Watts to HP Calculator

Convert electrical power (Watts or Kilowatts) to mechanical power (Horsepower). Essential for understanding motor and engine specifications.

Enter Values

Watts
%

Mechanical Power

-- HP
Calculation formula here

Understanding the Conversion

Horsepower (HP) is a unit of power typically used for mechanical output (like engines and motors), while Watts (W) are used for electrical power. Knowing the conversion helps you size generators for motors and vice-versa.

  • Electrical Horsepower: Used for electric motors. 1 HP(E) = 746 Watts.
  • Mechanical Horsepower: Often called Imperial HP. 1 HP(I) ≈ 745.7 Watts.
  • Metric Horsepower: Used in Europe/Asia. 1 PS/CV ≈ 735.5 Watts.

This calculator uses the standard electrical conversion of 1 HP = 746 Watts.

Formulas Used:

HP = (Watts / 746) × (Efficiency / 100)
HP = (kW × 1000 / 746) × (Efficiency / 100)