Comparison

CNC Machinist Calculator Pro vs ThreadKing

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

CNC Machinist Calculator Pro

This app provides a comprehensive suite of calculators and tools for CNC machinists, engineers, and hobbyists. It offers specialized calculations for turning, milling, drilling, threading, and geometric tolerances, along with material data and G-code generation.

Highlights
  • Turning, Milling, and Drilling Calculators
  • Thread and Bolt Pattern Calculators
  • Geometric Tolerance (GD&T) Tools
  • Material Property and Weight Calculator
  • G-code Export for Chamfers and Tapers
  • Unit and Hardness Converters
  • Machinist Forum and Test
Features
Currently charting
Read full description

CNC Machinist Calculator Pro is a machining calculator designed for manufacturing engineers, machinists, CNC operators, tool & die makers, and at home hobbyists. CNC Machinist Calculator Pro is great for CNC programmers or machine operators who need to make quick calculations on the fly. It's also a great tool for quoting new work. Visit www.cncdirt.com for more info This CNC machining calculator app includes the following features: 1. Turning Calculators for lathe operators *Cutting Speed Calculation by Material *Grooving/Cut off cycle time Calculation *Rough turn cycle time Calculation *Cutting Speed Calculations *Cutting speed to RPM conversions *Feed per rev - Feed per minute conversions 2. Milling Calculators for mill operators *Cutting Speed & Feed Calculation by Material *RPM to Cutting Speed Conversions *Feed per Minute - Feed per tooth Conversions *Radial Chip Thinning Calculation *Metal Removal rate Calculation *Milling cut time Calculation *Circle Milling Calculations - Both inner & outer *Ball Mill Cusp Height Calculation *Ball Mill Effective diameter/Chip Thinning Calculator *Thread Milling Calculations - Both inner & outer 3. Drilling Calculators *Cutting Speed Calculation by material *Cycle time calculation *Drill point Length calculation 4. Gun drilling Calculators *Cutting Speed Calculation by material *Cycle time calculation 5. Thread Calculators 6. True Position Calculators 7. Bolt Pattern Calculators 8. Surface Finish Calculators 9. Drill & Tap charts 10. Thread data for the following threads: * 60° Threads (Pitch Ø, Minor Ø, Major Ø, Helix, Lead, etc.) * NPT Threads * Acme Threads * STI Threads 11. Thread over 3 wire info (Size limits, min, max, & best wire) 12. Center drill dimensions 13. Unit converter 14. Hardness conversions 15. G-codes 16. M-codes 17. Blue Print Geometric Tolerance Descriptors - GD&T 18. SFM calculator for drilling, milling, & turning over 170 materials 19. Tap Drill Calculator for roll form & cut taps 20. Various Geometric calculators 21. Triangle Solver 22. CNC keyway calculator 23. Custom macro variables, logic, arguments, & arithmetic data 24. Machinist Forum 25. Export G-code for internal & external chamfers, tapers, & radii with tool nose comp. 26. Circle segment calculator ( arc calculator ) 27. National Pipe Thread data - NPT threads 28. Material Property Search with machinability info 29. Material Weight Calculator for over 170 materials & 10 shapes 30. Tool Wear section with images helpful info to improve tool life 31. Machinist Test with 6 categories to test your strengths & weaknesses 32. Socket Head Cap Screw hole dimensions 33. Scientific Calculator which includes: * sine (sin) * cosine (cos) * tangent (tan) * arcsine (sin-1) * arccosine (cos-1) * arctangent (tan-1) * square (x²) * cube (x³) * pi (π) * square root (√) * base 10 logarithm (log) * exponential function (ex) * natural logarithm (In). 34. Linear Thermal Expansion Calculator 35. Grinding Calculations * Plunge Grind - Q Prime, grit penetration & aggressiveness * Surface Grind - Q Prime, grit penetration & aggressiveness * Grinding Wheel Velocity * Work piece Velocity * Work piece RPM to wheel RPM ratio cylindricity error calculator * Wheel Mesh (Grit) size conversion * Equivalent wheel diameter 36. More to come... We're quickly becoming the best engineering calculator on the market Check us out at www.cncdirt.com

About

ThreadKing

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.

Highlights
  • Metric and UN thread reference
  • Drill/Tap size charts
  • Pipe thread information
  • Cutting tap calculator
  • Forming tap calculator
  • RPM and feed rate calculator
  • Thread dimension details
Features
Read full description

ThreadKing is the ultimate reference and calculator for threads. It contains all the information for Metric and UN Taps, Fine/Course Threads, Drill/Tap sizes, Pipe Tap sizes, and Thread Dimension. ThreadKing is also a handy calculator for finding the right drill size in Cutting Tap and Forming Tap based on Thread Percentage. Besides, it calculates RPM and feed rates in Cutting Tap for different materials FEATURES: - Drill/Tap Chart available in drill size standards: Fractional, Letter, Wire Gauge and Metric - Course and Fine Thread - Pipe Thread Chart - Cutting Tap Calculator based on Thread Percentage - Forming Tap Calculator based on Thread Percentage - Cut Tapping RPM and Feed Rate Calculator - Thread Dimension Information: Major Dia, Pitch Dia, Minor Dia, Pitch, Thread Height, Threads per Inch - Formular and Equations for Reference

Screenshots

CNC Machinist Calculator Pro4 screens
ThreadKing4 screens

Verdict

The call

The clearest difference is price: ThreadKing at Free against CNC Machinist Calculator Pro's $14.99. ThreadKing also leads on update cadence (every 6 days vs every 2 months) and review sentiment (100% vs 84%). CNC Machinist Calculator Pro's advantage is ratings volume (680 vs 13) and chart position (#57 vs unranked). On rating, ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

ThreadKing is free to download; CNC Machinist Calculator Pro costs $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.7 for CNC Machinist Calculator Pro against 4.7 for ThreadKing. That said, the two scores are not equally well evidenced: CNC Machinist Calculator Pro has 680 ratings behind it against 13, so its average is the more settled of the two. Written reviews are what separate them: 84% of CNC Machinist Calculator Pro's written reviews are positive against 100% of ThreadKing's.

UpkeepUpdate frequency

CNC Machinist Calculator Pro ships an update every 2 months, ThreadKing every 6 days. Both last shipped on October 29, 2026.

Scorecard7 real differences · 4 level
CNC Machinist Calculator Pro versus ThreadKing: the parameters behind the verdict, then further details
ParameterCNC Machinist Calculator ProThreadKing
Price$14.99Free — better
Rating4.7 (680 ratings) — better4.7 (13 ratings)
Positive reviews83.9% of reviews100.0% of reviews — better
Number of ratings680 — better13
Update frequencyEvery 2 monthsEvery 6 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
Best chart rank#57 — better—
DevicesiPhone, iPodiPhone, iPod
Requires iOS12.28.1 — better
Further details — not scored
Size47 MB7 MB
Age rating4++4
DeveloperShane AndersonMotionics LLC

Customer experience

CNC Machinist Calculator Pro

All ratings679 ratings
Positive95.4%
Neutral1.9%
Negative2.7%
Written reviews87 reviews
Positive83.9%
Neutral6.9%
Negative9.2%

ThreadKing

All ratings13 ratings
Positive92.3%
Neutral7.7%
Negative0.0%
Written reviews10 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

CNC Machinist Calculator Pro

Reported bugs

3 issues
  • Bolt hole calculations incorrect
  • Thermal expansion option not working properly
  • Compatibility issues with newer iPhone models

Requested features

9 requests
  • Cylindrical grinding calculator
  • Tool nose compensation for lathe
  • Acme thread calculator
  • G2/G3 configuration for milling
  • Drill point length calculator
Show 4 more
  • Keensert and Helicoil drill/tap data
  • G and M code dictionary
  • Ceramic tool material support
  • Carbon fiber, fiberglass, and common plastics in feeds/speeds

ThreadKing

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

CNC Machinist Calculator Pro

No in-app purchases

None

ThreadKing

No in-app purchases

Questions

Is CNC Machinist Calculator Pro free?
CNC Machinist Calculator Pro costs $14.99, with no in-app purchases.
Is ThreadKing free?
ThreadKing is free to download, with no in-app purchases.
Which has better reviews, CNC Machinist Calculator Pro or ThreadKing?
CNC Machinist Calculator Pro is rated higher. CNC Machinist Calculator Pro averages 4.7 out of 5 from 680 ratings, while ThreadKing averages 4.7 from 13 ratings.
Do CNC Machinist Calculator Pro or ThreadKing have ads?
Neither CNC Machinist Calculator Pro nor ThreadKing shows ads.
Which is updated more often, CNC Machinist Calculator Pro or ThreadKing?
CNC Machinist Calculator Pro ships an update every 2 months, and ThreadKing every 6 days. Most recently, CNC Machinist Calculator Pro was updated on October 29, 2026 and ThreadKing on October 29, 2026.

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