Convert Watt Hours to Kilojoules
1 watt hour = 3.6 kilojoules. Type any value below to convert in either direction — the calculation happens in your browser.
Watt Hours to Kilojoules formula
Multiply the number of watt hours by 3.6 to get kilojoules.
kilojoules = watt hours × 3.6To go the other way: divide the number of kilojoules by 3.6, or multiply by 0.2777778.
watt hours = kilojoules ÷ 3.6Watt Hours to Kilojoules conversion table
| Watt Hours | Kilojoules |
|---|---|
| 1 Wh | 3.6 kJ |
| 2 Wh | 7.2 kJ |
| 3 Wh | 10.8 kJ |
| 4 Wh | 14.4 kJ |
| 5 Wh | 18 kJ |
| 6 Wh | 21.6 kJ |
| 7 Wh | 25.2 kJ |
| 8 Wh | 28.8 kJ |
| 9 Wh | 32.4 kJ |
| 10 Wh | 36 kJ |
| 15 Wh | 54 kJ |
| 20 Wh | 72 kJ |
| 25 Wh | 90 kJ |
| 30 Wh | 108 kJ |
| 40 Wh | 144 kJ |
| 50 Wh | 180 kJ |
| 75 Wh | 270 kJ |
| 100 Wh | 360 kJ |
| 250 Wh | 900 kJ |
| 500 Wh | 1,800 kJ |
| 1,000 Wh | 3,600 kJ |
Kilojoules to Watt Hours conversion table
| Kilojoules | Watt Hours |
|---|---|
| 1 kJ | 0.2777778 Wh |
| 2 kJ | 0.5555556 Wh |
| 3 kJ | 0.8333333 Wh |
| 4 kJ | 1.111111 Wh |
| 5 kJ | 1.388889 Wh |
| 6 kJ | 1.666667 Wh |
| 7 kJ | 1.944444 Wh |
| 8 kJ | 2.222222 Wh |
| 9 kJ | 2.5 Wh |
| 10 kJ | 2.777778 Wh |
About the watt hour
A watt hour is the energy of one watt sustained for one hour, equal to 3,600 joules.
About the kilojoule
A kilojoule is 1,000 joules and is how food energy is labelled in most of the world.
Frequently asked questions
How many kilojoules are in a watt hour?
There are 3.6 kilojoules in one watt hour.
How many watt hours are in a kilojoule?
There are 0.2777778 watt hours in one kilojoule.
Is this conversion exact?
The ratio between the watt hour and the kilojoule is fixed by definition, so the conversion is exact — the figures shown here are rounded for readability only.
What is 10 watt hours in kilojoules?
10 watt hours equals 36 kilojoules.
Related energy conversions
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