Power Factor Tool

Watts to Amps with Power Factor Calculator

Accurately convert watts to amps for AC circuits where you know the power factor. Power factor (PF) accounts for the phase difference between voltage and current in reactive loads like motors and transformers.

Conversion direction

Electrical system

PowerWVoltageV

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 power factor?

Power factor is the ratio of real power (watts) to apparent power (volt-amps). It ranges from 0 to 1. A PF of 1.0 means all current does useful work. Lower PF means higher current for the same watts.

What PF should I use for a motor?

Most AC induction motors have a full-load PF of 0.80 to 0.92. Check the motor nameplate for the exact value. Use 0.85 if no data is available.