Induction motor slip calculator

The speed of an induction motor is always lesser than its synchronous speed. The difference between the actual speed and the synchronous speed of a motor is known as slip. Here is a simple induction motor slip calculator. If you want to calculate the synchronous speed, you can use the synchronous speed calculator tool.

Measured Speed
Synchronous speed
Motor Slip

How to use the induction motor slip calculator:

The above tool requires following data for calculation:

  1. The synchronous speed of the motor. (you can use synchronous speed calculator tool.)
  2. The actual speed of the motor. (Mandatory)

After entering the required data from the nameplate, click on the “Calculate” button to find out the slip.

number of poles calculator

The rated speed of the motor is mentioned in RPM. In order to find out the synchronous speed roundup the values mentioned on the nameplate to the nearest value in the table below:

Speed at 50HzSpeed at 60Hz

Slip calculation and formula

The following formula can be used for the calculation:

    \[    Motor \mspace{4} slip  =\frac{ n_s - n}{n_s} \times 100% \]


  • n: Supply frequency
  • ns: Synchronous speed
Motor slip calculator

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