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1) Click Reset 
2) Enter all but one value 
3) Click Compute

Calculate Surface Feet Per Minute  
SFM = (Pi * Dia * RPM) / 12 
SFM = Surface Feet Per Minute 
Dia = Diameter (inches) 
RPM = Revs Per Minute

Dia  RPM  SFM 


Convert Between Inches & Millimeters 
.03936" = 1mm     25.4mm = 1"

Inches  Millimeters


Convert From Fraction to Decimal 
(Does not go from decimal to fraction)

Fraction  Decimal 

Calculator Java scripts courtesy of The Machinists' Exchange On-line.
© The Machinists' Exchange On-line. Used with permission.