Rise and Run Angle calculator.
Calculate the geometric angle and diagonal from a rise and horizontal run.
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 run is horizontal, not the diagonal. The result is the angle above horizontal, independent of construction suitability.
A worked example
Illustrative inputs only. Product properties and design dimensions are not recommendations for your project.
- Vertical rise
- 3 m
- Horizontal run
- 4 m
Geometric angle: 36.87 °
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.
Enter an existing geometric configuration; the output does not select a stair pitch or roof design.
Method: dimensional arithmetic and user-supplied specifications. Software checks: 2026-10-04. Calculation and review policy.