# Machinist Calc Pro — Machining Math Calculator > Machining calculator for speeds, feeds, threads, and trigonometry with US/Metric support. (iPhone/iPad app by Calculated Industries.) - Source: https://appshunter.io/ios/app/machinist-calc-pro/id596584456 (this page in markdown: same URL + `.md`) - Developer: [Calculated Industries](https://appshunter.io/developer/370406449) - Category: Utilities, Productivity - Price: $24.99 - Rating: 3.67/5 from 3 App Store ratings · 18 written reviews indexed - Age rating: 12+ - Requires: iOS 15.0 · 14 MB - Languages: English - Released: 2013-01-31 - Data updated: 2026-08-20 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/machinist-calc-pro/id596584456/reviews.md ## What is Machinist Calc Pro? Ideal for machining pros, machine setters, tool and die makers, production engineers, shop managers and shop owners who want to increase productivity and profits in the design, layout and set-up stages of production and reduce wear and tear on costly cutting tools. And while perhaps obvious, if you change from an iOS device to a non-iOS device, you WILL need to buy a new license as they are incompatible. The Machinist Calc Pro is the first machining math and reference tool to provide a complete assortment of machine shop solutions. It has more complete Thread data than the Machinery's Handbook, including step-saving Thread and Drill Size chart look-ups, speeds and feeds, right triangle solutions, bolt patterns and much more. Spend more time machining and less time looking up specs and data in books, on charts or in computer programs. FEATURES: • Created by Calculated Industries, the originator of the award-winning Construction Master calculators • Built-in help, just press and hold a key • All the functionality and solutions of the handheld Machinist Calc Pro calculators and optimized for the iPhone device user • Entry Editing Backspace Key – with a swipe of a finger (left - to - right) • A complete User’s Guide is available free at www.calculated.com DEDICATED FUNCTIONS: • Speeds and Feeds - Calculate for Milling, Turning and Drilling; Spindle Speed (RPM), Feed Rate (IPM), Cut Speed, Cut Feed, Feed per Tooth, Number of Teeth and Radial Chip Thinning adjustment factor • Thread Size - Enter numeric, fractional or metric thread sizes and display tap, roll tap, close and free fit drill sizes. Display pitch, major and minor diameters • Drill Point - Enter the cutting angle and Drill Size and calculate the Drill Point cut depth • Drill Size - Enter numeric, letter, fractional or metric Drill Size and display the closest fitting Drill Size and scroll through available drill sizes • 3-Wire Measure - Enter Wire Size (or use calculated Best Wire size) and 3-Wire Measurement to calculate pitch diameter • Trigonometric Functions - Sine, Cosine, Tangent, Arcsine, Arccosine, Arctangent • Right Triangle Math - Enter, calculate Angle, Hypotenuse, Opposite and Adjacent side lengths Additional Features: • Thread Classification Tables ◦U.S. - Internal (3) 1B, 2B, 3B - External (3) 1A, 2A, 3A ◦Metric - Internal (14) 3G-9G and 3H-9H - External (28) 3g-9g, 3h-9h, 3e-9e, 3f-9f • U.S. and Metric Unit Entries and Conversions ◦Decimal Inches/mils ◦Feet-Inch-Fractions ◦m, mm, cm ◦Area, Volume and Weight • Works as a Standard Calculator TRADEMARKS: Machinist Calc® is a registered trademark of Calculated Industries, Inc. ## Key features - Speeds and Feeds calculations - Thread size and drill size look-ups - Trigonometric functions - Right triangle math - US and Metric unit conversions - Built-in help ## Recent user reviews (10 of 18) All indexed reviews: https://appshunter.io/ios/app/machinist-calc-pro/id596584456/reviews.md ### 1/5 — Conversions *2022-02-13* Why did you completely ruin the conversion feature in the Machinist Calc app? It worked wonderfully, input a number followed by IN or MM and then press the opposite IN or MM to get the result. I used this ALL the time, now I regret buying this app. ### 5/5 — Construction master *2018-10-21* I have used the actual construction master calculator for decades and now that it’s an app. Less gadgets to carry!! The best . Try all their apps ### 1/5 — Does not work anymore *2015-07-06* I bought the calculator and then the app. The app worked at first but then they updated it. Now it doesn't work at all, good thing I have the handheld calculator. Would rate this a negative star but it doesn't go down that low. ### 2/5 — mm to inch conversion *2015-05-18* This is a function I use literally hundreds of times a day when looking at blueprints. Whatever update occurred caused this to no longer work. For example I should be able to press 1 then inch then mm and get 25.4 as a solution. Now it just changes from 1 inch to 1 mm. Was a really great app with handy features. Not sure now what all has been changed. Please restore functionality. Would have been 5 stars had I not lost my favorite feature. Still gets a 4 though. I've used it for 6 months with no other issues. ***Still not fixed. Down to 2 stars. Luckily I have the calculator version in my toolbox for redundancy. The new version works but it's a shame you will not fix this one for people who already have it. ### 1/5 — No longer works! *2015-03-19* I liked this app before the latest update. It could have had a few features to make things easier to enter like thread data. You have to remember a lot of key strokes in the correct order. Since the update, thread data doesn't work. Unit conversion doesn't work as well as other common features. It now has about the same functionality as the Apple one included with your phone but expensive Apple. ### 1/5 — Thread info *2015-03-18* Latest update has caused all thread info to be lost in the app rendering it useless. ### 5/5 — Great app *2015-03-14* This is really a great app, but next time you update it please don't change the units without asking, it completely screws things up and it's not immediately obvious what caused the problem. ### 1/5 — MATH ERROR ! CRASH !!!! *2015-03-14, version 1.1.0* Errors occurred after the new update. FIX IT please ! ### 1/5 — Crashes!!! *2015-03-14, version 1.1.0* This app was very good. The recent update has broken the app. When you try and make a calculation the app exits to the home screen making this app totally useless! Then to top off there is a new version of this app which costs £22. I only purchased this original app a month or so ago and I recent having to pay again to get the latest version. Seems a rip off to me. Shame pure greed in my eyes. ### 5/5 — Essentiel! *2014-02-14, version 1.0.3* Je l'utilise afin d'éviter de faire des erreurs en faisant la conversion des cotes en mesures impériales et métriques. On peut entrer des cotes dans n'importe quel système, faire des opérations arithmétiques sur ces dernières et obtenir le résultat en pouces ou mm instantanément sans se tromper. Pratique pour calculer les avances et RPM de coupe sur la fraiseuse conventionnelle. Les fonctions trigos sont simples à utiliser, tout comme les fonctions pour les forets, tarauds et filières. Finalement, la fonction localisation des trous de boulons sauve du temps. La calculatrice est toujours à portée de main dans mon coffre à outil et l'app sur l'iPod touch dans le bureau quand je révise les plans. Ça se paye tout seul par les erreurs évitées. ## Frequently asked questions about Machinist Calc Pro ### What is Machinist Calc Pro? Machinist Calc Pro is a specialized calculator app designed for machining professionals. It offers a wide range of functions to assist with calculations for speeds, feeds, thread sizes, and trigonometric problems, aiming to improve efficiency in the workshop. ### Is Machinist Calc Pro free? No, Machinist Calc Pro is a paid application. It is priced at $24.99 and does not feature advertisements or in-app purchases. ### What kind of machining calculations can Machinist Calc Pro perform? Machinist Calc Pro can calculate speeds and feeds for milling, turning, and drilling, determine thread sizes and corresponding drill sizes, calculate drill point depths, perform 3-wire measurements, and solve trigonometric functions and right triangle math. ### Does Machinist Calc Pro support both US and Metric units? Yes, Machinist Calc Pro supports both U.S. and Metric unit entries and conversions. This includes decimal inches/mils, feet-inch-fractions, meters, millimeters, centimeters, and conversions for area, volume, and weight. ### What devices is Machinist Calc Pro compatible with? Machinist Calc Pro is designed for iOS devices, including iPhone, iPad, and iPod. Please note that licenses are not transferable between iOS and non-iOS devices. ### How often is Machinist Calc Pro updated? The latest version of Machinist Calc Pro is 10.2.3, which was last updated on January 21, 2023. Updates typically include bug fixes and feature enhancements. ### What is the age rating for Machinist Calc Pro? Machinist Calc Pro has an age rating of 12+. This indicates it is suitable for users aged 12 and older. ### Where can I find a user guide for Machinist Calc Pro? A complete user's guide for Machinist Calc Pro is available for free on the developer's website at www.calculated.com. ## Version history (last 5 releases) ### 10.3.0 — 2026-06-04 Compliance updates. ### 10.2.3 — 2023-01-21 Ongoing maintenance. ### 10.2.0 — 2019-05-22 1. New Menu 2. What's New Pages 3. Units from upper display fixed on tape 4. Misc Backlog bugs ### 1.1.3 — 2015-10-02 Change to app data storage location. ### 1.1.2 — 2015-05-08 Minor bug fixes. ## Apps similar to Machinist Calc Pro | App | Rating | Price | Category | | --- | --- | --- | --- | | [E-Calc USA](https://appshunter.io/ios/app/e-calc-usa/id6502258186) | 5.0 (1) | $14.99 | Utilities | | [Drill Calc](https://appshunter.io/ios/app/drill-calc/id304434324) | 4.1 (19) | $2.99 | Utilities | | [Construction Calculator Master](https://appshunter.io/ios/app/construction-calculator-master/id1623283646) | 4.3 (436) | Free | Utilities | | [Duct Calculator](https://appshunter.io/ios/app/duct-calculator/id1078238132) | 4.5 (188) | $19.99 | Utilities | | [Construction Calculator++](https://appshunter.io/ios/app/construction-calculator-plus-plus/id749110889) | 4.2 (49) | $2.99 | Utilities | | [Construction Calc Pro 2](https://appshunter.io/ios/app/construction-calc-pro-2/id6446281301) | 4.5 (6) | $13.99 | Utilities | ## More apps by Calculated Industries - [Boater's Pocket Reference](https://appshunter.io/ios/app/boaters-pocket-reference/id323913317) - [Navy SEAL Fitness](https://appshunter.io/ios/app/navy-seal-fitness/id324155166) - [I.D. Wood](https://appshunter.io/ios/app/id-wood/id325838725) - [Army First Aid](https://appshunter.io/ios/app/army-first-aid/id326842780) - [Navigation Rules](https://appshunter.io/ios/app/navigation-rules/id327936562) - [Hand-to-Hand Combat](https://appshunter.io/ios/app/hand-to-hand-combat/id330023291) All apps by Calculated Industries: https://appshunter.io/developer/370406449 --- *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 2026-08-20.*