RPM Calculator

To find the Revolutions Per Minute (RPM), please enter the Diameter of Cutter or Workpiece (if turning), and the Surface Feet per Minute (SFM)

Required Formulas

RPM = SFM x 12 / PI x D
or
RPM = 3.82 x SFM / D
PI=3.14

RPM= Diameter= SFM=

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