How it works
A walkthrough, end to end.
- 1
Enter total rise (vertical) and total run (horizontal).
- 2
Optionally fix the number of risers.
- 3
See riser height, tread depth, stringer length, and rise/run angle.
Reference
Stair geometry
risers = round(total rise / 7"). riser = totalRise / risers. tread = totalRun / (risers − 1). stringer = √(rise² + run²).
Use cases
What you can do with this.
Deck stairs
Plan code-compliant deck steps.
Basement stairs
Standard residential interior stairs.
Landing planning
Verify number of risers fits the opening.
Renovation
Match an existing stair's pitch.
Code check
Compare against IRC max 7¾" / min 10" rules.
FAQ
Frequently asked.
IRC: max riser 7¾", min tread 10". Many jurisdictions vary slightly.
Horizontal distance from nose to nose. Doesn't include landings.
No. All math runs in your browser.
Calculator gives geometry only; tread/riser materials are separate.