Stair calculator
Total rise → riser count, treads, total run, stringer length, and angle — flagged against the common residential reference.
How to use
- Enter the floor-to-floor rise and tread depth (mm or inches).
- Calculate.
- Read risers, run, stringer, angle, and the reference check.
What it supports
Riser count is chosen so each riser stays ≤ 7¾ in, targeting ~7 in; treads = risers − 1 (the top is the landing). Rise 100–10,000 mm. Reference check only — local building codes differ and this is not a compliance verdict.