# How to convert kilojoules to watts

How to convert energy in kilojoules (kJ) to electric power in watts (W).

You can calculate watts from kilojoules and seconds, but you can't convert kilojoules to watts, since kilojoule and watt units represent different quantities.

### Kilojoules to watts calculation formula

The power P in watts (W) is equal to 1000 times the energy E in kilojoules (kJ), divided by the time period t in seconds (s):

P(W) = 1000 × E(kJ) / t(s)

So

watt = 1000 × kilojoule / second

or

W = 1000 × kJ / s

#### Example

What is the power consumption of an electrical circuit that has energy consumption of 9 kilojoules for time duration of 3 seconds?

P(W) = 1000 × 9kJ / 3s = 3000W

## Watt (W) definition

Watt is the unit of power (symbol: W).

The watt unit is named after James Watt, the inventor of the steam engine.

One watt is defined as the energy consumption rate of one joule per second.

1W = 1J / 1s

One watt is also defined as the current flow of one ampere with voltage of one volt.

1W = 1V × 1A

## Kilojoule (kJ) definition

Kilojoule is a unit of energy that is equal to 1000 joules.

1 kilojoule is equal to 1000 joules:

1kJ = 1000J

1 joule is equal to 1/1000 kilojoule:

1J = 0.001kJ

The energy E(J) in joules (J) is equal to the energy E(kJ) in kilojoules times 1000:

E(J) = E(kJ) × 1000

1 kilojoule is equal to 0.94781712 BTU(IT):

1 kJ = 0.94781712 BTU(IT)

The energy E(BTU) in BTUs is equal to 0.94781712 times the energy E(kJ) in kilojoules (kJ):

E(BTU) = E(kJ) / 1.05505585262 = 0.94781712 ⋅ E(kJ)

1 kcalth is equal to 4.184 kilojoules (kJ):

1 kcalth = 4.184 kJ

The energy in kilojoules E(kJ) is equal to the energy in kilocalories E(kcal-th) divided by 4.184:

E(kcal) = E(kJ) / 4.184

How to convert watts to kJ »

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