Watt-hours to kilojoules converter
Kilojoules (kJ)
1 watt-hour = 3.6 kilojoules
How to convert watt-hours to kilojoules
kJ = Wh × 3.6
Multiply the number of watt-hours by 3.6 to get kilojoules. Going the other way, divide by 3.6 (or multiply by 0.277777777778).
One watt-hour is exactly defined as 3.6 kilojoules (to 12 significant figures), and one kilojoule is 0.277777777778 watt-hours.
Worked examples
- Convert 5 watt-hours: 5 × 3.6 = 18 18 kilojoules.
- Convert 12.5 watt-hours: 12.5 × 3.6 = 45 45 kilojoules.
- Convert 250 watt-hours: 250 × 3.6 = 900 900 kilojoules.
Quick-reference table
| Wh | kJ |
|---|---|
| 1 | 3.6 |
| 2 | 7.2 |
| 3 | 10.8 |
| 5 | 18 |
| 10 | 36 |
| 15 | 54 |
| 20 | 72 |
| 25 | 90 |
| 50 | 180 |
| 75 | 270 |
| 100 | 360 |
| 1,000 | 3,600 |
| kJ | Wh |
|---|---|
| 1 | 0.2777777778 |
| 2 | 0.5555555556 |
| 3 | 0.8333333333 |
| 5 | 1.388888889 |
| 10 | 2.777777778 |
| 15 | 4.166666667 |
| 20 | 5.555555556 |
| 25 | 6.944444444 |
| 50 | 13.88888889 |
| 75 | 20.83333333 |
| 100 | 27.77777778 |
| 1,000 | 277.7777778 |
Related conversions
Frequently asked questions
How many kilojoules are in 1 watt-hour?
1 watt-hour equals 3.6 kilojoules.
What is the formula to convert watt-hours to kilojoules?
Use kJ = Wh × 3.6. Multiply the number of watt-hours by 3.6 to get kilojoules. Going the other way, divide by 3.6 (or multiply by 0.277777777778).
What is 100 watt-hours in kilojoules?
100 watt-hours is 360 kilojoules.