The Professional Right-Angle Calculator
Handles the units you actually use — fractional inches, feet & inches, decimal inches, and millimeters — with instant diagram preview and high‑precision results.
Enter dimensions exactly as you use them: 5ft 10-1/2in, 70-1/2", or decimal inches. Sub-display instantly converts to your chosen second unit.
Mix and match unit displays freely in any combination. Work in the system you prefer — ft/in or metric.
Every digit you type is instantly reflected in the diagram. Input errors are immediately visible — intuitive and efficient.
From small framing components to wide-area surveying — calculate angles to mountain peaks or distant tall structures.
Sides to 4 decimal places. Angles to 6 decimal places (4 in DMS). Tap any value for a detailed precision readout.
Flip the diagram between right-rising and left-rising with one tap.
Save and print calculation results with diagrams as PDF. Easy to share on-site or by email.
Switch between Light and Dark to suit your environment. Both modes are fully refined.
All calculations run completely offline. Data is processed only on your device — no internet required.
Built for professional precision. Every unit, every decimal — right where you need it.
Carpenters, framers, contractors, and construction professionals working with imperial measurements.
Anyone who needs to calculate angles, slopes, or diagonal lengths on the job site.
DIY enthusiasts and model makers who need precise angle calculations.
Those who frequently convert between fractional inches, feet, and metric.
Please Note
Every effort has been made to ensure calculation accuracy. However, minor rounding errors may occur. Please verify all results before use in construction or professional work.
As we continually improve the app, if there is any discrepancy between this description and the actual behavior, the app's behavior takes precedence.
Terms of Use (EULA): Apple Standard EULA
Have a question or feedback? We'd love to hear from you.
