Motor Rating Torque Calculator

Free calculator estimate AC motor rating torque in Imperial and SI unit.

Motor Rating

Speed

RPM

Frequency

Motor Rating Torque		–
Motor Poles		–

Motor Torque

The rating torque of a motor is the torque necessary to produce its rated power (in HP or kW) at rating speed.
In pounds at a foot radius, it is equal to the horsepower times 5252 divided by the rating speed.

$\mathbf{T } = \frac{\mathbf{HP} \ast 5252 }{\textit{n}}$

In SI unit:

$\mathbf{T } = \frac{\mathbf{P} \ast 9549 }{\textit{n}}$

where:

T : Motor torque in lbft or Nm
P : Motor real power in HP or kW
n : Motor speed in RPM