Right Triangle Solver.
Solve a right triangle from two independent supplied lengths or a supplied angle and length.
Your inputs
Schematic only. Use your measured dimensions and the stated angle convention.
Use measurements from your plan and properties from your chosen product. Any prefilled values are illustrative.
A clear estimate starts here.
Enter your dimensions and product details to see the quantity and purchase breakdown.
Formula and assumptions
How this calculation works.
The solver uses the Pythagorean theorem and elementary trigonometry. The diagonal must exceed the supplied leg. It calculates geometry and does not choose a roof slope, stair layout or structural member.
A worked example
Illustrative inputs only. Product properties and design dimensions are not recommendations for your project.
- Known measurements
- Rise and run
- Vertical rise
- 3 m
- Horizontal run
- 4 m
Diagonal / hypotenuse: 5 m
Before you purchase
Use dimensions from your plan and properties from your chosen product. Any design spacing, section or fixing pattern must already be specified.
Method: dimensional arithmetic and user-supplied specifications. Software checks: 2026-10-05. Calculation and review policy.