# Bolt Hole Circle Calculator > Calculates bolt hole circle coordinates for engineering and machining. (iPhone/iPad app by ITAMCO.) - Source: https://appshunter.io/ios/app/bolt-hole-circle-calculator/id587068320 (this page in markdown: same URL + `.md`) - Developer: [ITAMCO](https://appshunter.io/developer/374298152) - Category: Utilities, Productivity - Price: $0.99 - Rating: 4.29/5 from 24 App Store ratings · 6 written reviews indexed - Age rating: 4+ - Requires: iOS 9.0 · 17 MB - Languages: English - Released: 2012-12-23 - Data updated: 2026-06-10 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/bolt-hole-circle-calculator/id587068320/reviews.md ## What is Bolt Hole Circle Calculator? Bolt Hole Circle Calculator is a simple app to calculate coordinates of a bolt hole circle given the number of holes and X Y coordinates to begin. Great for Machinist, Engineers, CNC Operators. This app was developed by ITAMCO, please visit http://www.itamco.com for more information ## Key features - Calculate bolt hole circle coordinates - Input number of holes - Specify starting X/Y coordinates - Designed for machinists - Useful for engineers - Supports CNC operators ## Recent user reviews (6 of 6) All indexed reviews: https://appshunter.io/ios/app/bolt-hole-circle-calculator/id587068320/reviews.md ### 1/5 — Used to work great...... *2018-08-30, version 1.1.4* When I first got this app it worked great but for the last 6 months or so and through a second phone it doesn’t. Upon entering your number of holes and radius after hitting calculate the app just closes. ### 2/5 — Not working *2018-02-23, version 1.1.4* It did work on iOS 11 until update now it leaves keyboard on screen, which hides info They finally fixed the app. Works well now. Be nice if they would bring all their other paid apps up to date. **Developer response:** Thank you for bringing this to our attention. We have submitted a new version to correct this issue and it should hit the app store as soon as it is reviewed by Apple. ### 5/5 — Bolt hole calculator *2014-11-13, version 1.1.1* Very simple. Works great. ### 1/5 — Doesn't make sense *2014-03-04, version 1.1.0* It doesn't make sense that you would make a bolthole calculator that doesn't allow you to put decimal points if we lived in a nominal world where nothing was in half degrees or quarter inches or whatever we see fit your bolthole pattern it would be great but that's not the world especially the world of machinist so sorry you need to work on your app tremendously ### 5/5 — Great App! *2013-03-12, version 1.0.0* This is a great app for calculating bolt hole circles on the fly! Automatically calculates the angle based off how many bolt holes and radius. Highly Recommend! Must Have! ### 1/5 — Just aweful *2013-01-16, version 1.0.0* I've been a machinist for 21 year and this app is just awful. It would be useable if you could actually fill in all the fields but as it I the angle field is unusable and just picks random offsets. Deleted immediately. ## Frequently asked questions about Bolt Hole Circle Calculator ### What is Bolt Hole Circle Calculator used for? Bolt Hole Circle Calculator is used to determine the precise coordinates for bolt holes in a circular pattern. It's designed for professionals in machining and engineering fields. ### How do I use Bolt Hole Circle Calculator? You input the desired number of holes and the starting X/Y coordinates. The app then calculates and provides the coordinates for each bolt hole in the circle. ### Who developed Bolt Hole Circle Calculator? Bolt Hole Circle Calculator was developed by ITAMCO, a company that provides information and resources for manufacturing professionals. ### What devices does Bolt Hole Circle Calculator support? Bolt Hole Circle Calculator is available for iPhone and iPad devices. ### How much does Bolt Hole Circle Calculator cost? Bolt Hole Circle Calculator is a paid app, priced at $0.99. ### When was Bolt Hole Circle Calculator last updated? The latest version of Bolt Hole Circle Calculator was released on September 14, 2018. It was originally released on December 23, 2012. ### What is the age rating for Bolt Hole Circle Calculator? Bolt Hole Circle Calculator has an age rating of 4+, making it suitable for a wide range of users. ### Does Bolt Hole Circle Calculator have ads? Based on the provided information, there is no indication of advertisements within the Bolt Hole Circle Calculator app. ## Version history (last 1 release) ### 2.0.1 — 2018-09-14 added compatibility for devices iOS 9.0+ ## Apps similar to Bolt Hole Circle Calculator | App | Rating | Price | Category | | --- | --- | --- | --- | | [Flat Pattern Bend Calculator](https://appshunter.io/ios/app/flat-pattern-bend-calculator/id1361485922) | 4.7 (147) | Free | Utilities | | [YCNGA App](https://appshunter.io/ios/app/ycnga-app/id1394066785) | 1.1 (8) | Free | Utilities | | [Ballistics](https://appshunter.io/ios/app/ballistics/id1150935669) | 4.5 (60) | Free | Utilities | | [Vortex Tool Co.](https://appshunter.io/ios/app/vortex-tool-co/id908151886) | 3.8 (4) | Free | Utilities | | [CalPrint](https://appshunter.io/ios/app/calprint/id400413694) | 4.8 (265) | $1.99 | Utilities | | [HP 15c Calculator](https://appshunter.io/ios/app/hp-15c-calculator/id503720774) | 4.8 (168) | $14.99 | Utilities | ## More apps by ITAMCO - [Feed Rate Calculator](https://appshunter.io/ios/app/feed-rate-calculator/id376358618) - [MTConnect](https://appshunter.io/ios/app/mtconnect/id379444795) - [Metal Weight Calculator Lite](https://appshunter.io/ios/app/metal-weight-calculator-lite/id583890206) - [Feed Rate Calculator Lite](https://appshunter.io/ios/app/feed-rate-calculator-lite/id583892954) - [Concrete Calc Mobile Lite](https://appshunter.io/ios/app/concrete-calc-mobile-lite/id583896006) All apps by ITAMCO: https://appshunter.io/developer/374298152 --- *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 2026-06-10.*