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Best Drill Chart Apps

250+ iOS apps curated and reviewed

4.5 avg rating
13 free apps
Updated July 2026

Finding the right drill chart apps can be overwhelming with so many options. We've analyzed 250+ apps to bring you the best choices for 2026, from free options to premium solutions with advanced features.

Compare top Drill Chart Apps (July 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1iEngineeriEngineerFree4.5★ (191)NoYesJul 2026
2Drill Size Charts - Drill bit size tables to show US Number / Letter and Fraction Inch sizes in Decimal Inch and Metric ConversionsDrill Size Charts - Drill bit size tables to show US Number / Letter and Fraction Inch sizes in Decimal Inch and Metric Conversions$0.994.5★ (22)NoNoAug 2026
3FSWizardFSWizardFree4.6★ (47)NoNoJul 2026
4WS Drill BitsWS Drill BitsFree5.0★ (2)NoNoMay 2026
5Drill and Tap Tool - Thread Tapping & Through HoleDrill and Tap Tool - Thread Tapping & Through Hole$1.994.3★ (30)NoNoAug 2026
6Drill SpeedDrill SpeedFree5.0★ (2)NoNoMay 2026
7Drill Bit ConverterDrill Bit Converter$0.99—NoNoJul 2026
8Screw Size & Drill Bit ChartScrew Size & Drill Bit ChartFree—NoNoJul 2026

Top Picks for Drill Chart

iEngineer#1

iEngineer by Perfectly Simple Apps LLC

Editor's Choice
🔍 Reference
4.5😊(191 ratings)
FreeIn-App Purchases
iEngineer screenshot 1
iEngineer screenshot 2
iEngineer screenshot 3
iEngineer screenshot 4
iEngineer screenshot 5

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.

What We Love

  • 🚀 Easy to navigate
  • 👍 Comprehensive information
  • 🔧 Useful for everyday work
  • ⚙️ Essential for engineers and machinists

Room to Improve

  • 🐛 Occasional errors in torque and tensile strength data
  • 💰 Metric information requires paid upgrade
  • 🔍 Missing some thread types like NPT and BSPP
FSWizard#3

FSWizard by Eldar Gerfanov

CNC Machinist Calculator
Worth Considering
📊 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 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.

More Drill Chart apps to explore

4
WS Drill Bits
WS Drill Bits
WS Drill Bits
by Rein Rapp
Free

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.

Drill size and decimal equivalent chartFast vertical scrolling with color-coded valuesSliding scale for quick list navigation
📚 Education
(2)
free
5
Drill and Tap Tool - Thread Tapping & Through Hole
Drill and Tap Tool - Thread Tapping & Through Hole
Drill and Tap Tool - Thread Tapping & Through Hole
by Chewy Applications
$1.99

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.

Metric and US Standard tap/drill supportSpinning dial interface for easy selectionCalculates drill size for tapping
🔍 Reference
(30)
paid
6
Drill Speed
Drill Speed
Drill Speed
Drill Speed Calculator
Free

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
🔍 Reference
(2)
free
7
Drill Bit Converter
Drill Bit Converter
Drill Bit Converter
by Dohmann Engineering Services
$0.99
🔧 Utilities
(0)
8
Screw Size & Drill Bit Chart
Screw Size & Drill Bit Chart
Screw Size & Drill Bit Chart
Pick the right size
Free
🔧 Utilities
(0)
9
Drillstring Toolbox Premium
Drillstring Toolbox Premium
Drillstring Toolbox Premium
by Bureau Veritas North America, Inc.
$24.99
🔧 Utilities
(0)
10
Drill Calc
Drill Calc
Drill Calc
by Black Cat Systems
$2.99

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
🔧 Utilities
(13)
paid
11
DrillOps
DrillOps
DrillOps
DrillOps
Free
💼 Business
(0)
12
TallyBook - Oil & Gas
TallyBook - Oil & Gas
TallyBook - Oil & Gas
Drilling Data Visualisation
Free

This app simplifies the visualization and analysis of drilling data, transforming complex information into understandable visuals. It offers interactive charts and flexible configuration options to uncover insights and improve operational efficiency.

Drilling data visualizationInteractive chartsFlexible chart configuration
💼 Business
(6)
free
13
Drill Bit Matcher
Drill Bit Matcher
Drill Bit Matcher
Find Bit & Pilot Hole Size
Free
🔧 Utilities
(0)
14
Drilling Hydraulics (Basic)
Drilling Hydraulics (Basic)
Drilling Hydraulics (Basic)
Formulas and Calculations
$4.99
📊 Productivity
(0)
15
Drill with Lantern
Drill with Lantern
Drill with Lantern
Drilling productivity software
Free
📊 Productivity
(0)
16
Drill Bit Nozzle Calculator
Drill Bit Nozzle Calculator
Drill Bit Nozzle Calculator
by NOV Inc.
Free

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
💼 Business
(2)
free
17
Drill Collar
Drill Collar
Drill Collar
by zhandos uakanov
$0.99
🔍 Reference
(0)
18
FitCheck: Hole Sizes & Fits
FitCheck: Hole Sizes & Fits
FitCheck: Hole Sizes & Fits
Clearances, threads, & inserts
Free
🔧 Utilities
(0)
19
DrillAR
DrillAR
DrillAR
by Schlumberger Technology Corporation
Free

Explore a life-sized, 3D Schlumberger integrated drilling system. Examine intricate components of bottom-hole assemblies and gain insight into the latest well-drilling technologies used globally.

Life-sized 3D drilling system modelExamine BHA componentsInsight into drilling technologies
📚 Education
(1)
free
20
The ADIA App
The ADIA App
The ADIA App
Drill with confidence
Free
📊 Productivity
(0)

FAQ about Drill Chart

What are the best drill chart apps for iPhone?
iEngineer tops our drill chart apps ranking as of July 2026, with a 4.5-star average from 191 App Store ratings, and it's free to download.
Yes — 13 of the top drill chart apps we rank are free to download, including iEngineer and FSWizard.
iEngineer has no ads and offers in-app purchases, according to its App Store listing as of July 2026.
We track 250+ drill chart apps on the iOS App Store as of July 2026, ranked by rating, recency, and analysis of real user reviews.
iEngineer offers a comprehensive database of screw and bolt information. This includes standard dimensions, material grades, strength properties, recommended torque values, clamp force, and shear force for both US and metric fasteners. It also features a detailed drill chart and unit conversion tools.
The base version of iEngineer includes an extensive database of US screws. Metric screws are available as an in-app purchase, offering a separate, comprehensive set of data for metric fasteners.