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
View Calculator
Fill in three values and click "Calculate"
Feed Rate
(Inches per minute)
(Inches per minute)
RPM
Number of Teeth
Cutter Chip Load
Inch/Millimeter Calculator
View Calculator
Fill in one value and click "Calculate"
Inches
(1" = 25.4mm)
(1" = 25.4mm)
Millimeters
(1mm = 0.03936")
(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