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Drill Calc

By Black Cat Systems

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Need to find the right bit size for a hole? Drill Calc calculates the correct drill bit size to use for threaded holes, based on the bolt (tap) diameter and thread pitch and percentage, for both inch and metric threads. Close and tight fit hole sizes for many popular drill sizes are also displayed.

It also has tables of standard inch fractional and numeric drill bit sizes, as well as complete information for various pipe sizes.

Buy your copy of Drill Calc today, and put away your drill chart.

What's New in Version 2.3

Updates for iOS 7
Fixed bugs that could cause a crash


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Customer Reviews


This app puts at my fingers all the data I could ever need in the machine shop when tapping time comes around. Very detailed and accurate.

Drill Tap

Excellent Reference...

Drill Calc
View In iTunes
This app is designed for both iPhone and iPad
  • $2.99
  • Category: Utilities
  • Updated:
  • Version: 2.3
  • Size: 0.9 MB
  • Language: English
  • Seller:

Compatibility: Requires iOS 4.3 or later. Compatible with iPhone, iPad, and iPod touch.

Customer Ratings

We have not received enough ratings to display an average for the current version of this application.
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