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Electrical

Induction Motor Slip Calculator

Calculate synchronous speed and slip from frequency, pole count and rotor speed.

Ideal component relationshipsUnits and assumptions explained below
Circuit workbench
Circuit workbench

Keep RMS, peak and DC values distinct.

See the method

Enter circuit values

Runs on your device

Your circuit result

Your result

Let’s calculate.

Use the Calculate button to see your result.

Review the method below for assumptions and conventions.

How to use this tool

  1. Enter supply frequency, number of poles, rotor speed.
  2. Select Calculate to view the result.
  3. Check the method and assumptions below before using the result.

The method, explained

Synchronous rpm = 120f/poles; slip = (synchronous−rotor)/synchronous × 100%.

A WORKED EXAMPLE

Using supply frequency = 50 Hz, number of poles = 4, rotor speed = 1440 rpm, the result is 4 %. Change these example inputs to match your task; use the method above to check each step.

Understanding your result

Negative slip indicates super-synchronous operation. This estimates speed relationship, not torque or motor efficiency.

What to keep in mind

Negative slip indicates super-synchronous operation. This estimates speed relationship, not torque or motor efficiency. Ideal-component calculation for study and estimation. It does not select safe wiring, protective devices or component ratings for an installation.

Common questions

How do I use this induction motor slip calculator?

Calculate synchronous speed and slip from frequency, pole count and rotor speed. Enter supply frequency in Hz, number of poles, rotor speed in rpm. The starting example is editable; use values for the same system or project.

Which assumptions affect this result?

Negative slip indicates super-synchronous operation. This estimates speed relationship, not torque or motor efficiency.

Methodology maintained by ClarityKit. How these tools are built and checked.