Convert kilojoules to watt-hours
Kilojoule (kJ) to watt-hour (Wh). One kilojoule equals 0.277778 watt-hours.
Formula
Kilojoule to watt-hour conversion table
| Kilojoules | Watt-hours | Watt-hours | Kilojoules |
|---|---|---|---|
| 1 kJ | 0.277778 Wh | 1 Wh | 3.6 kJ |
| 2 kJ | 0.555556 Wh | 2 Wh | 7.2 kJ |
| 3 kJ | 0.833333 Wh | 3 Wh | 10.8 kJ |
| 5 kJ | 1.3889 Wh | 5 Wh | 18 kJ |
| 10 kJ | 2.7778 Wh | 10 Wh | 36 kJ |
| 20 kJ | 5.5556 Wh | 20 Wh | 72 kJ |
| 50 kJ | 13.8889 Wh | 50 Wh | 180 kJ |
| 100 kJ | 27.7778 Wh | 100 Wh | 360 kJ |
| 500 kJ | 138.89 Wh | 500 Wh | 1800 kJ |
| 1000 kJ | 277.78 Wh | 1000 Wh | 3600 kJ |
To convert kilojoules to watt-hours, divide the number of kilojoules by 3.6. One kilojoule equals 0.277778 watt-hours, and one watt-hour equals 3.6 kilojoules, so the relationship is fixed and exact. As a worked example, 10 kJ comes to 2.7778 Wh. 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 kilojoule values already worked out in watt-hours, plus the reverse watt-hour to kilojoule direction, which is handy for quick reference or double-checking a result by hand.
Frequently asked questions
How many watt-hours are in a kilojoule?
One kilojoule equals 0.277778 watt-hours. The ratio is constant, so you can multiply any number of kilojoules by 0.277778 to get watt-hours.
What is the formula to convert kilojoules to watt-hours?
Use watt-hours = kilojoules ÷ 3.6. UnitGlide applies this exact formula for every value, so results stay accurate across the whole range.
How do I convert watt-hours back to kilojoules?
Go the other way by using one watt-hour equals 3.6 kilojoules. You can also press the swap button in the converter above to flip the direction in one click.
Is this kilojoule to watt-hour 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.