How to convert kilowatt hours to kilojoules
To convert kilowatt hours to kilojoules, multiply by 3,600. Energy conversions connect nutrition, electricity bills, heating systems and physics.
Kilowatt-hour to Kilojoule conversion table
| Kilowatt-hour (kWh) | Kilojoule (kJ) |
|---|---|
| 0.1 kWh | 360 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 |
| 10 kWh | 36,000 kJ |
| 20 kWh | 72,000 kJ |
| 25 kWh | 90,000 kJ |
| 50 kWh | 180,000 kJ |
| 100 kWh | 360,000 kJ |
| 500 kWh | 1,800,000 kJ |
| 1,000 kWh | 3,600,000 kJ |
About the units
Kilowatt-hour (kWh)
A kilowatt-hour equals 3.6 million joules and is the unit on electricity bills.
Kilojoule (kJ)
A kilojoule is 1,000 joules and appears on food labels in many countries.
How to use this converter
- Type the number of kilowatt hours (kWh) in the input box.
- The result in kilojoules appears instantly — no button needed.
- See the same value in every other energy unit just below.
- Use “Swap units” to convert kilojoules back to kilowatt hours.
Tips for better results
- Double-check which system a unit belongs to (for example US vs UK gallons).
- Use the swap button to convert in the opposite direction instantly.
- Bookmark the conversions you use most — each pair has its own page.
Frequently asked questions
How many kilojoules are in one kilowatt-hour?
One kilowatt-hour equals 3,600 kilojoules. 3,600 is the exact factor used by this converter.
How do I convert kilowatt hours to kilojoules?
Multiply the value in kilowatt hours by 3,600. To go the other way, multiply kilojoules by 0.000277777777778.
What is 10 kWh in kJ?
10 kWh = 36,000 kJ. Also, 5 kWh = 18,000 kJ and 100 kWh = 360,000 kJ.
What is the difference between a kilowatt-hour and a kilojoule?
A kilowatt-hour equals 3.6 million joules and is the unit on electricity bills. A kilojoule is 1,000 joules and appears on food labels in many countries.
Is this tool free and private?
Yes — the Kilowatt-hour to Kilojoule is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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