Electrical & Controls
Power factor correction (kVAR) calculator
Capacitor kVAR needed to raise power factor to a target.
Calculating…
How it's calculated
kVAR = P × (tan φ1 − tan φ2)
φ = arccos(PF)
Correcting power factor cuts the current your supply carries for the same real power. That frees transformer and cable capacity and can avoid reactive power charges on your bill.
Most suppliers penalise below about 0.95. Correcting all the way to 1.0 is rarely worthwhile and risks over-correction at light load. Check for harmonics (VFDs, rectifiers) before fitting capacitors, as detuned banks may be needed.