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 | Sep 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 | $0.99 | — | No | No | May 2026 | ||
| 8 | Free | — | No | Yes | Aug 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.