Motor systems
Motor Starting Current Calculator
Estimate motor starting current from full-load current and an entered locked-rotor multiplier.
Systems worksheet
Calculation inputs
A
Calculated result
120 A
Planning estimateConfirm equipment ratings, manufacturer limits, adopted code requirements, and system-specific calculations before installation.
Method and field check
Starting current is full-load current multiplied by the entered factor. Use manufacturer locked-rotor data when available and check voltage drop during starting.