Speed & Feed Calculators and Common Formulas

Speed & Feed CalculatorsSpeed & Feed Calculators

Input the required information into these Excel spreadsheet files, and the calculator will automatically provide the necessary speed and feed for your application.


DAPRA Speed/Feed Calculators
Tool Line File Size Revised
High Feed Shell and End Mills 25k November 2011
Ball Nose Finishers 45k June 2009
90° Square Shoulder Mills & Inserts 44k May 2003
Toroid Cutters 48k Dec. 2007

Common Formulas for Milling Operations

Download these formulas as a printable PDF file (100k).

Variables (Abbreviation)
Speed – Surface Feet per Minute (SFM)
Feed – Inches per Minute (IPM)
Feed per Tooth (FPT)
Adjusted Feed per Tooth – Chip Thinning (AFPT)
Feed per Revolution (FPR)
Depth of Cut (DOC)
Width of Cut (WOC)
Tool Diameter (D)
# of Teeth in Cutter (Z)
Metal Removal Rate – Cubic Inches per Minute (MRR)

For lead angle (chip thinning) and effective cutting diameter compensation, see corresponding tool reference page / catalog.