How many kilojoules are in one watt-hour?
One watt-hour equals exactly 3.6 kilojoules.
Convert Watt-hour (Wh) to Kilojoule (kJ) instantly.
Calculation
value × 3.6
| Quick Conversion | Converted |
|---|---|
| 1 Wh | 3.6 kJ |
| 5 Wh | 18 kJ |
| 10 Wh | 36 kJ |
| 100 Wh | 360 kJ |
| 1,000 Wh | 3,600 kJ |
A watt-hour is the energy delivered by one watt of power over one hour.
Watt-hours became a practical electrical unit for describing energy use and storage over time.
Wh is used for batteries, electronics, chargers, portable power stations, solar devices, and energy-use estimates.
A kilojoule is an SI energy unit equal to 1000 joules.
Kilojoules became common as a readable SI scale for energy values larger than a few joules.
kJ is used in physics, nutrition, heat transfer, mechanical work, engineering notes, and scientific energy summaries.
Mathematically, kilojoule (kJ) = watt-hour (Wh) converted with the formula below.
1 Wh = 3.6 kJ
1 kJ = 0.277778 Wh
Formula: value × 3.6
Example: 15 Wh = 54 kJ
Precision note: Use 1 Wh = 3.6 kJ exactly. Practical device performance can differ from the converted ideal energy because of voltage limits and efficiency losses.
1 Wh = 3.6 kJ
1 kJ = 0.277778 Wh
| Watt-hour [Wh] | Kilojoule [kJ] |
|---|---|
| 0.01 Wh | 0.036 kJ |
| 0.1 Wh | 0.36 kJ |
| 1 Wh | 3.6 kJ |
| 2 Wh | 7.2 kJ |
| 5 Wh | 18 kJ |
| 10 Wh | 36 kJ |
| 20 Wh | 72 kJ |
| 50 Wh | 180 kJ |
| 100 Wh | 360 kJ |
One watt-hour equals exactly 3.6 kilojoules.
10 Wh equals 36 kJ.
Yes. The relationship follows from 1 watt being 1 joule per second and one hour having 3600 seconds.