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Tap Drill Size Calculator

This calculator requires the use of Javascript enabled and capable browsers. This calculator is designed to give the calculated tap drill size from the entered data values of the nominal screw diameter and the screw thread pitch. If you do not know those values, you may look them up in the appropriate tables or drop to the calculators below to figure them. You can send the data back to the original calculator after arriving at a value, or if in the original calculator, pull it from the remote. If all else fails, you may want to use our Drill Size Conversion Table. The information available from our sources is usually sufficient for all computer related drill or screw requirements world wide.

Main Calculator
Calculating Screw Tap Drill Size
Required Data Entry
Enter Screw Nominal Diameter
Look Up: Fraction Screws  Number Screws  Metric Screws  Cap Screws
Enter Screw Pitch
Look Up: Fraction Screws  Number Screws  Metric Screws  Cap Screws
   
Calculated Results
Calculated Tap Drill Size Inches Approximate
The tap drill formula is: tap drill = nominal screw diameter - pitch
Remote Diameter Calculator
Calculating Nominal Diameter Of A Number Screw
Required Data Entry
Enter Screw Number
Look Up: Fraction Screws  Number Screws  Metric Screws  Cap Screws
   
Calculated Results
Calculated Nominal Diameter Inches
Return To Main Calculator
The diameter formula is: diameter = ((screw number) x .0130) + .0600
Remote Pitch Calculator
Calculating Pitch Of A Machine Screw
Required Data Entry
Threads Per Inch
Look Up: Fraction Screws  Number Screws  Metric Screws  Cap Screws
   
Calculated Results
Calculated Thread Pitch Inches
Return To Main Calculator
The screw thread pitch formula is: pitch = 1 / threads per inch
Updated 8.15.11


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