Convert Kilojoule to Watt Hour
Use this free converter to change kilojoules (kJ) into watt hours (Wh). Kilojoule and watt hour both measure energy. As a quick reference, 1 kJ equals 0.27777778 Wh, and 1 Wh equals 3.6 kJ.
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Watt Hour (Wh)
0.27777778
1 kJ = 0.27777778 Wh
Energy conversion table
| Kilojoule | Watt Hour |
|---|---|
| 0.01 | 0.0027777778 |
| 0.1 | 0.027777778 |
| 0.5 | 0.13888889 |
| 1 | 0.27777778 |
| 2 | 0.55555556 |
| 3 | 0.83333333 |
| 5 | 1.3888889 |
| 10 | 2.7777778 |
| 20 | 5.5555556 |
| 25 | 6.9444444 |
| 50 | 13.888889 |
| 100 | 27.777778 |
| 1,000 | 277.77778 |
How to convert Kilojoule to Watt Hour
Multiply the kilojoule value by 0.27777778 to get watt hours.
- Enter the number of kilojoules you want to convert.
- The converter instantly shows the equivalent value in watt hours.
- Worked example: 15 kJ × 0.27777778 = 4.1666667 Wh.
- Use the swap button to reverse the conversion (watt hour to kilojoule).
About these units
Kilojoule (kJ)
- Definition
- A kilojoule (kJ) is 1,000 joules, a practical size for food energy and mechanical work.
- History
- It is a metric multiple of the joule.
- Current use
- Kilojoules express food energy on nutrition labels in many countries.
Watt Hour (Wh)
- Definition
- A watt-hour (Wh) is the energy of one watt sustained for one hour, equal to 3,600 joules.
- History
- It arose with the electricity industry as a practical billing unit.
- Current use
- Watt-hours rate batteries and small energy stores.
Frequently asked questions
How many watt hours are in a kilojoule?
There are 0.27777778 Wh in 1 kJ. To convert, multiply the number of kilojoules by 0.27777778.
How do I convert kilojoules to watt hours?
Multiply the kilojoule value by 0.27777778 to get watt hours. For example, 10 kJ = 2.7777778 Wh.
Is this kilojoule-to-watt hour converter free?
Yes. This converter is completely free, runs entirely in your browser, and requires no sign-up. Your inputs never leave your device.
Convert Kilojoule to other energy units
| Unit | 1 Kilojoule equals |
|---|---|
| Joule (J) | 1000 J |
| Calorie (cal) | 239.00574 cal |
| Kilocalorie (kcal) | 0.23900574 kcal |
| Watt Hour (Wh) | 0.27777778 Wh |
| Kilowatt Hour (kWh) | 0.00027777778 kWh |
| Electronvolt (eV) | 6.2415e+21 eV |
| British Thermal Unit (BTU) | 0.94781712 BTU |
| Foot-Pound (ft·lb) | 737.56215 ft·lb |