3-Phase Power Calculator
Calculates voltage, current, real power (kW), apparent power (kVA), and reactive power (kVAR) in 3-phase systems.
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Additional Info
Standard IEEE/IEC 3-phase formulas. For motor loads, use actual motor nameplate FLA if available.
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How to Use This Calculator
1. Choose what to solve for. Select Power (kW/kVA), Current (Amps), or Voltage based on what you need to find.
2. Enter the known values. For power calculation, enter voltage and current. For current calculation, enter voltage and power (kW). The power factor defaults to 0.85 for typical motor loads.
3. Review all results. The calculator shows apparent power (kVA), real power (kW), reactive power (kVAR), line and phase currents, and phase voltage.
3-Phase Power Formulas
kVA = V x I x 1.732 / 1000
kW = V x I x 1.732 x PF / 1000
kVAR = sqrt(kVA^2 - kW^2)
Amps = kW x 1000 / (V x 1.732 x PF)
Wye: V_phase = V_line / 1.732, I_phase = I_line
Delta: V_phase = V_line, I_phase = I_line / 1.732
Frequently Asked Questions
What is the 3-phase power formula?
What is a typical power factor for motors?
How do I convert kVA to amps for 3-phase?
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