How to use it
- Enter frequency in hertz.
- Enter an even number of poles and optional slip percentage.
- Calculate synchronous and estimated slip-adjusted RPM.
Motor RPM Calculator
Estimate theoretical synchronous RPM and a simple slip-adjusted speed.
Important: This calculator is for educational and estimation purposes only. It is not machinery operation, safety, engineering, or compliance advice. Always consult qualified professionals for real-world automation or manufacturing decisions.
About the Motor RPM Calculator
This calculator applies the standard synchronous-speed relationship for an AC frequency and even pole count.
Formula
Synchronous RPM equals 120 times frequency divided by poles. Estimated motor RPM multiplies that speed by one minus slip.
Example
At 50 Hz with four poles, synchronous speed is 1,500 RPM; 4% slip gives an estimate of 1,440 RPM.
Notes
This simplified relationship is not motor selection, electrical connection or machinery operating guidance.