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Convert watt second to kilojoule

Here you can quickly calculate how many kilojoule fit in one watt second.
write a number and we convert instantly
swap direction → TWh

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  • 1 Ws = 0.001 kJ
  • 1 kJ = 1000 Ws

Example: watt second to kilojoule

  • 1 watt second = 0.001 kilojoule

Watt second to kilojoule conversion table

watt second kilojoule
1 0.001
2 0.002
5 0.005
10 0.01
20 0.02
50 0.05
100 0.1

Watt second to kilojoule formula

To convert watt second to kilojoule, divide by 1000.

1 Ws = 0.001 kJ
Example: 1 watt second = 0.001 kilojoule

Common energy conversion mistakes

  • 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 watt second and kilojoule conversion quiz

Score: 0

214 watt second equals 0.214 kilojoule.

Correct answer: 214 watt second = 0.214 kilojoule.

8.5 watt second equals 0.00425 kilojoule.

Correct answer: 8.5 watt second = 0.0085 kilojoule.

7.3 watt second equals 0.0073 kilojoule.

Correct answer: 7.3 watt second = 0.0073 kilojoule.

3.7 watt second equals 0.0037 kilojoule.

Correct answer: 3.7 watt second = 0.0037 kilojoule.

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