Convert watt-hours to joules
Watt-hour (Wh) to joule (J). One watt-hour equals 3600 joules.
Formula
Watt-hour to joule conversion table
| Watt-hours | Joules | Joules | Watt-hours |
|---|---|---|---|
| 1 Wh | 3600 J | 1 J | 0.000278 Wh |
| 2 Wh | 7200 J | 2 J | 0.000556 Wh |
| 3 Wh | 10800 J | 3 J | 0.000833 Wh |
| 5 Wh | 18000 J | 5 J | 0.001389 Wh |
| 10 Wh | 36000 J | 10 J | 0.002778 Wh |
| 20 Wh | 72000 J | 20 J | 0.005556 Wh |
| 50 Wh | 180000 J | 50 J | 0.013889 Wh |
| 100 Wh | 360000 J | 100 J | 0.027778 Wh |
| 500 Wh | 1800000 J | 500 J | 0.138889 Wh |
| 1000 Wh | 3600000 J | 1000 J | 0.277778 Wh |
To convert watt-hours to joules, multiply the number of watt-hours by 3600. One watt-hour equals 3600 joules, and one joule equals 0.000278 watt-hours, so the relationship is fixed and exact. As a worked example, 10 Wh comes to 36000 J. 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 joules, plus the reverse joule to watt-hour direction, which is handy for quick reference or double-checking a result by hand.
Frequently asked questions
How many joules are in a watt-hour?
One watt-hour equals 3600 joules. The ratio is constant, so you can multiply any number of watt-hours by 3600 to get joules.
What is the formula to convert watt-hours to joules?
Use joules = watt-hours × 3600. UnitGlide applies this exact formula for every value, so results stay accurate across the whole range.
How do I convert joules back to watt-hours?
Go the other way by using one joule equals 0.000278 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 joule 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.