How does the Critical Speed Calculator work?

Calculate: N_crit = (60 × √(g × δ)) / (π × √(W/g)) Then: Or use stiffness and inertia: ω_n = √(k/I) Then: Operating speed should be 130% of critical.

Can you give an example of how to use the Critical Speed Calculator?

Example: Input Shaft natural frequency 3000 rpm gives a result of Operating range 3900 rpm safe (Avoid 2100-3900 band).

Is the Critical Speed Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Critical Speed Calculator?

Our Critical Speed Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Critical Speed Calculator

Rotor Weight (lbs)

Bearing Stiffness (lbs/in)

Critical speed is the rotational speed at which a rotating shaft reaches natural frequency resonance. Operating above or below critical speed is essential.

Symbol	Name	Unit	Description
W	W value	—	Variable used in the calculation

Difficulty:advanced

References

›Critical Speed — Wikipedia

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Critical Speed Calculator

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Critical Speed Calculator