Stair Calculator
Estimate risers, treads, and total run.
Risers
15
Actual riser height
7.2 in
Treads
14
Total run
140 in
Stringer length
176.82 in
Formula
risers = total rise / target riser height. stringer length = sqrt(total rise^2 + total run^2).
Disclaimer
- Stair code and headroom requirements vary by local jurisdiction.
Estimate risers, treads, and total run.
How to Use
Estimate risers, treads, and total run. Fill in Total rise inches, Target riser inches, and Tread depth inches, then review the calculated Risers, Actual riser height, Treads, Total run, and Stringer length.
- Open the calculator : Start with Stair Calculator.
- Enter values : Fill in the required inputs and any optional settings.
- Review the result : Read the output and use the about page for more detail if needed.
Common Questions
What formula does the Stair Calculator use?
risers = total rise / target riser height. stringer length = ?(total rise^2 + total run^2).