How to convert kilowatt-hours to kilojoules
To convert kilowatt-hours (kWh) to kilojoules (kJ), multiply the value in kilowatt-hours by 3,600.
kJ = kWh × 3,600
Example: 5 kWh = 18,000 kJ.
You can also type 5 kWh to kJ into the smart calculator, or mix units: 1 kWh + 1 kJ.
Kilowatt-Hours to Kilojoules conversion table
| Kilowatt-Hours | Kilojoules |
|---|---|
| 0.01 kWh | 36 kJ |
| 0.1 kWh | 360 kJ |
| 0.25 kWh | 900 kJ |
| 0.5 kWh | 1,800 kJ |
| 1 kWh | 3,600 kJ |
| 2 kWh | 7,200 kJ |
| 3 kWh | 10,800 kJ |
| 4 kWh | 14,400 kJ |
| 5 kWh | 18,000 kJ |
| 6 kWh | 21,600 kJ |
| 7 kWh | 25,200 kJ |
| 8 kWh | 28,800 kJ |
| 9 kWh | 32,400 kJ |
| 10 kWh | 36,000 kJ |
| 12 kWh | 43,200 kJ |
| 15 kWh | 54,000 kJ |
| 20 kWh | 72,000 kJ |
| 25 kWh | 90,000 kJ |
| 30 kWh | 108,000 kJ |
| 40 kWh | 144,000 kJ |
| 50 kWh | 180,000 kJ |
| 60 kWh | 216,000 kJ |
| 75 kWh | 270,000 kJ |
| 100 kWh | 360,000 kJ |
| 250 kWh | 900,000 kJ |
| 500 kWh | 1,800,000 kJ |
| 1,000 kWh | 3,600,000 kJ |
Converting kilojoules back to kilowatt-hours
1 kJ = 0.0002777777778 kWh. See the Kilojoules to Kilowatt-Hours converter, or press the swap button above.
About the units
Kilowatt-hour (kWh)
Exactly 3.6 megajoules: the "unit" on an electricity bill.
Kilojoule (kJ)
One thousand joules. Food labels in Australia and Europe show kJ alongside kcal.
Energy is the capacity to do work. The SI unit is the joule. Food energy is labelled in kilocalories (Calories with a capital C) or kilojoules, electricity is billed in kilowatt-hours, and heating often uses BTU or therms.
Questions and answers
How many kilojoules are in a kilowatt-hour?
One kilowatt-hour (kWh) equals 3,600 kilojoules (kJ).
How do I convert kilowatt-hours to kilojoules?
To convert kilowatt-hours to kilojoules, multiply the value in kilowatt-hours by 3,600. The formula is kJ = kWh × 3,600. For example, 5 kWh = 18,000 kJ.
What is 5 kWh in kJ?
5 kilowatt-hours is 18,000 kilojoules.
Which is bigger, a kilowatt-hour or a kilojoule?
A kilowatt-hour is bigger: 1 kWh = 3,600 kJ.
Are Calories on food labels the same as calories?
No. The food Calorie (capital C) is a kilocalorie: 1,000 small calories, or 4.184 kilojoules.
Does this kWh to kJ converter work offline?
Yes. ConvertEasy is a progressive web app: after your first visit it keeps working with no connection, and you can install it to your home screen from the browser menu.