Watt and Ampere Calculator
3-Phase AC Tool

3 Phase Watts to Amps Calculator

Calculate line current for balanced three-phase AC systems. The formula uses the square root of 3 (approx 1.732). Used for industrial motors, commercial panels, generators, and three-phase transformers.

Conversion direction
Electrical system
Quick voltage presets
Calculated result1000 W · 120 V · DC
8.333 A
Formula usedI = P / V

Custom voltage is always supported.

Formulas Used

DCI = P / V

No power factor needed for DC circuits.

AC 1φI = P / (V × PF)

Single-phase AC — multiply voltage by power factor.

AC 3φI = P / (√3 × V × PF)

Three-phase AC — divide by √3 ≈ 1.732.

Frequently Asked Questions

What is the three-phase watts to amps formula?

I = P / (sqrt(3) x V x PF) = P / (1.732 x V x PF). For 10,000W at 400V with PF 0.9: I = 10000 / (1.732 x 400 x 0.9) = 16.04 A.

Is the voltage in the formula line-to-line or phase voltage?

The formula uses line-to-line voltage (also called line voltage). This is the voltage measured between any two of the three phase conductors.