number of watt-hours by 3.6. One watt-hour equals 3.6 kilojoules, and one kilojoule equals 0.277778 watt-hours, so the relationship is fixed and exact. As a worked example, 10 Wh comes to 36 kJ. Enter your own figure in the converter above to get an instant answer, or use the swap button to flip the direction. This is a energy conversion, and like every tool on UnitGlide it runs locally in your browser with no account or upload required. The table further down shows a range of common watt-hour values already worked out in kilojoules, plus the reverse kilojoule to watt-hour direction, which is handy for quick reference or double-checking a result by hand.
Frequently asked questions
How many kilojoules are in a watt-hour?
One watt-hour equals 3.6 kilojoules. The ratio is constant, so you can multiply any number of watt-hours by 3.6 to get kilojoules.
What is the formula to convert watt-hours to kilojoules?
Use kilojoules = watt-hours × 3.6. UnitGlide applies this exact formula for every value, so results stay accurate across the whole range.
How do I convert kilojoules back to watt-hours?
Go the other way by using one kilojoule equals 0.277778 watt-hours. You can also press the swap button in the converter above to flip the direction in one click.
Is this watt-hour to kilojoule converter accurate?
Yes. It uses internationally defined SI conversion factors, as maintained by the BIPM, and all math runs in your browser so nothing is rounded away on a server. For everyday use the displayed precision is more than enough.