Feeds & Speeds Calculator
Fast shop math when you already know the cutting values. Choose what you want to solve, enter the known values, and get the answer instantly.
Don't have a starting point yet? Try the Feeds & Speeds Advisor for a recommended speed and feed based on your material and setup.
Spindle speed
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Enter both known values to calculate RPM.
Formula RPM = (SFM × 12) / (π × D)