Usha Electric – Energy Management Solutions

kVAr Calculator

Calculation of Power Factor

kVAr Calculator

The following formula calculates power factor (PF) based on KW and KVA or KW and KVAr. Input Load KW and Load KVA into Calculator-1, or Load KW and Load KVAr into Calculator-2, below to calculate Load Power Factor, Power Factor Angle, Load KVAr and Load KVA. After inputting the first two variables, the required kVAr (Capacitors added) to correct the load to a desired power factor can be calculated along with a Compensated KVA and total Reduction in KVA. Note that KW will remain constant when correcting power factor by adding capacitors. The KVA Reduction is what would be expected when adding power factor correction capacitors.

Input Section

  Maximum Load (kW)


Existing Power Factor (Lag) cos Ø 1    

Desired Power Factor (Lag) cos Ø 2     

Operating Voltage

  Press Calculate Button after filling data in Input Section

Output Section

MD at existing P.F. (kVA)

MD at improved P.F. (kVA)

Saving in MD (kVA)

KVAr at existing P.F. (kVAr)

KVAr at improved P.F. (kVAr)

KVAr required (kVAr)

Load Current at existing P.F. (Amps)

Load Current at improved P.F. (Amps)

Reduction in Load Current (Amps)

 note : cos Ø 1 and cos Ø 2 must be more than zero, less than one