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Motor speed calculator

Calculates the synchronous speed of an AC induction motor from the supply frequency and the number of poles.

See Also


  • Motor frequency (f): Motor power supply frequence, for example 50 Hz.
  • Number of poles (p): For example, 4.

How to calculate motor speed?

The synchronous motor speed is calculated with the following equation:

\(N_{s}=\displaystyle \frac{120 \cdot f }{p}\)


  • Ns is the motor speed in RPM.
  • f is the frequency in Hz.
  • p is the number of poles.