Motor Starting Current Calculator

Calculate motor inrush current, starting kVA, and voltage drop impact for DOL, star-delta, and VFD starting.

Motor rated horsepower.
HP
Supply voltage.
V
Motor efficiency at full load.
%
PF during starting. Typical: 0.15-0.25.
Multiplier: Code A=0-3.15, F=5-5.6, G=5.6-6.3, H=6.3-7.1 kVA/HP.
kVA/HP

Results

Full Load Current-A
DOL Starting Current-A
Start/Run Current Ratio-x
Starting kVA Demand-kVA
Star-Delta Start Current-A
References: NEC Article 430; NEMA MG-1; IEEE 141