# 3 Phase AC Motor Starting & Running Current Calculator

getcalc.com's **Starting & Running Current Calculator** is an online electrical engineering tool to calculate starting, running & full-load current of 3 phase AC induction motor.

## Definition & Formulas

Starting & Running current are the three important factors for the rating of AC induction motor. **Starting Current**, sometimes abbreviated as I_{start} in electrical engineering, is a measure or rating of how much current required for a single or three phase AC motor to get started. It's generally, four times of running current. Similarly, **Running Current**, sometimes abbreviated as I_{run} is the current required for an AC induction motor to run freely with no-load after starting up. Similarly, **Full-load Current**, sometimes abbreviated as I_{full-load} is the current required for an AC induction motor to run with its maximum load or rated power. The measurement unit for current is Amperes often used as amps.