# Drill Calc — user reviews

> 12 indexed App Store user reviews of Drill Calc by Black Cat Systems, rated 4.10/5 from 19 ratings.

- Source: https://appshunter.io/ios/app/drill-calc/id304434324/reviews
- App overview in markdown: https://appshunter.io/ios/app/drill-calc/id304434324.md
- Rating breakdown: 5★ 12 · 4★ 3 · 3★ 1 · 2★ 0 · 1★ 3

## Most critical reviews (10 lowest-rated)

### 1/5 — App fail to load

*2024-02-02*

I was unable to access the app after downloading it.  Restarting my phone did not repair it.  Money wasted.

### 4/5 — Good, but could be better

*2026-05-02*

I am a hobbyist machinist.  I am always using Drill Calc for looking up drill sizes when I am threading.  One feature I would appreciate is an all encompassing  decimal lookup chart.  This single chart would contain fractional, lettered, numbered and metric drill sizes. 
I also would find it helpful if you supplied the data for doing external threading.

### 4/5 — Value for money

*2019-02-13*

Great for 99% of threads metric or imperial. Metric could have a few more of the common pitches listed. A seperate group for BSP threads of both US and UK types would be great.

### 4/5 — Good, but could be better

*2012-11-10*

I am a hobbyist machinist.  I am always using Drill Calc for looking up drill sizes when I am threading.  One feature I would appreciate is an all encompassing  decimal lookup chart.  This single chart would contain fractional, lettered, numbered and metric drill sizes. 
I also would find it helpful if you supplied the data for doing external threading.

### 4/5 — Works well

*2009-12-01*

Functionality of app is great!  Good clean layout. I agree that pipe theads would be a great addition, as well as fine threads for metric taps. Clearance drills, counterbores, and reamer drill sizes would also be a welcomed upgrade. I would pay extra for those options even.   Keep up the good work

### 4/5 — Works fine

*2009-05-30*

It is a plain ol' drill chart, and it works just fine.  Thanks!  Would like to have pipe threads too, though.

### 4/5 — Good, needs though-hole measurements

*2009-04-24*

As far as I can tell does not have though-hole measurements, which would be easy to add to each bolt size and very useful

### 5/5 — Handy tool

*2026-06-16*

First place I look when I have a question about drill or tap size

### 5/5 — Awesome

*2015-09-02*

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.

### 5/5 — Drill Tap

*2014-04-15*

Excellent Reference...

## Most praised reviews (2 highest-rated)

### 5/5 — V 2.0 works great & w/Pipe Thd data

*2010-09-15*

This is great; all the Inch - Metric and Pipe Information in one app.

We deal with both english and metric taps at the machine shop I work for, so this makes it a very handy app.

### 5/5 — Can't live without it

*2009-03-29*

Great tool for any tool and die maker.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-12.*