Industrial Calculators Surface Feet per Minute (SFM) Tool Diameter (Inches)Revolutions Per Minute (RPM)Resulting surface feet per minute: Inches Per Minute (IPM) Revolutions per minute:Feed:Resulting inches per minute: Revolutions Per Minute (RPM) Tool Diameter:Surface Feet Per Minute:Resulting Revolutions Per Minute: Calculate Metric to Inches Metric to Inches:Results: These calculations are based upon theoretical values and are only intended for planning purposes. Actual results will vary. No responsibility from Haskins Industrial.