Convert kWh to kJ
Input the number of kilowatt-hours you want to convert to kilojoules.
How to Convert Kilowatt-hours to Kilojoules
The kilowatt-hour and kilojoule are both units of energy. By definition, 1 kilowatt-hour equals exactly 3600 kilojoules. This means to convert kilowatt-hours to kilojoules, you multiply by 3600.
Formula
Step-by-Step Example
Convert 5 kWh to kilojoules:
We need to convert kilowatt-hours to kilojoules
Since 1 kWh = 3600 kJ, multiply by 3600
5 × 3600 = 18000
5 kWh = 18000 kJ
Kilowatt-hour to Kilojoule Conversion Table
Quick reference table for common kilowatt-hour to kilojoule conversions. Click any value for detailed calculation.
| Kilowatt-hours (kWh) | Kilojoules (kJ) |
|---|---|
| 0.1 kWh | 360 kJ |
| 0.5 kWh | 1800 kJ |
| 1 kWh | 3600 kJ |
| 2 kWh | 7200 kJ |
| 5 kWh | 18000 kJ |
| 10 kWh | 36000 kJ |
| 25 kWh | 90000 kJ |
| 50 kWh | 180000 kJ |
| 100 kWh | 360000 kJ |
About These Units
Kilowatt-hour (kWh)
A kilowatt-hour (kWh) is the standard unit for electricity billing, equal to 1,000 watt-hours or 3.6 megajoules. Average US home uses 900 kWh monthly. Running a 100W bulb for 10 hours uses 1 kWh. Electricity costs $0.10-0.30 per kWh typically.
Kilojoule (kJ)
A kilojoule (kJ) equals 1,000 joules or approximately 239 calories. Kilojoules measure food energy on nutrition labels in Australia, Europe, and many countries. An average adult needs 8,400-10,000 kJ daily. One kJ equals approximately 0.239 kcal.
Frequently Asked Questions
How do I convert kilowatt-hours to kilojoules?
To convert kilowatt-hours to kilojoules, multiply the value by 3600. For example, 10 kWh = 36000 kJ.
How many kilojoules are in 1 kilowatt-hour?
1 kilowatt-hour equals 3600 kilojoules.
What is the formula for kilowatt-hours to kilojoules?
The formula is: kJ = kWh × 3600.