# CNC Machinist Calculator Pro

> CNC machining calculator for engineers, machinists, and hobbyists. (iPhone/iPad app by Shane Anderson.)

- Source: https://appshunter.io/ios/app/cnc-machinist-calculator-pro/id1037668281 (this page in markdown: same URL + `.md`)
- Developer: [Shane Anderson](https://appshunter.io/developer/1037668280)
- Category: Productivity, Utilities
- Price: $14.99
- Rating: 4.70/5 from 669 App Store ratings · 86 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.2 · 47 MB
- Languages: American English
- Released: 2015-09-25
- Data updated: 2026-08-26
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/cnc-machinist-calculator-pro/id1037668281/reviews.md

## What is CNC Machinist Calculator Pro?

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

## Key features

- 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

## Chart rankings

- #69 in Top Paid · Productivity (US App Store)

## What do users think of CNC Machinist Calculator Pro?

Overall sentiment: positive

**Pros**

- 🚀 Useful for thread data
- 👍 Helpful for programming mills and designing fixtures
- 👍 Provides all the technical data needed
- 👍 Great resource for learning as a beginner machinist
- 👍 Fantastic machinist reference and calculator
- 👍 Saves time in setup work
- 👍 Comprehensive and easy to use
- 👍 Invaluable for the modern machine shop employee

**Cons**

- 🐛 No more support or new features
- 🐛 No easy reference chart for threads
- 🐛 Calculator issues with mathematical operations
- 🐛 Clunky UI and slow animations
- 🐛 Pauses music when opened
- 🐛 Thermal expansion calculator glitchy

**Commonly reported bugs**

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

**Most requested features**

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

## Recent user reviews (10 of 86)

All indexed reviews: https://appshunter.io/ios/app/cnc-machinist-calculator-pro/id1037668281/reviews.md

### 5/5 — Useful for the thread data alone

*2025-09-11*

I use this app for various things, but it’s worth it for the thread data alone. If you’re single pointing a lot of threads, it’s very handy to have thread data at your fingertips.

### 3/5 — No more support

*2025-03-06*

I would have given this 5 stars a few years ago. It’s a great app and has a lot of useful information, but the creators of it seem to have abandoned it and aren’t adding any more features. Which is a shame cause this is my go to apps for machinist reference.

### 5/5 — Must have

*2024-12-27, version 19*

I use this app every day programming mills and designing fixtures

### 1/5 — If I reviewed you once, don’t ask a second time

*2024-05-30, version 18*

I bought this app several years ago.  I  gave them a 5 star review the first time.  They ask me every month for another review. Now you get 1 star.

### 5/5 — Programmer

*2024-05-02, version 18*

Absolutely love it!!! All the information I need at my fingertips.

### 5/5 — Cnc machinist pro

*2024-04-04*

Wow.. do I love the brain check portion of this app.. I failed miserably only to memorize the answers and pass all 100%. Would love a new updated version with potentially harder questions and answers.! Love it love it love it. 

Btw .. recently used the Material weight calculator to ensure that I had enough lifting power for my new 990.2 lbs chunks of 6061 aluminum! Thank you designers and hosts for this app!

### 5/5 — Love the app

*2024-03-21, version 18*

I’m a machinist in training still learning and making mistakes, this app helps me a lot with speeds and feed and some of the things I didn’t consider before.

### 5/5 — Good

*2023-06-12, version 18*

Good

### 5/5 — Review

*2023-06-06*

This has everything I need all in one I’ve got 28 years of experience and I e always had to do research for data to have an edge. Now I have all the technical data I could ask for!

### 1/5 — No thread chart

*2023-05-26, version 18*

No easy reference chart for threads with major and minor diameters etc. you have to go through multiple menus to look up a specific tap or thread size

## Frequently asked questions about CNC Machinist Calculator Pro

### What does the CNC Machinist Calculator Pro app do?

This app is a specialized calculator designed for professionals and hobbyists in the CNC machining field. It offers a wide range of tools for performing quick calculations related to turning, milling, drilling, threading, geometric tolerances, and more, aiding in programming, operation, and quoting.

### What are the key features of this machining calculator?

Key features include dedicated calculators for turning, milling, and drilling operations, along with tools for thread calculations, bolt patterns, surface finish, and blueprint geometric tolerance descriptors (GD&T). It also provides material data, unit conversions, and the ability to export G-code for specific features.

### How much does CNC Machinist Calculator Pro cost?

Based on the provided information, this application is a paid app. There is no mention of free versions, subscriptions, or in-app purchases, indicating a one-time purchase model.

### Who is the target audience for this app?

The app is intended for manufacturing engineers, machinists, CNC operators, tool and die makers, and even at-home hobbyists who require precise calculations for CNC machining tasks. It's useful for both professional work and personal projects.

### Can this app help with quoting new work?

Yes, the app is described as a great tool for quoting new work. Its comprehensive calculation features for various machining operations, material properties, and cycle times can help users accurately estimate costs and feasibility for new projects.

## Version history (last 5 releases)

### 19 — 2024-10-05

Bug Fixes

### 18 — 2020-03-19

Added Acme thread data, STI Thread data for Helicoils, and a max RPM field to the effective diameter calculation

### 17 — 2019-03-14

Added Scientific Calculator Functions
Added Thermal Expansion Calculator
Added Grinding calculations 
Added max RPM to milling speed & feed rate calculator
Changed milling feed rate to automatically adjust based on endmill diameter
Added inch/metric button within settings screen

### 16 — 2019-01-21

Added Spanish translations
Added option to use icons on the category buttons

### 15 — 2018-12-14

Improved load time and button response in "Mill Calc" section

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## More apps by Shane Anderson

- [CNC Machinist Calculator Ultra](https://appshunter.io/ios/app/cnc-machinist-calculator-ultra/id6474093839)

All apps by Shane Anderson: https://appshunter.io/developer/1037668280

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-26.*