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 .
• Now available in Spanish — iOS picks the language to match your device.
• Three new trapezoid solvers: isosceles, right, and general. Enter the sides and angles you know and the rest fills in, along with area and perimeter.
• A new full-circle solver — type any one of radius, diameter, or circumference and the other two plus the area come back.
• On smaller screens, the input you're editing now scrolls up above the keyboard so the instructions and any error stay visible.
• The keyboard fades in smoothly when Reduce Motion is enabled.
Version 6.0.0
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 Not Linked to You
The following data may be collected but it is not linked to your identity:
Identifiers
Usage Data
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
2.4 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.
