# Drill Size Charts - Drill bit size tables to show US Number / Letter and Fraction Inch sizes in Decimal Inch and Metric Conversions — user reviews > 20 indexed App Store user reviews of Drill Size Charts by Chewy Applications, rated 4.50/5 from 22 ratings. - Source: https://appshunter.io/ios/app/drill-size-charts-drill-bit-size-tables-to-show-us-number-letter-and-fraction-inch-sizes-in-decimal-inch-and-metric-conversions/id418091864/reviews - App overview in markdown: https://appshunter.io/ios/app/drill-size-charts-drill-bit-size-tables-to-show-us-number-letter-and-fraction-inch-sizes-in-decimal-inch-and-metric-conversions/id418091864.md - Rating breakdown: 5★ 17 · 4★ 1 · 3★ 3 · 2★ 0 · 1★ 1 ## Newest reviews (7 of 20) ### 5/5 — Perfect ! *2011-12-18* Drill bits for dummies :) ### 5/5 — Very good *2011-10-05* Exactly what I need. ### 5/5 — Very useful app *2011-06-27* This app is so handy as I was thinking to my self how many mm is 7/16 , so I downloaded this app for only $1.19, and it solved my problem straight away. ### 5/5 — Great quick reference! *2011-04-25* Thorough and exactly what I needed. ### 5/5 — Great app *2011-04-21* Simple and straight forward. Has all the features I needed. ### 5/5 — Simple and to the point! *2011-04-02* I needed a reference to double check my drill sizes and decimal equivalent. Works for me! On the next update I would like see a reference for tap drill sizes! Look forward to it. This has become on of the most used apps on my phone! ### 5/5 — Drill sizes *2011-03-04* Awesome app I needed the the decimal to fractions for metal thickness and such when using a micrometer to get common fractions not ( .160 = 4/25 ) And now I got these other tables to use too. ## Most critical reviews (10 lowest-rated) ### 3/5 — Can’t open *2023-12-21* This is probably one of the best apps when it was working but I haven’t been able to open it with any phone or computer. Please fix this app. ### 4/5 — Chewy and delicious *2014-03-30* Seriously, if you ever drill holes this reference will come in handy. ### 4/5 — Drill chart *2011-09-21* Brilliant . How come I never thought to do this. Duh. ### 5/5 — Drill chart *2017-12-23* Awesome app very quick to reference ### 5/5 — Such a handy tool to have on my iPhone *2015-01-12* Being an aircraft engineer I very often refer to this program to find clearance drills and various conversion sizes of drills to use in my daily job, weather it be on Boeing or Airbus (imperial/metric) components/parts. If I haven't got my trusty "Zeus Book" at hand this app has come to my rescue on more than one occasion. I only wish they did an iPad version rather than having to upscale the iPhone version but as they say "Beggars can't be choosers". I would recommend this app to one and all in the engineering game as it is a most handy tool 👍 ### 5/5 — Does what I want. *2013-11-18* Very convenient. This is exactly what I was looking for to add to my other conversion Apps. English, Metric, Fractional & Decimal. ### 5/5 — Electrician / Fabricator / Repairman *2013-08-11* This will be well worth a buck the first time you have an empty slot in the drawer and you need to get as close as you can to that size. Now I won't have to hold up bits and squint to compare. I work the night shift at a forging shop and we have to fix or build whatever breaks. Now. There's no waiting for tomorrow to get an H bit or whatever from the supplier. Yeah, this'll be handy. Steve ### 5/5 — Does what ir says very well. *2013-03-06* I like the various displays given, and especially liked the "All sizes" list that allows me to easily choose a drill size nearest what I want. One thing that could be added as a nice feature would be a drill size chart for tapping threads. A. very nice app worth the cost. ### 5/5 — Exactly what I was after *2012-10-25* As an electrician in Australia bought up with the metric system, I always had trouble converting to imperial. This app is simple but effective. ### 5/5 — Very handy app *2012-08-12* Simple, easy to use, very handy reference tool. Don't lose this as easily as my old reference card! ## Most praised reviews (3 highest-rated) ### 5/5 — Good app *2012-08-02* I got this thinking that I bet I wasted my money, but after messing with the app I think it's grate. There is not a lot to the app but it gets the job done. ### 5/5 — User *2012-07-18* Great little quick reference tool. Saves time having to track down a printed version. I agree with others that a tap size reference would be awesome as well. ### 5/5 — Drill chart *2012-02-14* As a metal fabricator I have to say this a handy app. Especially when working in the field away from my printed chart. I agree with another reviewer that a drill/tap add on would be great! Worth the buck I spent. --- *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 2026-09-05.*