Face Mill Speed and Feed Calculator

MILLING

Get RPM and table feed for a face mill from cutter diameter, target SFM, insert count, and feed per insert.

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Spindle Speed (RPM)
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Table Feed (IPM)

RPM = (SFM x 3.82) / D. Feed = RPM x Feed per Insert x Number of Inserts.

How it works

Face milling uses the same speed and feed math as end milling, just with insert count standing in for flute count. Cutter diameter for SFM purposes is the actual cutting diameter, not the body diameter.

FAQ

Do all inserts need to engage every revolution? No, but the feed-per-insert number assumes full engagement; reduce it if only some inserts are cutting on a given pass.

Related Guides

CNC Calculators · End Mill Speed and Feed Calculator · SFM Calculator

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The calculators and tools on Formula Factory are provided for general guidance and informational purposes only. Results are estimates based on standard formulas and the values you enter — they do not constitute professional engineering, electrical, or architectural advice. Always verify calculations with a qualified professional before making decisions for any safety-critical, code-compliance, or commercial application. Formula Factory makes no representations or warranties as to the accuracy or completeness of any result, and accepts no liability for errors, omissions, or any outcomes arising from reliance on this information.