# Drill Size Charts - Drill bit size tables to show US Number / Letter and Fraction Inch sizes in Decimal Inch and Metric Conversions

> Drill bit size conversion charts for US, fractional, and metric measurements. (iPhone/iPad app by Chewy Applications.)

- 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 (this page in markdown: same URL + `.md`)
- Developer: [Chewy Applications](https://appshunter.io/developer/415417492)
- Category: Reference, Utilities
- Price: $0.99
- Rating: 4.50/5 from 22 App Store ratings · 20 written reviews indexed
- Age rating: 4+
- Requires: iOS 7.0 · 2 MB
- Languages: American English
- Released: 2011-02-09
- Data updated: 2026-09-05
- Monetization: paid
- User reviews 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/reviews.md

## What is Drill Size Charts?

An easy-to-use set of charts for viewing various drill bit size types and their decimal inch and metric size equivalents and conversions. No typing required, just tap the required size type, and scroll through the chart to find your drill size. 

Tables include common drill bit size types: 
• US Number and Letter Gauge Sizes
• Fractional-Inch Sizes
• Metric Sizes
• A table with all types combined, for easy comparison of sizes

A helpful reference tool for anyone dealing with drills of various types: engineers, trades-men, students, tool makers, fitters and turners, fabricators, etc. 

Other Features:

• Search • 
Scroll up within any drill  table to reveal the search bar. 

• All Device Orientations Supported • 
The app can be used in both landscape and portrait orientations, as well as upside-down. 

• Universal App • 
This app is universal; meaning you only need to buy it once to be able to install it on all your iOS devices (iPhone, iPod Touch, and iPad)

If you have suggestions, requests, or need support, feel free to contact us through the app, or by emailing support@chewyapplications.com.

## Key features

- Drill bit size charts
- US Number/Letter gauge sizes
- Fractional-Inch sizes
- Metric sizes
- Combined size table
- Search functionality
- All device orientations supported

## Recent user reviews (10 of 20)

All indexed reviews: 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.md

### 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.

### 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 👍

### 4/5 — Chewy and delicious

*2014-03-30*

Seriously, if you ever drill holes this reference will come in handy.

### 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!

### 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.

## Frequently asked questions about Drill Size Charts

### What drill bit sizes does Drill Size Charts show?

Drill Size Charts displays US Number and Letter Gauge Sizes, Fractional-Inch Sizes, and Metric Sizes. It also includes a combined table for easy comparison across all types.

### How do I find a drill bit size in Drill Size Charts?

You can easily find drill bit sizes by tapping the required size type and scrolling through the chart. A search bar is also available by scrolling up within any drill table.

### What is the price of Drill Size Charts?

Drill Size Charts is available for a one-time purchase of $0.99. This purchase allows installation on all your iOS devices.

### What devices is Drill Size Charts compatible with?

Drill Size Charts is a universal app compatible with iPhone, iPod Touch, and iPad devices. It supports all device orientations, including landscape and portrait.

### How often is Drill Size Charts updated?

The latest version, 2.0, was released on September 24, 2015. While not frequently updated recently, the app provides stable reference functionality.

### What is the age rating for Drill Size Charts?

Drill Size Charts has an age rating of 4+, making it suitable for a wide range of users, including younger students learning about tools and measurements.

### Does Drill Size Charts have ads?

No, Drill Size Charts does not contain advertisements. It is a paid application designed to be ad-free for a better user experience.

### Can I get support for Drill Size Charts?

Yes, you can contact the developer, Chewy Applications, for suggestions, requests, or support through the app or by emailing support@chewyapplications.com.

## Version history (last 3 releases)

### 2.0 — 2015-09-24

This update from Apple will improve the functionality of this app. No new features are included.

• Updated for iOS 9 - our apologies for those users who couldn't use the app on iOS 9 until now.
• Added Fractional Inch sizes up to 7 inches.
• Added Metric sizes up to 180mm.
• Added a table to show Fractional Inch sizes reduced down to X/64 and X/32.
• UI updated for iPhone 5, iPhone 6, and iPhone 6 Plus.
• Search function: since the tables are longer now, we added a search bar at the top of all tables (scroll up to access it).
• Universal app - download it on your iPhone & iPad
• New home screen layout and info section in Settings.

### 1.1 — 2011-03-15

Version 1.1 includes:
- Increased performance (lower memory usage)
- New home screen layout and info section
- New artwork

### 1.0 — 2011-02-08

No release notes.

## Apps similar to Drill Size Charts

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Base - Base Converter](https://appshunter.io/ios/app/base-base-converter/id1403216682) | — | $0.99 | Reference |
| [Steel Profiles](https://appshunter.io/ios/app/steel-profiles/id564614324) | 4.7 (269) | Free | Reference |
| [Metric Conversion tool](https://appshunter.io/ios/app/metric-conversion-tool/id1439430070) | 4.8 (14,634) | Free | Reference |
| [Aerospace Groove Selector](https://appshunter.io/ios/app/aerospace-groove-selector/id524363133) | 5.0 (2) | Free | Reference |

## More apps by Chewy Applications

- [Drill and Tap Tool - Thread Tapping & Through Hole](https://appshunter.io/ios/app/drill-and-tap-tool-thread-tapping-and-through-hole/id421763062)
- [SpeedGlow Speedometer - Gesture Controlled Speedo](https://appshunter.io/ios/app/speedglow-speedometer-gesture-controlled-speedo/id523586069)
- [GST NZ Calculator](https://appshunter.io/ios/app/gst-nz-calculator/id587311220)
- [Australia GST - Tax Calculator](https://appshunter.io/ios/app/australia-gst-tax-calculator/id592595980)
- [Cooking Converter - Weights, Volumes, Temperatures](https://appshunter.io/ios/app/cooking-converter-weights-volumes-temperatures/id675494449)

All apps by Chewy Applications: https://appshunter.io/developer/415417492

## Related topics

[drill size charts](https://appshunter.io/ios/topics/drill-size-charts) · [drill bit converter](https://appshunter.io/ios/topics/drill-bit-converter) · [drill chart](https://appshunter.io/ios/topics/drill-chart) · [size chart](https://appshunter.io/ios/topics/size-chart) · [size chart pro](https://appshunter.io/ios/topics/size-chart-pro)

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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 2026-09-05.*