Motor Horsepower (HP) Calculator
Accurate motor horsepower calculations for AC/DC systems
Motor HP Calculator
Compliant with NEMA MG 1 Standards
Results:
Horsepower (HP): 0.00
How to Use the Calculator
AC Single Phase
- Select "AC" system type
- Choose "Single Phase"
- Enter line-to-neutral voltage
- Provide current in amps
- Input power factor (0-1)
- Enter motor efficiency (0-100%)
AC Three Phase
- Select "AC" system type
- Choose "Three Phase"
- Enter line-to-line voltage
- Provide current in amps
- Input power factor (0-1)
- Enter motor efficiency (0-100%)
DC Systems
- Select "DC" system type
- Enter voltage
- Provide current in amps
- Enter motor efficiency (0-100%)
Motor Power Fundamentals
AC Motor Power
In AC motor systems, power calculations consider:
- Phase configuration (Single/Three)
- Power factor (cosφ)
- Motor Efficiency (η)
DC Motor Power
- No phase or power factor considerations
- Simple V × I calculation for input power
- Motor Efficiency (η) is crucial for output HP
Key Formulas:
Input Watts (AC Single Phase): W = V × I × PF
Input Watts (AC Three Phase): W = √3 × V × I × PF
Input Watts (DC): W = V × I
Horsepower (HP): HP = (W × Eff) / 746
Calculation Formulas
AC Single Phase (Input Watts):
W = V × I × PF
AC Three Phase (Input Watts):
W = √3 × V × I × PF
DC Systems (Input Watts):
W = V × I
Horsepower (HP):
HP = (W × Eff) / 746
Example Calculation
Three Phase AC Motor:
Voltage: 480V
Amps: 50A
PF: 0.8
Efficiency: 90% (0.9)
Input W = √3 × 480V × 50A × 0.8 = 33255.39 W
Output HP = (33255.39 W × 0.9) / 746 = 40.09 HP
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