Convert motor horsepower easily. Precision tool for electrical calculations.
Converting electric motor horsepower to kilowatts is an essential task for electrical engineers, technicians, and facility planners. Horsepower measures mechanical output power, whereas kilowatts define the active electrical power consumed or produced. Because electromechanical conversion involves losses due to heat, friction, and electrical resistance, the calculation requires factoring in motor efficiency and power factor to yield exact electrical parameters.
The standard mechanical conversion formula is straightforward:
Power (kW) = Horsepower (HP) × 0.746
When computing active electrical input requirements accounting for efficiency and power factor in a three-phase system, the calculation utilizes the line current equation:
Current (Amps) = (kW × 1000) / (√3 × Voltage × Power Factor × Efficiency)
Q: Why is 1 HP equal to 0.746 kW?
A: One mechanical horsepower is defined as 550 foot-pounds per second, which equates exactly to 745.7 watts or roughly 0.746 kilowatts.
Q: What happens if nameplate efficiency is missing?
A: If efficiency is unknown, the calculator defaults to a standard industrial average estimate of 90 percent.
Q: How does service factor affect output power?
A: Service factor indicates how much overload a motor can handle safely above its nominal rating under specific conditions.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.