Best Drill Bit Converter Apps

250+ iOS apps curated and reviewed

3.6 avg rating

17 free apps

Updated September 2026

Looking for free drill bit converter apps? 17 of our 250+ tracked titles are free to download — no subscription, no trial. The rest are premium picks worth paying for.

Compare top Drill Bit Converter Apps (September 2026)

#	App	Price	Rating	Ads	In-App Purchases	Updated
1	WS Drill Bits	Free	5.0★ (2)	No	No	May 2026
2	Drill Bit Converter	$0.99	—	No	No	Jul 2026
3	Drill Bit Matcher	Free	—	No	Yes	Jun 2026
4	Drill Calc	$2.99	4.1★ (19)	No	No	Aug 2026
5	Converter	Free	1.0★ (3)	No	No	May 2026
6	Drill Size Charts - Drill bit size tables to show US Number / Letter and Fraction Inch sizes in Decimal Inch and Metric Conversions	$0.99	4.5★ (22)	No	No	Aug 2026
7	Unit Converter	Free	2.0★ (7)	Yes	No	May 2026
8	Atom Bit Guide	Free	5.0★ (1)	No	No	May 2026

Top Picks for Drill Bit Converter

#1

WS Drill Bits by Rein Rapp

Editor's Choice

5.0(2 ratings)

Free

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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.

#2

Drill Bit Converter by Dohmann Engineering Services

Strong Contender

0.0(0 ratings)

$0.99

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#3

Drill Bit Matcher by Deisy Renteria

Find Bit & Pilot Hole Size

Worth Considering

0.0(0 ratings)

FreeIn-App Purchases

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More Drill Bit Converter apps to explore

by Black Cat Systems

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.

Calculates drill bit size for threaded holesSupports inch and metric threadsDisplays close and tight fit hole sizes

by ThinkSys Inc

This utility app provides quick and easy conversions between various measurement units. It supports standard categories like length, area, volume, and weight, as well as specialized units for angle, speed, data storage, and currency for over 160 countries.

Supports standard measurement unitsConverts angle, speed, and data storageCurrency conversion for 160+ countries

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

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

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

by Chewy Applications

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.

Drill bit size chartsUS Number/Letter gauge sizesFractional-Inch sizes

by Yunus Kilinc

This application offers a professional and user-friendly interface for converting between various units. It supports over 300 units across more than 20 categories, including currency, temperature, and length.

Impressive designConvenient interfaceEasy to use

Atom Bit Selection Guide

This mobile application assists drilling professionals in selecting the correct diamond core bit configurations. It offers guidance, product details, and cross-reference tools to match bits with specific ground conditions and site requirements.

Diamond core bit selection guidanceProduct informationCross-reference tools

📊 Productivity

SumiTool Converter

SumiTool Converter

SumiTool Converter

by SUMITOMO ELECTRIC INDUSTRIES,LTD.

Drill Speed Calculator

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.

Intuitive icon-based interfaceWide selection of drill bits and materialsAutomatic option adjustment

All-in-One Units

All-in-One Units

All-in-One Units

All-in-One Unit Converter

All-in-One Unit Converter

All-in-One Unit Converter

15+ categories & 20+ languages

UnitAi: Storage Unit Converter

UnitAi: Storage Unit Converter

UnitAi: Storage Unit Converter

Data Units Made Easy

Drill Bit Nozzle Calculator

Drill Bit Nozzle Calculator

Drill Bit Nozzle Calculator

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.

Calculate bit TFACalculate pressure dropCalculate HSI

Fraction Inch Converter

Fraction Inch Converter

Fraction Inch Converter

Unit Converter Tool/Difference

Unit Converter*

Unit Converter*

Unit Converter*

Easy Unit Converter

Easily convert between hundreds of units of measurement and currencies with real-time results. Customize your preferred units, perform calculations within the converter, and choose between dark and white themes. Daily currency updates ensure accuracy.

200+ units of measurement conversion30+ currencies conversionReal-time conversion as you type

📊 Productivity

Unit Converter Hero

Unit Converter Hero

Unit Converter Hero

Smart Unit Converter

📊 Productivity

Unit Converter AWG

Unit Converter AWG

Unit Converter AWG

The helping hand for all.

Unit Converter All

Unit Converter All

Unit Converter All

Convert All Unit

Convertura: Unit Converter

Convertura: Unit Converter

Convertura: Unit Converter

Unit Conversion Tool

📊 Productivity

FAQ about Drill Bit Converter

What are the best drill bit converter apps for iPhone?

WS Drill Bits tops our drill bit converter apps ranking as of September 2026, with a 5.0-star average from 2 App Store ratings, and it's free to download.

Are there free drill bit converter apps for iPhone?

Yes — 17 of the top drill bit converter apps we rank are free to download, including WS Drill Bits and Drill Bit Matcher.

Does WS Drill Bits have ads or in-app purchases?

WS Drill Bits has no ads and has no in-app purchases, according to its App Store listing as of September 2026.

How many drill bit converter apps are on the App Store?

We track 250+ drill bit converter apps on the iOS App Store as of September 2026, ranked by rating, recency, and analysis of real user reviews.

What is the range of drill sizes covered by WS Drill Bits?

WS Drill Bits includes a vertical scrolling chart covering drill sizes from 0.1mm (0.00394 Inch) to 101.6mm (4.0 Inches). This range is suitable for a wide variety of machining tasks.

How does WS Drill Bits help with calculating speeds and feeds?

The app calculates recommended drill speeds and feed rates for numerous materials, including various steels, alloys, aluminum, brass, and even wood and plastics. You can input drill sizes in either metric or inch measurements.