HP to Amps Calculator — Free Online Calculator
Convert motor horsepower (HP) to amps. Supports single-phase and three-phase motors with efficiency and power factor inputs.
How to Use This Calculator
Enter the motor horsepower rating, voltage, and phase. Adjust efficiency and power factor if known (typical motor efficiency is 85-95%, power factor 0.80-0.90).
The Formula Explained
First convert HP to watts: Watts = HP × 746. Then account for motor efficiency: Input Watts = Output Watts / Efficiency. Finally convert to amps: Single-phase: I = W / (V × PF). Three-phase: I = W / (V × √3 × PF).