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
Finding the right drill chart apps and games can be overwhelming with so many options. We've analyzed 249+ apps and games to bring you the best choices for 2026, from free options to premium solutions with advanced features.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 | $0.99 | 4.5★ (22) | No | No | Aug 2026 | ||
| 2 | $1.99 | 4.3★ (30) | No | No | Aug 2026 | ||
| 3 | Free | 4.6★ (47) | No | No | Aug 2026 | ||
| 4 | Free | 4.6★ (196) | No | Yes | Sep 2026 | ||
| 5 | Free | 5.0★ (2) | No | No | May 2026 | ||
| 6 | Free | 5.0★ (2) | No | No | May 2026 | ||
| 7 | Free | 4.7★ (3) | No | Yes | Oct 2026 | ||
| 8 | $0.99 | — | No | No | Jul 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.






This app is a comprehensive calculator for CNC machinists, simplifying the calculation of speeds and feeds for milling, drilling, and turning operations. It automatically suggests optimal cutting conditions based on material choices and supports advanced features like chip thinning and HSM machining.