Stair Calculator
About Stair Calculator
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 : Use Stair Calculator from the Construction category.
- Check the inputs : Review the required values and any optional settings.
- Read the formula : Use the formula and notes below to understand how the result is produced.
Common Questions
What formula does the Stair Calculator use?
risers = total rise / target riser height. stringer length = ?(total rise^2 + total run^2).
Inputs
- Total rise inches
- Target riser inches
- Tread depth inches
Outputs
- Risers
- Actual riser height
- Treads
- Total run
- Stringer length
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.