Kilowatt-hours to Kilojoules (kWh to kJ) Converter
1 kilowatt-hour equals 3600 kilojoules (kJ) — multiply kilowatt-hours by 3600 to convert. Because 1 kWh is 3,600,000 joules and a kilojoule is 1,000 joules, one kWh is exactly 3,600 kJ.
The formula
To convert kilowatt-hours to kilojoules, multiply by the exact factor:
kJ = kWh × 3600
For example, 2.5 kWh × 3600 = 9000 kJ. To reverse it, divide by 3600 (or multiply by 0.00027778).
Conversion table
| Kilowatt-hours (kWh) | Kilojoules (kJ) |
|---|---|
| 1 | 3600 |
| 2 | 7200 |
| 3 | 10800 |
| 5 | 18000 |
| 10 | 36000 |
| 25 | 90000 |
| 50 | 180000 |
| 100 | 360000 |
| 500 | 1800000 |
| 1000 | 3600000 |
How to convert online
- Type the number of kilowatt-hours in the first box.
- Read the kilojoule result instantly in the second box.
- Enter a kJ value to convert back the other way.
Use the Kilowatt-hour to Kilojoule Converter — free and instant in your browser.
Where this conversion is used
Kilowatt-hours to kilojoules is a staple of physics and engineering, where electrical energy billed in kWh must be expressed in the SI-based kilojoule for thermodynamic calculations, mechanical work comparisons, and lab reports. It also helps when comparing battery capacity or heater output stated in different units.
FAQ
How many kilojoules are in a kilowatt-hour?
One kilowatt-hour equals 3600 kilojoules. So 10 kWh is 36,000 kJ.
What is the formula to convert kWh to kJ?
Multiply the kilowatt-hour value by 3600: kJ = kWh × 3600.
How do I convert kilojoules back to kilowatt-hours?
Divide by 3600, or multiply by 0.00027778. For example, 36,000 kJ ÷ 3600 = 10 kWh.
Is the conversion exact?
Yes. 1 kWh is defined as exactly 3,600,000 joules, so the factor 3600 kJ is exact with no rounding.
Related converters
- Kilojoule to Kilowatt-hour Converter
- Kilowatt-hour to Joule Converter
- Kilowatt-hour to Calorie Converter
- Kilowatt-hour to Kilocalorie Converter
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