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.




225+ iOS apps & games curated and reviewed
Every iPhone needs a few good drill size charts apps and games. We benchmark 225+ 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 | 4.6★ (47) | No | No | Aug 2026 | |
| 3 | $1.99 | 4.3★ (30) | No | No | Aug 2026 | |
| 4 | $0.99 | — | No | No | Jul 2026 | |
| 5 | Free | — | No | No | Jul 2026 | |
| 6 | Free | 5.0★ (2) | No | No | May 2026 | |
| 7 | Free | 4.5★ (191) | No | Yes | Jul 2026 | |
| 8 | Free | 4.2★ (6.4K) | Yes | 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.






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.





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 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.


Access a vast database of screw and bolt information, including dimensions, material grades, and strength properties for both US and metric fasteners. Features a comprehensive drill chart, unit conversion, and customizable material displays.


Dig deep into the earth to collect treasures and manage your oil well drilling company. Upgrade your drill, manage fuel, cooling, and speed to reach new depths and discover valuable resources. Earn cash by collecting gold and gems to enhance your drilling capabilities.


Instantly access flange, pipe, and bolt data offline. Quickly find bolt sizes, torque patterns, flange dimensions, and pipe specifications. Ideal for pipefitters and steamfitters needing rapid access to piping information.


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 app allows you to measure lengths accurately in both inches and centimeters. It provides a simple and straightforward tool for quick measurements.


Transform your smartphone into a precise digital measuring tape. Measure objects, size furniture, and scan rooms in 3D using augmented reality. Supports multiple units and allows saving/sharing measurements.


Navigate waterways with detailed marine charts and GPS. Features include route planning, voice-guided navigation, tide and current predictions, and track recording. Offers extensive map coverage for various regions and inland rivers.


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.


Calculate essential drilling parameters like bit TFA, pressure drop, and impact force using bit size, flow rate, and mud weight. Offers a reverse calculation to determine nozzle sizes for a specific total flow area and number of nozzles.


This app provides an interactive analysis of US rotary rig counts, a key indicator for the drilling industry. It helps users understand demand for products used in hydrocarbon extraction and processing.


Easily convert shoe sizes across different regions, genders, and age groups. Get accurate conversions in cm and inches with a clear, readable chart for men, women, and children.


This app provides essential data and calculators for oil and gas well calculations. Access key dimensions, strengths, and specifications for tubulars to quickly determine volumes and capacities. Supports multiple unit systems for flexible calculations.


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.


Access and manage real-time drilling data from your mobile device. View bore data, make edits, and generate reports for immediate sharing and informed decisions.