Right Angle is a calculator built for carpenters, builders, surveyors,
machinists, and engineers — anyone who needs to solve a triangle, a
trapezoid, or a circle without reaching for a notepad and the law of
sines.
Enter any valid combination of sides and angles and Right Angle solves
the rest, including perimeter and area. The right triangle calculator
is included for free; every other shape unlocks with a one-time Pro
purchase or subscription.
SHAPES
• Right triangle (free)
• Oblique triangle
• Isosceles, right, and general trapezoids
• Full circle — enter radius, diameter, or circumference
• Segment of a circle
ANGLE FORMATS
• Decimal degrees
• Radians
• Degrees / minutes / seconds (DMS)
• Percent grade
• Pitch (x-over-12)
LENGTH FORMATS
• Decimal — the original, unitless entry. Best for metric.
• Feet, inches & fractions — type values like 2' 5 1/2".
• Inches & fractions — type values like 40 1/2".
Pick a fraction precision from 1/2 down to 1/64 inch. Inputs and outputs
both use the format you choose, and you can switch any time from Settings.
DESIGNED FOR THE JOB SITE
• A custom on-screen keyboard puts the symbols you need — feet, inches,
fraction slash, degree, prime, double-prime — one tap away.
• Helpful errors when an input combination can't be solved, instead of
silent failures.
• Available in English and Spanish — iOS picks the language to match
your device.
• Full VoiceOver support across the keyboard, input fields, shape
diagrams, and results. Animations respect the Reduce Motion setting.
EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy policy: http://rightangleapp.com/privacy.html
Ever since I downloaded this app it has made my job easier. It is excellent and very helpful and would recommend it to students and drafters.
Lose Your purchase
Copper Genius
If you do this update, you will lose your previously purchased unlocked app. And you now need to spend $4.99 to unlock the features that you paid for previously I tried to restore my purchase and it did not work. Fortunately, I did not update the app on my other phone so I still have a version that will work. And I am using it right now for work and messing around with. It is not something I wanted to do right now. I’m just not about the money, I’d love to pay the extra five bucks to help keep this app going, but it’s the principle and the timing that stinks
Developer Response
If you try updating to >= 5.4.0 this should be fixed.
Most recent update ruined this app
Chandler Salmans
This app was 5 stars for the years I’ve used it but when I opened it yesterday and seen the option for feet and inches on the calculator was removed I was disappointed and now I have to convert all my measurements to decimals and back to get accurate measurements, I might as well just use the formula on my pipe trades calculator.
Help I'm crashing
Superseadude
The new update makes this program crash after it opens. looking for the next update. I deleted and re-installed no difference .
Right Angle has a whole new design, and it now keeps a history of your calculations.
NEW DESIGN
• A cleaner look on every screen, and a new app icon
• Light and dark mode: follow your device, or choose one in Settings
• One calculator for every shape. Switch shapes with the button at the bottom left
• A new number pad in the style of the iOS keyboard, with a Done button to put it away
• Feel a gentle tap on every key, and feel whether your shape solved
• Share a solved shape's values to Messages, Notes, or anywhere else
• Layouts made for iPhone, iPad, and iPhone Duo
CALCULATION HISTORY
• Every shape you solve is saved on your device
• Open History from the menu or the calculator, tap a calculation to load it, change a value, and solve again
• Delete one calculation, clear a shape's history, or clear it all
IMPROVEMENTS AND FIXES
• After a solve, you can change one of your values and solve again
• Lengths you type keep their exact value instead of being rounded to your fraction precision
• Changing the angle or length format converts the values already on screen
• In Percent Grade and Over 12, angles of 90° or more show in degrees
• Degrees, minutes, and seconds no longer show 60 seconds; they carry over, as in 60° 0' 0"
• Trapezoids catch bottom angles that would make the legs parallel
• An error that replaces another stays up long enough to read
• Cancelling a purchase or a tip no longer shows the wrong message
• The tip prompt appears at most once per launch
• Better VoiceOver labels, contrast, and large text support
• Usage analytics no longer include the values you enter
Version 7.0.0
The developer, Jerry Mayers, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
Purchases
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
Identifiers
Usage Data
Diagnostics
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
Seller
Jerry Mayers
Size
8.1 MB
Category
Productivity
Compatibility
Requires iOS 26.0 or later.
iPhone Requires iOS 26.0 or later.
iPad Requires iPadOS 26.0 or later.
Mac Requires macOS 26.0 or later and a Mac with Apple M1 chip or later.
