How to Calculate kVA

To kVA calculate we need to know two of the three values of kVA, Volts 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, in which case you may like to download our kVA Calculator App for iOS and Android.

Three Phase kVA Calculations

This section explains how to carry out three phase kVA calculations.

Three Phase kVA to Amps

To convert kVA to Amps three phase we can use this formula Amps =  kVA /  Volts / 1.732 x 1000
For example, if kVA = 50 and volts= 400 then the calculation is  50  (kVA) / 400 (V) / 1.732 * 1000 =  72.17 Amps

Three Phase Amps to kVA

To calculate Three Phase kVA from Amps the formula is kVA = Amps x Volts x 1.732 / 1000
For example, if Amps = 25 and volts = 400 then the calculation is 25 (A) x 400 (V) x 1.732 / 1000 =  17.32 kVA

kVA to kW to Power Factor

To calculate to or from kVA, kW or Power Factor there are the following calculations,

kVA = kW / Power Factor
For example, if kW = 5 and Power Factor = 0.8 then kVA =  5 (kW) / 0.8 (PF) = 6.25 kVA.

kW = kVA x Power Factor
For example, if kVA = 14 and Power Factor = 0.7 then kW = 14 (kVA) x 0.7 (PF) = 9.8 kW.

Power Factor = kW / kVA
For example, if kW = 15 and kVA = 25 then Power Factor = 15 (kW) / 25 (kVA)= 0.6 PF.