Convert kilowatt hour to kilojoule
Here you can quickly calculate how many kilojoule fit in one kilowatt hour.
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- 1 kWh = 3600 kJ
- 1 kJ = 0.000278 kWh
Example: kilowatt hour to kilojoule
- 1 kilowatt hour = 3600 kilojoule
Kilowatt hour to kilojoule conversion table
| kilowatt hour | kilojoule |
|---|---|
| 1 | 3600 |
| 2 | 7200 |
| 5 | 18000 |
| 10 | 36000 |
| 20 | 72000 |
| 50 | 180000 |
| 100 | 360000 |
Kilowatt hour to kilojoule formula
To convert kilowatt hour to kilojoule, multiply by 3600.
1 kWh = 3600 kJ
Example: 1 kilowatt hour = 3600 kilojoule
Common energy conversion mistakes
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Kilowatts (kW) and kilowatt-hours (kWh) are constantly confused: kW is power, how fast energy is being used right now, while kWh is an amount of energy, power times time. A 2 kW heater running for 3 hours uses 2 × 3 = 6 kWh. Your electricity bill counts kWh; your main fuse limits kW.
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The relationship is exact: 1 kWh = 3.6 MJ (3,600 kJ, because an hour has 3,600 seconds). The common slip is dividing when you should multiply: 10 kWh is 36 MJ, not 2.8. Remember the direction: kWh → MJ means times 3.6.
Quick kilowatt hour and kilojoule conversion quiz
Score:
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25 kilojoule equals 0.0347 kilowatt hour.
Correct answer: 25 kilojoule = 0.00694 kilowatt hour.
10 kilowatt hour equals 7.2e+3 kilojoule.
Correct answer: 10 kilowatt hour = 3.6e+4 kilojoule.
2 kilowatt hour equals 7.2e+3 kilojoule.
Correct answer: 2 kilowatt hour = 7.2e+3 kilojoule.
100 kilojoule equals 0.139 kilowatt hour.
Correct answer: 100 kilojoule = 0.0278 kilowatt hour.