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.
When you’ll use the kilowatt-hour to kilojoule conversion
Converting kilowatt hours to kilojoules comes up more often than you might expect — for example when comparing fuel and battery capacities, understanding your electricity bill in kWh, or comparing food energy in kcal and kJ. Type your number once and you get the exact answer plus every related unit, so you don’t need to convert twice.
💡 The factor is exact and easy to remember: 1 kWh = 3,600 kJ.
Watch out for these mix-ups
- Food “Calories” are kilocalories (kcal), not small calories.
- kW is power (a rate); kWh is energy (an amount).
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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