Stair Calculator
Risers, runs, and headroom from total rise.
Example
You enter
- Total rise (in) 108
- Preferred riser height (in) 7.5
You get
- Risers 14
- Treads 13
- Riser height 7.714 in
- Total run 130 in
Details, formula, and sources
Riser height and tread depth from total rise / number of risers; standard 7″ max riser, 11″ min tread per IRC 2021 §R311.7.
IRC 2021 (International Residential Code). §R311.7.
Free read-only access at codes.iccsafe.org.
Estimate. AHJ and licensed structural engineer govern.
Field names used by the API: total_rise_in, preferred_riser_height_in, risers, treads, riser_height_in, total_run_in
- Standard riser max 7-3/4 in residential per IRC §R311.7.5.1IRC 2021
- Standard tread min 10 in residential per IRC §R311.7.5.2IRC 2021