Best Drill Size Charts Apps & Games

225+ iOS apps & games curated and reviewed

4.4 avg rating
15 free apps & games
Updated May 2026

Every iPhone needs a few good drill size charts apps. 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.

Top Picks for Drill Size Charts

Drill Size Charts - Drill bit size tables to show US Number / Letter and Fraction Inch sizes in Decimal Inch and Metric Conversions screenshot 1
Drill Size Charts - Drill bit size tables to show US Number / Letter and Fraction Inch sizes in Decimal Inch and Metric Conversions screenshot 2
Drill Size Charts - Drill bit size tables to show US Number / Letter and Fraction Inch sizes in Decimal Inch and Metric Conversions screenshot 3
Drill Size Charts - Drill bit size tables to show US Number / Letter and Fraction Inch sizes in Decimal Inch and Metric Conversions screenshot 4

This application provides easy access to drill bit size charts, allowing users to quickly find decimal inch and metric size equivalents for various drill bit types, including US Number and Letter Gauge Sizes, Fractional-Inch Sizes, and Metric Sizes. A helpful reference tool for professionals and students, it features search functionality, support for all device orientations, and is available for use across multiple iOS devices.

FSWizard#2

FSWizard by Eldar Gerfanov

CNC Machinist Calculator
Strong Contender
📊 Productivity
4.6(47 ratings)
Free
FSWizard screenshot 1
FSWizard screenshot 2
FSWizard screenshot 3
FSWizard screenshot 4
FSWizard screenshot 5
FSWizard screenshot 6

This CNC machinist calculator simplifies the process of determining optimal cutting conditions for milling, drilling, and turning operations by automatically suggesting speeds, feeds, and cutting depths based on the selected work and tool materials. By using this calculator, machinists can improve productivity, optimize cutter life, and access various reference charts and tools, such as drill and tap charts, triangle and fillet calculators, and more.

More Drill Size Charts apps to explore

4
FSWizard PRO
FSWizard PRO
FSWizard PRO
by Eldar Gerfanov
$17.99

This application is a CNC machinist speed and feed calculator that simplifies the calculation of cutting conditions for milling, drilling, and turning operations by automatically using recommended cutting speeds and chip loads based on work and tool material selection. It helps improve productivity, optimize cutter life, and supports various machining operations, including chip thinning and HSM machining.

📊 Productivity
(23)
5
iEngineer
iEngineer
iEngineer
by Perfectly Simple Apps LLC
Free

Access the most comprehensive screw and bolt database with iEngineer. Find detailed information on 93 different US screws and more. Get all the screw details you need at your fingertips!

🔍 Reference
(191)
6
Tap & Drill Size Reference
Tap & Drill Size Reference
Tap & Drill Size Reference
UNC UNF Metric Thread Chart
$0.99
🔧 Utilities
(0)
7
WS Drill Bits
WS Drill Bits
WS Drill Bits
by Rein Rapp
Free

Simplify your machining tasks with a comprehensive drill bit calculator. Quickly access a detailed size chart, determine optimal speeds and feeds for various materials, and calculate precise drill point depths for any angle.

📚 Education
(2)
8
Oil Well Drilling
Oil Well Drilling
Oil Well Drilling
How deep can you take drill?
Free

Embark on an exciting oil well drilling adventure where you dig deep to collect treasures like gold and gems. Manage fuel, cooling, and speed to upgrade your drill and reach new depths, all while discovering fun features like maps and idle drilling. Start your digging journey now and see how deep you can go!

🎮 Games
(6.4K)
9
Drill Speed
Drill Speed
Drill Speed
Drill Speed Calculator
Free

This application helps you find the optimal drill speeds for your drill bits and materials with a simple and intuitive interface. It allows you to quickly select your drill bits and materials, and provides details and remembers your selections for easy reference, even on an Apple Watch.

🔍 Reference
(2)
10
Flange Bolt Size & Torque
Flange Bolt Size & Torque
Flange Bolt Size & Torque
Size & Torque Patterns
Free

This application helps users identify the appropriate flange bolt size for their specific needs. Simply input your flange specifications, and the app will provide you with the correct bolt size recommendations. Find the perfect bolt size quickly and efficiently.

🔍 Reference
(348)
11
Ruler ++
Ruler ++
Ruler ++
Measure lengths
Free

Easily measure lengths in both inches and centimeters with this convenient application. Simply download now to streamline your measuring needs.

📊 Productivity
(884)
12
i-Boating: Marine Charts & Gps
i-Boating: Marine Charts & Gps
i-Boating: Marine Charts & Gps
Lake Maps & Fishing Spots
Free

Discover a comprehensive marine navigation app with detailed charts, precise route planning, and real-time AIS tracking. Navigate ocean waters effortlessly and ensure safe voyages with this essential tool for all boating enthusiasts. Explore and download the app to set sail confidently today!

🗺️ Navigation
(14K)
13
DigiTrak LWD
DigiTrak LWD
DigiTrak LWD
Real-time access to bore data
Free

This application allows users to transfer and view drill data on their mobile device in real-time, enabling easy editing, annotation, and sharing of data with others. It streamlines the documentation process, providing professional reports and customizable PDFs, and offers features such as geotagging and data visualization to enhance drilling operations and decision-making.

📊 Productivity
(8)
14
ThreadKing
ThreadKing
ThreadKing
Ultimate Reference for Threads
Free

This application is a comprehensive reference and calculator for threads, providing detailed information on thread dimensions, drill and tap sizes, and calculations for drill sizes, RPM, and feed rates. It helps users find the right thread information and make calculations based on thread percentage, making it a handy tool for professionals and individuals working with threads.

📊 Productivity
(12)
15
Ring Sizer・Tape Measure・Metrix
Ring Sizer・Tape Measure・Metrix
Ring Sizer・Tape Measure・Metrix
Digital Measuring & AR Ruler
Free

The application allows users to transform their smartphones into a digital measuring tape, offering real-time measurements, imperial and metric unit support, and the ability to save and share measurements. It also features augmented reality (AR) technology to scan rooms and automatically calculate dimensions. Users can try the app and subscribe to a premium version to access its full set of features.

🔧 Utilities
(22)
16
Drill Calc
Drill Calc
Drill Calc
by Black Cat Systems
$2.99

This application calculates the correct drill bit size for threaded holes based on bolt diameter, thread pitch, and percentage, supporting both inch and metric threads. It also provides tables of standard drill bit sizes, pipe sizes, and wood screw information, making it a handy tool for finding the right drill bit size.

🔧 Utilities
(13)
17
Drill Bit Nozzle Calculator
Drill Bit Nozzle Calculator
Drill Bit Nozzle Calculator
by NOV Inc.
Free
💼 Business
(2)
18
Rig Count
Rig Count
Rig Count
by Baker Hughes Company
Free

This interactive analysis provides insights into the US drilling industry through an examination of rotary rig counts, serving as a key indicator of demand for industry products. Explore the data to stay informed about trends and shifts in the market.

💼 Business
(23)
19
AR Ruler: Digital Tape Measure
AR Ruler: Digital Tape Measure
AR Ruler: Digital Tape Measure
Lidar Scanner: Distance・Length
Free

An innovative AR measurement app utilizing AR technology for room measurements, object sizing, distance estimation, and more. Simply point your camera, aim at a surface, and begin measuring in various units with precision. Start measuring now!

📊 Productivity
(938)
20
Shoe Size Converter & Chart
Shoe Size Converter & Chart
Shoe Size Converter & Chart
by Arsosa Network Inc.
Free

This application allows users to easily convert shoe sizes between different regions, genders, and lengths, and provides a comprehensive chart for men, women, and children. Simply select your category, enter your current size or measurement, and get instant conversions for various regions and sizes in cm and inches.

🔧 Utilities
(27)