Three Phase Power Calculator

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Calculate balanced three-phase kW, kVA, kVAR, phase reference values, and estimated output power from line voltage, line current, power factor, and efficiency.

Input Parameters

Line-to-Line Voltage

Three-phase RMS line voltage.

Line Current

RMS line current.

Power Factor

Use 0 to 1.

Efficiency

Optional motor/drive efficiency for output power estimate.

Connection Type

Used to show phase voltage or phase current reference.

Results

Real Power

Apparent Power

Reactive Power

Phase Reference

Estimated Output Power

Design Note

Equations Used

Apparent Power: S = √3 × V_LL × I_L

Real Power: P = √3 × V_LL × I_L × PF

Reactive Power: Q = √(S² - P²)

Wye Phase Voltage: V_phase = V_LL / √3

Delta Phase Current: I_phase = I_line / √3

Frequently Asked Questions (FAQ)

Q1: How do you calculate three-phase power?
For a balanced three-phase load, real power equals √3 × line voltage × line current × power factor.

Q2: Should I use line voltage or phase voltage?
This calculator uses line-to-line voltage, which is the common input for three-phase power calculations.

Q3: What is kVA in a three-phase system?
kVA is apparent power and equals √3 × line voltage × line current divided by 1000.

Q4: Why does power factor affect real power?
Power factor represents how much apparent power becomes useful real power.

Q5: What is the difference between star and delta here?
Total power formula is the same for balanced loads, but phase voltage/current references differ.

Q6: Can this calculator be used for motors?
Yes for electrical input estimates. Mechanical output power also depends on motor efficiency, load, and operating condition.

Disclaimer: This calculator assumes a balanced sinusoidal three-phase load. Real systems may require harmonic analysis, unbalanced load calculation, motor slip/load data, safety margins, and compliance with electrical codes.

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