Stall Torque Calculator


About Stall Torque Calculator (Formula)

A Stall Torque Calculator is a valuable tool in engineering and physics, particularly in the field of mechanics and motor design. It is used to determine the stall torque of an electric motor, which is the maximum torque an electric motor can produce when the rotor (the rotating part of the motor) is prevented from turning or “stalled.” Understanding stall torque is crucial in motor selection, design, and various engineering applications.

The formula for calculating stall torque in an electric motor is relatively straightforward:

Stall Torque (Ts) = Stall Current (Is) × Torque Constant (Kt)


  • Stall Torque (Ts) is the maximum torque produced by the electric motor when it is stalled, typically measured in Newton-meters (Nm) or pound-feet (lb-ft).
  • Stall Current (Is) is the current drawn by the motor when it is stalled, usually measured in amperes (A).
  • Torque Constant (Kt) is a motor-specific constant that relates the current to the torque produced by the motor. It is typically measured in Nm/A or lb-ft/A.

The formula essentially states that the stall torque of a motor is directly proportional to the stall current and the torque constant. In other words, the more current the motor draws when stalled and the higher the torque constant, the greater the stall torque will be.

To use the Stall Torque Calculator effectively, you need to have information about the motor’s stall current and torque constant. These values are typically provided by the motor manufacturer or can be determined through testing and measurement. Inputting these values into the formula will yield the stall torque of the motor.

Stall torque calculations are essential in a wide range of engineering applications, including robotics, automotive engineering, and industrial machinery. Engineers use stall torque values to ensure that motors can provide the necessary torque to perform specific tasks, such as lifting heavy loads or driving mechanical components.

In summary, a Stall Torque Calculator is a valuable tool for engineers and designers working with electric motors. It allows them to determine the maximum torque a motor can produce when stalled, ensuring that motors are appropriately sized and matched to specific applications and tasks.