Convert kilojoules to kilowatt-hours
Enter a value in kilojoules (kJ) to get kilowatt-hours (kWh). One kilojoule is 0.00027778 kilowatt-hours; one kilowatt-hour is 3,600 kilojoules.
How to use the Kilojoule to kilowatt-hour
- Type the number of kilojoules.
- Click Convert.
- Read the result in kilowatt-hours, plus the same value in every other energy unit.
kJ to kWh formula
kilowatt-hours = kilojoules × 0.00027778. To go the other way, kilojoules = kilowatt-hours × 3,600 (see kilowatt-hours to kilojoules).
Worked example
12 kJ × 0.00027778 = 0.003333 kWh.
Kilojoules to kilowatt-hours conversion table
| Kilojoules | Kilowatt-hours |
|---|---|
| 0.1 kJ | 0.00002778 kWh |
| 0.5 kJ | 0.00013889 kWh |
| 1 kJ | 0.00027778 kWh |
| 2 kJ | 0.00055556 kWh |
| 3 kJ | 0.00083333 kWh |
| 5 kJ | 0.001389 kWh |
| 10 kJ | 0.002778 kWh |
| 20 kJ | 0.005556 kWh |
| 25 kJ | 0.006944 kWh |
| 50 kJ | 0.013889 kWh |
| 100 kJ | 0.027778 kWh |
| 250 kJ | 0.069444 kWh |
| 500 kJ | 0.138889 kWh |
| 1,000 kJ | 0.277778 kWh |
About the kilojoule
Food energy on labels in Australia, New Zealand and Europe (alongside kcal).
About the kilowatt-hour
The electricity billing unit: 1,000 W for one hour. Also EV battery capacity.
Related conversions
kilowatt-hours to kilojoules · kilojoules to kilocalories · any unit.
Frequently asked questions
How many kilowatt-hours in a kilojoule?
0.00027778 kilowatt-hours.
How many kilojoules in a kilowatt-hour?
3,600 kilojoules.
Is the factor exact?
The factor 0.00027778 is derived from the units' exact definitions; only the display is rounded.
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Last updated 2026-09-23.