Access comprehensive drill bit size charts with ease. Quickly find conversions between US Number/Letter, Fractional-Inch, and Metric sizes. A handy reference for professionals and students alike.




249+ iOS apps & games curated and reviewed
Every iPhone needs a few good drill size charts apps and games. We benchmark 249+ of them on App Store rating, freshness, and pricing, then surface the standouts so you don't have to scroll the App Store yourself.
| # | App | Price | Rating | Ads | In-App Purchases | Updated |
|---|---|---|---|---|---|---|
| 1 | $0.99 | 4.5★ (22) | No | No | Aug 2026 | |
| 2 | Free | — | No | Yes | Aug 2026 | |
| 3 | $1.99 | 4.3★ (30) | No | No | Aug 2026 | |
| 4 | $0.99 | — | No | No | Jul 2026 | |
| 5 | $0.99 | — | No | No | Aug 2026 | |
| 6 | Free | 5.0★ (2) | No | No | May 2026 | |
| 7 | Free | — | No | Yes | Aug 2026 | |
| 8 | Free | 5.0★ (2) | No | No | May 2026 |




Access comprehensive drill bit size charts with ease. Quickly find conversions between US Number/Letter, Fractional-Inch, and Metric sizes. A handy reference for professionals and students alike.











Calculate the correct drill bit size for your tapping operations. Supports various thread types and inch/metric measurements. Provides precise calculations for depth of thread and clearance.






Easily calculate optimal drill speeds for various drill bits and materials with an intuitive icon-based interface. This app automatically adjusts options based on your selections and remembers your progress.




This application serves machinists, designers, and manufacturing personnel with essential drill bit calculations. It features a comprehensive drill size chart with decimal equivalents, a calculator for optimal speeds and feeds across various materials, and a tool for determining drill point depth based on angle.


This utility app helps you determine the correct drill bit size for threaded holes. It supports both inch and metric threads, calculates close and tight fit hole sizes, and provides tables for standard drill bit sizes and pipe information.








This app serves as a comprehensive reference and calculator for various thread types and dimensions. It provides detailed information on Metric and UN threads, including tap sizes and thread calculations for cutting and forming taps. Users can also find drill size charts and calculate RPM and feed rates for different materials.


This application assists fuel haulers in accurately calculating product quantities when manually measuring tank levels. It simplifies the process of determining amounts for gasoline transport.


Easily create a variety of charts with customizable options. Export or share your creations as images. Supports dark mode and multiple languages for a user-friendly experience.









