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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

What’s New

Version 18

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

Ratings and Reviews

4.6 out of 5
362 Ratings

362 Ratings

Big Loui ,

Super useful for machining

I use this app for turning and milling. It’s great for computing speeds and also for referencing items. Aside from calculations there is a lot of information contained in this app if you know where to look for it. Wish it had Involute gear and rotating table calculations maybe in some future release. Definitely worth the price, great to have all this specialized information in your pocket for those times you are at the machining table and don’t feel like pulling out the big books!

ojoazul ,

Button presses are abysmal

There are quite a few good utilities here though the UI has one major flaw and several areas that need improvement. The major flaw is that it takes multiple presses on the buttons for data entry. A friend recommended the app to me but warned me of this problem. I didn’t realize how serious it was. Also in some case the button location is not correct so one has to press slightly above (or below) the location of the button to get the correct entry. Really, THIS NEEDS TO GET FIXED!! This app is not worth the money until this problem is resolved! No other app I have ever used has a basic data entry problem like this, please fix it. The app would get four stars if this problem was fixed. I tend not to use it because of this. The other problems are order-of-event issues with the UI, but they pale in comparison the the button entry issue.

Developer Response ,

Hello ojoazul - Please try the newest version of the app. It was released 11/08/18. This should fix your issue. Email me at shanesuan2@gmail.com if you have any problems.

Rod Ferro ,

Great App

I’ve used this app daily since I purchased it. It has worked flawlessly. All the issues mentioned in older reviews have been corrected. The developer seems to one of the rare ones that actually cares about his product. I would like to see the addition of a drill point length calculator. Just a simple version where you can enter drill diameter and point angle, and it will give you the point length. If you are a machinist or manufacturing engineer this is a handy app.

Developer Response ,

Thank you Rod. The drill point length calculator can be found in the "DRILL CALC" section. Just scroll down 👍

App Privacy

The developer, Shane Anderson, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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