Convert motor ratings between kilowatts and horsepower, including input power.
Mechanical and metric horsepower differ by about 1.4 per cent, which matters when comparing specifications from different markets. Motor ratings always refer to shaft output. Quoting input power as though it were the rating overstates a motor by its efficiency, which is how undersized machines get specified.
Motor Horsepower
1 hp = 745.7 W mechanical; 1 metric hp (PS) = 735.5 W
1 hp = 745.7 W mechanical; 1 metric hp (PS) = 735.5 W Mechanical and metric horsepower differ by about 1.4 per cent, which matters when comparing specifications from different markets. Motor ratings always refer to shaft output.
Quoting input power as though it were the rating overstates a motor by its efficiency, which is how undersized machines get specified.
This calculator takes 3 inputs: Motor rating, Motor efficiency, Rated speed. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.