Home Back

kW Calculator for 3 Phase Power

3-Phase Power Formula:

\[ kW = \frac{\sqrt{3} \times Volts \times Amps \times PF}{1000} \]

V
A

Unit Converter ▲

Unit Converter ▼

From: To:

1. What is a 3-Phase Power Calculator?

Definition: This calculator computes the real power (in kilowatts) for a three-phase electrical system based on voltage, current, and power factor.

Purpose: It helps electricians, engineers, and technicians determine the actual power consumption or generation in three-phase AC systems.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ kW = \frac{\sqrt{3} \times Volts \times Amps \times PF}{1000} \]

Where:

Explanation: The √3 factor accounts for the phase difference in three-phase systems, converting line-to-line voltage to phase voltage.

3. Importance of 3-Phase Power Calculation

Details: Accurate power calculation is essential for proper equipment sizing, energy efficiency analysis, and electrical system design.

4. Using the Calculator

Tips: Enter the line-to-line voltage in volts, current in amps, and power factor (default 0.8). All values must be > 0, with power factor between 0 and 1.

5. Frequently Asked Questions (FAQ)

Q1: What is power factor?
A: Power factor is the ratio of real power to apparent power, representing how effectively current is being converted into useful work.

Q2: What's a typical power factor value?
A: For motors, 0.8-0.9 is common. Resistive loads have PF=1, while inductive loads have lower PF.

Q3: Is this formula for line or phase values?
A: This uses line-to-line voltage and line current (common measurements in three-phase systems).

Q4: How does this differ from single-phase calculation?
A: Single-phase uses P=VI×PF, without the √3 factor needed for three-phase systems.

Q5: What if I know kW and want to find current?
A: Rearrange the formula: \( Amps = \frac{kW \times 1000}{\sqrt{3} \times Volts \times PF} \)

kW Calculator for 3 Phase Power© - All Rights Reserved 2025