Wh to kJ
Convert Watt-hour to Kilojoule
Convert Watt-hour to Kilojoule instantly with the tool above. The conversion factor is 3.6, meaning 1 watt-hour equals 3.6 kilojoules. Type any value and the result updates immediately — no ads, no page reloads, no clutter.
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1 Watt-hour = 3.6 kilojoules
1 Kilojoule = 0.27777778 watt-hours
Quick reference
Common watt-hours converted to kilojoules at a glance.
| Wh | kJ |
|---|---|
| 1 | 3.6 |
| 2 | 7.2 |
| 5 | 18 |
| 10 | 36 |
| 25 | 90 |
| 50 | 180 |
| 100 | 360 |
| 500 | 1,800 |
| 1,000 | 3,600 |
How to convert watt-hours to kilojoules
To convert a value from watt-hours to kilojoules, multiply the watt-hour value by 3.6 kilojoules. For example, 10 watt-hours × that factor = 36 kilojoules.
This watt-hour to kilojoule converter runs entirely in your browser, so results appear instantly with no page reload, no advertisements and no sign-up.
Frequently asked questions
How many kilojoules are in 1 watt-hour?+
1 watt-hour is equal to 3.6 kilojoules.
How do you convert watt-hours to kilojoules?+
To convert watt-hours to kilojoules, multiply the watt-hour value by 3.6. For example, 10 watt-hours × 3.6 = 36 kilojoules.
What is the formula to convert watt-hours to kilojoules?+
Watt-hour → Kilojoule: value × 3.6. Equivalently, 1 watt-hour = 3.6 kilojoules.
Is this Watt-hour to Kilojoule converter free to use?+
Yes. This watt-hour to kilojoule converter is completely free, works instantly in your browser, and contains no advertisements, popups or sign-up.