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Online Calculator
Motor slip calculator
Compare rotor speed with synchronous speed to calculate slip.
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Local processing
The values are processed directly in your browser.
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Frequently asked questions
What's the formula?
s = (Ns - Nr)/Ns × 100 %.
What is Ns?
The synchronous speed.
What is Nr?
The real rotor speed.
Can the slip be negative?
Yes, mathematically, if the speed is above synchronous.