How to convert watts to kVA

How to convert real power in watts (W) to apparent power in kilovolt-amps (kVA).

Watts to kVA calculation formula

The apparent power S in kilovolt-amps (kVA) is equal to the real power P in watts (W), divided by 1000 times the power factor PF:

S(kVA) =  P(W) / (1000 × PF)

So kilovolt-amps are equal to watts divided by 1000 times the power factor.

kilovolt-amps = watts / (1000 × PF)


kVA = W / (1000 × PF)


What is the apparent power in kilovolt-amps when the real power is 3000W and the power factor is 0.8?


S = 3000W / (1000 × 0.8) = 3.75kVA

Watt 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

Kilovolt-ampere definition

kVA is kilo-volt-ampere. kVA is a unit of apparent power, which is electrical power unit.

1 kilo-volt-ampere is equal to 1000 volt-ampere:

1kVA = 1000VA

1 kilo-volt-ampere is equal to 1000 times 1 volt times 1 ampere:

1kVA = 1000⋅1V⋅1A

How to convert kVA to watts »

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