Motor Starter Size Calculator — Free Online Calculator
Size motor starters, contactors, and overload relays based on motor HP, voltage, and full load amps.
How to Use This Calculator
Enter motor HP, voltage, and phase.
The Formula Explained
FLA estimated from HP rating with typical efficiency and power factor. Overload = FLA × 115% per NEC 430.32. NEMA starter size based on HP and voltage ranges.