# StairCalculators.net

> Free, code-aware stair calculators with printable build packets (spec sheet, cut list, framing-square setup, materials).
> All calculations run client-side. No signup, no paywall.

## What this site does
- 32 stair calculators covering straight, deck, L-shape, U-shape, quarter-turn, half-turn, switchback, winder, double-winder, spiral, curved, concrete, floating, steel, ship-ladder, ADA stair and ramp, plus component tools (stringer, tread, riser, baluster spacing, handrail, newel, nosing, headroom, landing size, stair opening, skirt board, lighting, timber/board-feet, load capacity, rise-over-run).
- Live compliance checks against IRC (2018/2021/2024), IBC, UK Building Regs Part K, Eurocode, and Australian NCC, with clause citations.
- One-click "build packet" PDF: spec sheet, cut list, framing-square setup, and materials list, with a shareable link that pre-fills the calculator.

## Key formulas
- steps = round(total rise / target riser)
- riser = total rise / steps
- tread = total run / (steps - 1)
- stringer = sqrt(total rise^2 + total run^2)
- angle = atan(total rise / total run)
- Blondel comfort: 2*riser + tread ~= 24-25 in

## Important caveat
Code threshold values are being finalized against primary published sources.
Results are engineering estimates; users must verify against the building code
edition enforced by their local authority having jurisdiction before construction.

## Pages
- /calculators/straight-stair/  Straight stair calculator (live)
- /methodology/                 All formulas and code sources
- /faq/                         Common stair questions
- /guides/                      Stair building guides
- Contact: contactus@staircalculators.net