How to convert kilowatt hours to joules
To convert kilowatt hours to joules, multiply by 3,600,000. Energy conversions connect nutrition, electricity bills, heating systems and physics.
Kilowatt-hour to Joule conversion table
| Kilowatt-hour (kWh) | Joule (J) |
|---|---|
| 0.1 kWh | 360,000 J |
| 0.5 kWh | 1,800,000 J |
| 1 kWh | 3,600,000 J |
| 2 kWh | 7,200,000 J |
| 3 kWh | 10,800,000 J |
| 4 kWh | 14,400,000 J |
| 5 kWh | 18,000,000 J |
| 10 kWh | 36,000,000 J |
| 20 kWh | 72,000,000 J |
| 25 kWh | 90,000,000 J |
| 50 kWh | 180,000,000 J |
| 100 kWh | 360,000,000 J |
| 500 kWh | 1,800,000,000 J |
| 1,000 kWh | 3,600,000,000 J |
About the units
Kilowatt-hour (kWh)
A kilowatt-hour equals 3.6 million joules and is the unit on electricity bills.
Joule (J)
The joule is the SI unit of energy, the work done by one newton over one meter.
How to use this converter
- Type the number of kilowatt hours (kWh) in the input box.
- The result in joules appears instantly — no button needed.
- See the same value in every other energy unit just below.
- Use “Swap units” to convert joules back to kilowatt hours.
When you’ll use the kilowatt-hour to joule conversion
Converting kilowatt hours to joules 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 = 3,600,000 J.
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 joules are in one kilowatt-hour?
One kilowatt-hour equals 3,600,000 joules. 3,600,000 is the exact factor used by this converter.
How do I convert kilowatt hours to joules?
Multiply the value in kilowatt hours by 3,600,000. To go the other way, multiply joules by 2.77777778e-7.
What is 10 kWh in J?
10 kWh = 36,000,000 J. Also, 5 kWh = 18,000,000 J and 100 kWh = 360,000,000 J.
What is the difference between a kilowatt-hour and a joule?
A kilowatt-hour equals 3.6 million joules and is the unit on electricity bills. The joule is the SI unit of energy, the work done by one newton over one meter.
Is this tool free and private?
Yes — the Kilowatt-hour to Joule 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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