How to Calculate kVA

For single phase kVA calculations or conversions we need to know two of the three values of kVA, Volts and Amps. Calculations could be kVA from Amps and Volts, Amps from kVA and Volts or Volts from kVA and Amps.

For three phase kVA calculations we also need to know the Power Factor and kW values.

There are a number of kVA formulas which maybe difficult to remember them all, in which case you may like to download our kVA Calculator App.

kVA Single Phase Calculations

kVA to Amps Formula

To convert kVA to Amps we use this formula (single phase)

Amps =  kVA  x 1000 / Volts
Example: If kVA = 4.6 and voltage = 230 then the calculation would be 4.6 x 1000  / 230 = 20 Amps

Amps to kVA Formula

To convert Amps to kVA we use this formula (single phase)

​kVA = Amps x  Volts / 1000
Example: If amps = 15 and volts = 120 the calculation would be 15 x 120 / 1000 = 1.8 kVA

Volts to kVA Formula

To calculate the voltage from kVA there is this formula (single phase)

Volts = kVA x 1000 / Amps
​Example: If kVA = 40 and amps = 10 then the calculation is 40 x 1000 x 10 = 4000 volts

kVA Three Phase Calculations

Three Phase kVA to Amps Calculation

Calculating Amps from kVA Three Phase

Amps =  kVA /  Volts / 1.732 x 1000
Example: If kVA = 50 and volts= 400 then the calculation would be 50  / 400 / 1.732 * 1000 =  72.17 Amps

Three Phase Amps to kVA Calculation

Calculating Three Phase kVA from Amps formula

​kVA = Amps x Volts x 1.732 / 1000
Example: So if Amps = 25 and volts = 400 then 25 x 400 x 1.732 / 1000 =  17.32 kVA

Three Phase Volts to kVA Calculation

Calculating Three Phase Volts from kVA formula

Volts = kVA / Amps / 1.732 x 1000
Example: So if kVA= 32 and amps = 63 then the calculation would be 32 / 63 / 1.732 x 100 =  293 Amps

 

kVA to kW to Power Factor Formula

To calculate to or from kVA, kW or Power Factor (PF) we have the following calculations

kVA = kW / Power Factor
Example: If kW = 5 and Power Factor = 0.8 then 5 / 0.8 = 6.25 kVA

kW = kVA x Power Factor
Example: If kVA = 14 and Power Factor = 0.7 then 14 x 0.7 = 9.8 kW

PF = kW / kVA
Example: If kW = 15 and kVA = 25 then 15 / 25 = 0.6 Power Factor

http://kVA%20Calculator

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