How to convert kilojoules to kilowatt-hours
kWh = kJ × 0.0002777777778Because one kilowatt-hour equals 3,600 kilojoules, you can also divide: kWh = kJ ÷ 3,600.
A kilojoule is smaller than a kilowatt-hour: it takes 3,600 kilojoules to make one kilowatt-hour.
Worked examples
- 1 kilojoule1 kJ × 0.0002777777778 = 0.0002777777778 kWh
- 5 kilojoules5 kJ × 0.0002777777778 = 0.001388888889 kWh
- 10 kilojoules10 kJ × 0.0002777777778 = 0.002777777778 kWh
- 20 kilojoules20 kJ × 0.0002777777778 = 0.005555555556 kWh
- 100 kilojoules100 kJ × 0.0002777777778 = 0.02777777778 kWh
Kilojoules to kilowatt-hours conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Kilojoules (kJ) | Kilowatt-hours (kWh) |
|---|---|
| 0.1 kJ | 0.000027777778 kWh |
| 0.25 kJ | 0.000069444444 kWh |
| 0.5 kJ | 0.00013888889 kWh |
| 1 kJ | 0.00027777778 kWh |
| 2 kJ | 0.00055555556 kWh |
| 3 kJ | 0.00083333333 kWh |
| 4 kJ | 0.0011111111 kWh |
| 5 kJ | 0.0013888889 kWh |
| 6 kJ | 0.0016666667 kWh |
| 7 kJ | 0.0019444444 kWh |
| 8 kJ | 0.0022222222 kWh |
| 9 kJ | 0.0025 kWh |
| 10 kJ | 0.0027777778 kWh |
| Kilojoules (kJ) | Kilowatt-hours (kWh) |
|---|---|
| 12 kJ | 0.0033333333 kWh |
| 15 kJ | 0.0041666667 kWh |
| 20 kJ | 0.0055555556 kWh |
| 25 kJ | 0.0069444444 kWh |
| 30 kJ | 0.0083333333 kWh |
| 40 kJ | 0.011111111 kWh |
| 50 kJ | 0.013888889 kWh |
| 75 kJ | 0.020833333 kWh |
| 100 kJ | 0.027777778 kWh |
| 250 kJ | 0.069444444 kWh |
| 500 kJ | 0.13888889 kWh |
| 1,000 kJ | 0.27777778 kWh |
About the units
Kilojoule (kJ)
One thousand joules. Food labels in Australia and the EU list energy in kJ alongside kcal. One kilojoule equals 1,000 joules (J).
Kilowatt-hour (kWh)
Exactly 3.6 MJ. The unit on electricity bills; running a 1,000 W heater for an hour uses 1 kWh. One kilowatt-hour equals 3,600,000 joules (J).
Frequently asked questions
How many kilowatt-hours are in one kilojoule?
There are 0.0002777777778 kilowatt-hours in one kilojoule, and this value is exact by definition.
How do I convert kilojoules to kilowatt-hours?
Multiply the number of kilojoules by 0.0002777777778. For example, 10 kJ × 0.0002777777778 = 0.002777777778 kWh.
How many kilojoules are in one kilowatt-hour?
One kilowatt-hour equals 3,600 kilojoules. That is the reverse factor, 1 ÷ 0.0002777777778.
What is 10 kilojoules in kilowatt-hours?
10 kJ = 0.002777777778 kWh.
Is this kJ to kWh converter accurate?
Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.