kW and kVA are units of power. kW stands for kilo-watts and kVA stands for kilo-volts ampere. Let’s see what is the difference between kW and kVA and how to calculate each one of them.

## The key differences between kW and kVA

kW – Kilowatts | kVA – Kilo-volt amperes |
---|---|

It is the unit of electric power – In AC system, it is the unit of measure of true power or useful power. | kVA is the unit of apparent power in an AC electric system. |

It is basically the measure of true power consumed by the load. | kVA is basically the amount of power that alternators, transformers and UPS are capable of delivering the load connected to them. |

Kilowatts is proportional to load power factor. | kVA is independent of load power factor. |

Motors, lamps, home appliances etc are rated in kW. | Alternators, transformers, inverters, UPS etc are rated in kVA. |

The below pictures shows the nameplate details of an induction motor that is rated in kW and a transformer rated in kVA.

## Calculation of kW – True Power

### Single phase kilowatts,

For single-phase, kW can be calculated using the following formula.

Single-phase – kW = (Voltage X Current X Power factor)/1000

### Three-phase kilowatts

For three-phase, kW can be calculated using the following formula.

Three phase kW if **line-to-line voltage** is known,

kW = (√3 X Voltage X Current X Power factor)/1000

= (1.732 X Voltage X Current X Power factor)/1000

Three phase kW if **phase-to-phase voltage** is known,

kW = (3 X Voltage X Current X Power factor)/1000

## Calculation of kVA – Apparent power

### Single-phase kVA

For single-phase, kVA can be calculated using the following formula.

kVA = (Voltage X Current)/1000

### Three-phase kVA

For three-phase, kVA can be calculated using the following formula.

Three-phase kVA if **line-to-line voltage** is known,

kVA = (√3 X Voltage X Current )/1000 = (1.732 X Voltage X Current)/1000

Three-phase kVA if **phase-to-phase voltage** is known,

kVA = (3 X Voltage X Current)/1000

### How to convert kilo-volt-ampere to kilowatt?

To convert kVA to kW, multiply the KVA by the power factor of the circuit.

kW = KVA X P.F(Power factor)

### How to convert kW to kVA?

To convert kW to kVA, divide the KVA by the power factor of the load.

kW = KVA / P.F(Power factor)

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