# Mohr's Circle — Calculation and Drawing > Calculates and graphs 2D plane stress Mohr's Circles for engineering analysis. (iPhone/iPad app by J.R.Hobbs.) - Source: https://appshunter.io/ios/app/mohrs-circle/id395110520 (this page in markdown: same URL + `.md`) - Developer: [J.R.Hobbs](https://appshunter.io/developer/395110523) - Category: Utilities, Education - Price: $5.99 - Rating: 3.30/5 from 3 App Store ratings · 4 written reviews indexed - Age rating: 4+ - Requires: iOS 12.0 · 8 MB - Languages: American English - Released: 2010-10-03 - Data updated: 2026-07-19 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/mohrs-circle/id395110520/reviews.md ## What is Mohr's Circle? Do you need to perform a Mohr's Circle calculation? Would you like to make sure you Mohr's Circle diagram is correct? With the power of your iOS device and this app, you can do this quickly and easily. (5 Stars) "Perfect…Great tool, great app!" -The fever, the focus Mohr's Circle Calculates: ● 2D Plane Stress Mohr's Circle Solutions ● Max Stress ● Min Stress ● Max Shear Stress ● Average Stress ● Principal Stress Plane Angle ● Max Shear Stress Plane Angle ● The normal stress at an arbitrary angle ● The tangential stress at an arbitrary angle ● The shear stress at an arbitrary angle Mohr's Circle Graphs 4 Views Including: ● Mohr's Circle Diagram ● Stress State Rotated to the Principal Stress Plane ● Stress State Rotated to the Max Shear Stress Plane ● Stress State Rotated to an arbitrary angle Mohr's Circle Features: ● Universal App (Designed for both the iPhone and iPad) ● Share your results via a printout or email ● View the equations used to calculate the results ● Store as many stress states as you want for future reference Units Included! Independently set input and output units both English and Metric. Check out our other engineering apps by searching the App Store for: • Pressure Vessel Pro • Moments of Inertia • Stress Concentrations Pro • Stress Intensity Factors Pro or search J.R.Hobbs to see them all. AppStore.com/JRHobbs ## Key features - 2D Plane Stress Mohr's Circle Solutions - Max, Min, and Shear Stress Calculations - Principal Stress Plane Angle - Mohr's Circle Diagram - Stress State Rotation Views - Shareable Results - Unit Conversion (English/Metric) ## Recent user reviews (4 of 4) All indexed reviews: https://appshunter.io/ios/app/mohrs-circle/id395110520/reviews.md ### 1/5 — Crashes *2015-10-22* The app is unable to cope with 0 shear stress and crashes instantly, An obvious thing to have tested, so consequently you can't have much confidence in the rest of the app. ### 4/5 — Decent *2011-02-18* Would like to be able to rotate the stress block to calculate the stresses on a plane inclined from the horizontal. Otherwise very handy. ### 3/5 — Lacking *2011-01-24* So this app definitely needs more input fields... The only inputs are sigma x and sigma y, which only through trial and error did I figure out was sigma n (normal stress) and sigma s shear stress. In addition there was a field T(x,y). One of the primary use cases of a mohr circle is to find those sigma x and sigma y, so this is kinda backwards for that. Ui design and aesthetics are top notch however. I'll add stars when this app becomes useful. ***update: Please, add support for coulomb failure envelope. And also please add a parameter for pore pressure, making this useful for structural geology. ### 5/5 — Perfect *2010-12-15* Great tool, great app! Shows result in 4 nice graphical views as well as a table for easy reference. Saves information as states for easy lookup later. ## Frequently asked questions about Mohr's Circle ### What is Mohr's Circle used for? Mohr's Circle is a graphical tool used in engineering and physics to represent the stress state at a point in a material. It helps in determining maximum and minimum stresses, shear stresses, and stress transformations at different angles. ### What types of stress calculations does Mohr's Circle perform? Mohr's Circle calculates 2D plane stress solutions, including maximum stress, minimum stress, maximum shear stress, average stress, and principal stress plane angles. It can also determine normal, tangential, and shear stresses at arbitrary angles. ### Can I see the equations used for calculations in Mohr's Circle? Yes, the application allows you to view the specific equations used to derive the calculated results. This can be helpful for understanding the underlying principles and verifying the computations. ### Does Mohr's Circle support different units? Yes, Mohr's Circle includes a unit conversion feature. You can independently set both input and output units to English or Metric, providing flexibility for various engineering contexts. ### How many stress states can I save in Mohr's Circle? The application allows you to store as many stress states as you need for future reference. This feature is useful for managing multiple projects or scenarios without re-entering data. ### On which devices can I use Mohr's Circle? Mohr's Circle is a Universal App, meaning it is designed to work on both the iPhone and iPad. It is also supported on iPod devices. ### How often is Mohr's Circle updated? The latest version of Mohr's Circle is 3.0.3, which was last updated on May 31, 2023. This indicates regular maintenance and potential feature additions. ### What is the price of Mohr's Circle? Mohr's Circle is a paid application, available for $5.99. There are no in-app purchases or advertisements associated with this purchase. ## Version history (last 5 releases) ### 3.0.4 — 2026-07-07 Bug fixes and other minor updates. ### 3.0.3 — 2023-05-31 -Bug fixes -Other minor updates ### 3.0.2 — 2020-01-21 - Bug fixes - Minor updates ### 3.0.1 — 2017-10-18 New 3.0: Mohr's Circle has been completely re-written in Swift and updated to run on modern iOS devices. New features include: - Redesign of the User Interface to match the modern iOS user interface - The ability to set the input parameters and output unit systems (both English and Metric). New in 3.0.1: - Bug Fixes - Minor Updates ### 3.0 — 2017-09-22 Mohr's Circle has been completely re-written in Swift and updated to run on modern iOS devices. New features include: - Redesign of the User Interface to match the modern iOS user interface - The ability to set the input parameters and output unit systems (both English and Metric). ## Apps similar to Mohr's Circle | App | Rating | Price | Category | | --- | --- | --- | --- | | [StemFox Scientific Calculator](https://appshunter.io/ios/app/stemfox-scientific-calculator/id1411592118) | 4.8 (10) | Free | Utilities | | [Polygon: Inertia, Centroid](https://appshunter.io/ios/app/polygon-inertia-centroid/id6469235285) | — | Free | Utilities | | [Metal ONE](https://appshunter.io/ios/app/metal-one/id1524210660) | — | Free | Utilities | | [Statistics Calculator++](https://appshunter.io/ios/app/statistics-calculator-plus-plus/id539195343) | 4.1 (306) | $2.99 | Utilities | | [Steam Tables Pro](https://appshunter.io/ios/app/steam-tables-pro/id906209749) | 1.3 (3) | $4.99 | Utilities | | [Civil Engineering Pack](https://appshunter.io/ios/app/civil-engineering-pack/id671763496) | 4.2 (11) | $19.99 | Utilities | ## More apps by J.R.Hobbs - [Moments of Inertia](https://appshunter.io/ios/app/moments-of-inertia/id494181506) - [Pressure Vessel Pro](https://appshunter.io/ios/app/pressure-vessel-pro/id535696875) - [Inspectix](https://appshunter.io/ios/app/inspectix/id673877248) - [Stress Intensity Factors Pro](https://appshunter.io/ios/app/stress-intensity-factors-pro/id726473168) - [Stress Concentration Factors 2](https://appshunter.io/ios/app/stress-concentration-factors-2/id1296693579) All apps by J.R.Hobbs: https://appshunter.io/developer/395110523 --- *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 2026-07-19.*