Tech Data

Surface Feet Per Minute (SFPM)

SFPM = (Pi * Diameter * RPM) / 12

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Fill in two values and click "Calculate"

Diameter (inches)

RPM

SFPM

Cutter Chip Load (CL)

CL = Feed Rate (Inches per minute) / RPM / Number of Teeth

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Fill in three values and click "Calculate"

Feed Rate
(Inches per minute)

RPM

Number of Teeth

Cutter Chip Load

Inch/Millimeter Calculator

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Fill in one value and click "Calculate"

Inches
(1" = 25.4mm)

Millimeters
(1mm = 0.03936")

Machining Terms & Formulas

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Terms

IPM = Inches Per Minute

IPR = Inches Per Revolution

RPM = Revolutions Per Minute

SFM = Surface Feet per Minute

D = Drill Diameter

Formulas

IPR x RPM = IPM

IPM / RPM = IPR

SFM x 3.82 / D = RPM

D x RPM x 0.26 = SFM