Convert kilowatt-hours to kilojoules
Enter a value in kilowatt-hours (kWh) to get kilojoules (kJ). One kilowatt-hour is 3,600 kilojoules; one kilojoule is 0.00027778 kilowatt-hours.
How to use the Kilowatt-hour to kilojoule
- Type the number of kilowatt-hours.
- Click Convert.
- Read the result in kilojoules, plus the same value in every other energy unit.
kWh to kJ formula
kilojoules = kilowatt-hours × 3,600. To go the other way, kilowatt-hours = kilojoules × 0.00027778 (see kilojoules to kilowatt-hours).
Worked example
12 kWh × 3,600 = 43,200 kJ.
Kilowatt-hours to kilojoules conversion table
| Kilowatt-hours | Kilojoules |
|---|---|
| 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 |
| 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 |
| 250 kWh | 900,000 kJ |
| 500 kWh | 1,800,000 kJ |
| 1,000 kWh | 3,600,000 kJ |
About the kilowatt-hour
The electricity billing unit: 1,000 W for one hour. Also EV battery capacity.
About the kilojoule
Food energy on labels in Australia, New Zealand and Europe (alongside kcal).
Related conversions
kilojoules to kilowatt-hours · kilowatt-hours to megajoules · kilowatt-hours to British thermal units · any unit.
Frequently asked questions
How many kilojoules in a kilowatt-hour?
3,600 kilojoules.
How many kilowatt-hours in a kilojoule?
0.00027778 kilowatt-hours.
Is the factor exact?
The factor 3,600 is derived from the units' exact definitions; only the display is rounded.
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Last updated 2026-09-23.