Feeds & Speeds Calculators

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Feeds & Speeds

Feeds & Speeds Calculators

Calculate RPM, feed rates, chip loads, and material removal rates for any CNC operation.

RPM Calculator
RPM = (SFM × 3.82) / Diameter
Result
—
RPM
Surface Speed (SFM)
SFM = (RPM × Dia) / 3.82
Result
—
SFM
Feed Rate Calculator
Feed = RPM × Chip Load × Flutes
Result
—
IPM
Chip Load Calculator
CL = Feed / (RPM × Flutes)
Result
—
in/tooth
Metal Removal Rate (MRR)
MRR = WOC × DOC × Feed Rate
Result
—
in³/min
Plunge Rate Calculator
Plunge = Feed × Plunge %
Result
—
IPM
Time to Machine
Time = Length / Feed Rate
Result
—
min
Feed Per Tooth
FPT = Feed / (RPM × Flutes)
Result
—
in/tooth
Table Feed Calculator
Table Feed = RPM × CL × Flutes
Result
—
IPM
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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.