Ignotix — Stair Stringer Geometry Studio

Enter a floor-to-floor rise and user-selected geometry references to calculate equal risers, tread run, stringer length, throat geometry and a reference stringer count. The framing-square layout and cut templates are dimensional references only; this reference pass does not determine project suitability, member capacity or installation requirements.

01 Rise & width

Total rise — floor to floor

Riser sizing

Target riser reference

Stair width (in)

Stringer spacing (in o.c.)

Enter rise like 9' or 108". Set riser height fixes the unit rise directly; if it does not divide the floor-to-floor evenly, the remainder is flagged.

02 User reference values

Maximum riser reference (in)

Minimum tread reference (in)

These are user-selected geometry flags only. They are not sourced, maintained or represented as project requirements.

03 Tread, nosing & bullnose

Tread depth / unit run (in) — user-set

Tread thickness (in)

Nosing / overhang (in)

Bullnose radius (in)

Nosing, bullnose and tread thickness are user-entered geometry. Tread thickness sets the bottom-stringer drop; no installation requirement is determined here.

04 Stringer stock

Stock

Risers

Min throat (in)

Minimum throat is a user-defined reference flag. No member-strength or material-capacity analysis is performed.

05 Pricing & waste

Waste (%)

06 Landing / platform (front view area)

Top landing

Landing width (in)

Landing depth / projection (in)

Defines the platform drawn at the top of the Front view. Area = width × depth; decking is added to the take-off as ft². Leave unchecked to omit.

Stringer elevation

Total rise · floor-to-floor

Tread run · per step

1:1 cut templates

07 Solved stair

08 Framing-square layout — Pro

★

Framing-square layout — Pro

Step-by-step square settings (rise on tongue, run on blade), bottom drop, plumb & level cut lengths, throat line, and full cut list.

Reference geometry only. Outputs are generated from user-provided dimensions and user-selected reference values. Member capacity, connections, landings, openings, overhead clearances, guards, handrails, field conditions and installation details are not evaluated. Independently review all dimensions and project requirements before cutting or building.