# Triangle Calculator — Right angle triangle solver > Right-angle triangle solver for lengths, angles, area, and perimeter. (iPhone/iPad app by Kent Johansson.) - Source: https://appshunter.io/ios/app/triangle-calculator/id1571268914 (this page in markdown: same URL + `.md`) - Developer: [Kent Johansson](https://appshunter.io/developer/1463036879) - Category: Productivity, Utilities - Price: Free - Rating: 5.00/5 from 2 App Store ratings · 3 written reviews indexed - Age rating: 17+ - Requires: iOS 8.0 · 4 MB - Languages: English - Released: 2021-06-08 - Data updated: 2026-06-04 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/triangle-calculator/id1571268914/reviews.md ## What is Triangle Calculator? The application calculates the lengths, angles, area and perimeter of a right-angle triangle when only 2 values are known. A proportionally correct triangle is drawn according to calculations. The proportions of the triangle are consciously incorrect if any angle is too small. If the proportions are not OK a message alerts you to this. The shown triangle can be rotated and flipped. The number of decimals for lengths, angles, area and perimeter (according to lengths) can be specified. Note that the results may be rounded if they are to be used! It is possible to reuse and edit the most recently entered values after clearing. It is possible to change the color theme on backgrounds. Note that the results are given with a maximum of ~15 significant digits (all calculations are made in 64-bit double precision). ## Key features - Calculates lengths, angles, area, perimeter - Draws proportionally correct triangles - Adjustable decimal precision - Rotates and flips triangle visualization - Alerts for incorrect proportions - Reuses and edits recent values - Customizable color themes ## Recent user reviews (3 of 3) All indexed reviews: https://appshunter.io/ios/app/triangle-calculator/id1571268914/reviews.md ### 5/5 — Amazing *2026-03-09* Hands down amazing app I’m a machinist and use this app constantly when drafters are missing information on angles on prints ### 5/5 — Perfect! *2024-11-10* Excellent, just what I was looking for for my wood working projects. Simple to use and clutter free, so useful for calculating angles for jigs etc as well. Big thanks to the designer 👍🏻😊 ### 4/5 — James *2022-03-21* Easy to use and precise, James, New Zealand 👍 ## Frequently asked questions about Triangle Calculator ### What calculations can Triangle Calculator perform? Triangle Calculator can compute the lengths of sides, angles, area, and perimeter of a right-angle triangle. It provides results with up to approximately 15 significant digits, calculated using 64-bit double precision. ### Does Triangle Calculator have ads? No, Triangle Calculator is ad-free. It does not contain any advertisements, allowing for an uninterrupted user experience. ### What devices is Triangle Calculator available on? Triangle Calculator is available on iPhone, iPad, and iPod touch devices. It is designed for the iOS ecosystem. ### How does Triangle Calculator handle incorrect triangle proportions? If the calculated proportions of a triangle are not valid, Triangle Calculator will display a message to alert the user. This helps ensure the accuracy of the geometric representation. ### Can I customize the appearance of the triangle in Triangle Calculator? Yes, you can change the color theme of the backgrounds within Triangle Calculator. This allows for a personalized visual experience. ### Is Triangle Calculator suitable for users of all ages? Triangle Calculator has an age rating of 17+. While it is a mathematical tool, the age rating may reflect the complexity of the concepts or the platform's guidelines. ### How often is Triangle Calculator updated? Triangle Calculator was last updated on June 8, 2021, with version 1.0.0. As of the provided data, there is no information on its update frequency beyond this initial release. ### Can I reuse previous calculations in Triangle Calculator? Yes, Triangle Calculator allows you to reuse and edit the most recently entered values after clearing them. This feature enhances efficiency for repeated calculations. ## Version history (last 1 release) ### 1.0.0 — 2021-06-08 No release notes. ## Apps similar to Triangle Calculator | App | Rating | Price | Category | | --- | --- | --- | --- | | [Milwaukee® Heated Gear](https://appshunter.io/ios/app/milwaukee-heated-gear/id6443679661) | 4.1 (11) | Free | Productivity | | [Pipedata](https://appshunter.io/ios/app/pipedata/id967807250) | 4.3 (39) | Free | Productivity | | [Fraction Calculator](https://appshunter.io/ios/app/fraction-calculator/id1078884704) | 4.7 (90) | Free | Productivity | | [Conversion Calculator !](https://appshunter.io/ios/app/conversion-calculator/id417794697) | 4.6 (13,159) | Free | Productivity | | [Fraction Calculator Plus #1](https://appshunter.io/ios/app/fraction-calculator-plus-1/id580778301) | 4.9 (21,757) | Free | Productivity | | [Walter Feeds & Speeds](https://appshunter.io/ios/app/walter-feeds-and-speeds/id454963587) | 2.4 (8) | Free | Productivity | ## More apps by Kent Johansson - [Turning Cut Calculator II](https://appshunter.io/ios/app/turning-cut-calculator-ii/id1463036880) - [Milling Cut Calculator II](https://appshunter.io/ios/app/milling-cut-calculator-ii/id1552869246) All apps by Kent Johansson: https://appshunter.io/developer/1463036879 ## Related topics [carpenter triangle](https://appshunter.io/ios/topics/carpenter-triangle) · [right triangle calculator](https://appshunter.io/ios/topics/right-triangle-calculator) · [angle calculator triangle](https://appshunter.io/ios/topics/angle-calculator-triangle) · [right angle](https://appshunter.io/ios/topics/right-angle) · [the right angle](https://appshunter.io/ios/topics/the-right-angle) · [arbitrary triangle](https://appshunter.io/ios/topics/arbitrary-triangle) · [lil triangle](https://appshunter.io/ios/topics/lil-triangle) · [If the sides of a triangle are 4, 7, and 8, is it a right triangle?](https://appshunter.io/ios/topics/if-the-sides-of-a-triangle-are-4-7-and-8-is-it-a-right-triangle) · [right angle calculator](https://appshunter.io/ios/topics/right-angle-calculator) · [height calculator triangle](https://appshunter.io/ios/topics/height-calculator-triangle) · [carpenter square](https://appshunter.io/ios/topics/carpenter-square) · [angle calculator](https://appshunter.io/ios/topics/angle-calculator) · [arbitrary triangle pro](https://appshunter.io/ios/topics/arbitrary-triangle-pro) · [math solver triangle](https://appshunter.io/ios/topics/math-solver-triangle) · [carpenters square](https://appshunter.io/ios/topics/carpenters-square) · [triangle madness](https://appshunter.io/ios/topics/triangle-madness) · [angle calculator right](https://appshunter.io/ios/topics/angle-calculator-right) · [triangle solver for ios 7](https://appshunter.io/ios/topics/triangle-solver-for-ios-7) · [angle calculator degrees](https://appshunter.io/ios/topics/angle-calculator-degrees) · [isosceles triangle pro](https://appshunter.io/ios/topics/isosceles-triangle-pro) --- *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 2026-06-04.*