Calculate 3-phase real power, apparent power, current, and power factor for balanced loads.
Choose what to calculate. "Find Power" computes power from voltage and current. "Find Current" computes current from power and voltage.
Voltage measured between any two phases. Common: 208V, 240V, 480V, 600V. Line-to-neutral = Line-to-line / sqrt(3).
V
Current flowing through each phase conductor. For balanced loads all three phases carry equal current. Measure with a clamp meter.
A
Actual real power consumed by the load in kilowatts. Found on equipment nameplates or from power meter readings.
kW
Ratio of real to apparent power (0 to 1.0). Resistive loads: 1.0. Motors: 0.80-0.90. 0.85 is a common default for mixed industrial loads.
PF
Results
Real Power (P)-kW
Apparent Power (S)-kVA
Reactive Power (Q)-kVAR
Line Current-A
Line-to-Neutral Voltage-V
References:
P = sqrt(3) x V_LL x I_L x PF. S = sqrt(3) x V_LL x I_L. Q = sqrt(S² - P²). V_LN = V_LL / sqrt(3). Assumes balanced 3-phase load. Per IEEE Std 141 (Red Book) and NEC Article 220.