Every calculator includes a live SVG diagram, multi-jurisdiction code compliance (IRC, IBC, UK, AU, Eurocode), and printable output. Free, no signup.
Rise, run, stringer, angle, mount type.
Grade-to-deck, stringer spacing, landing trigger.
Quarter-turn with landing solver.
Switchback, stairwell footprint, turn headroom.
Pie-tread geometry, per-tread code check.
Arc treads, center column, handrail length.
Pour volume, formwork, rebar estimate.
Slope, angle, percent grade, 1-in-N.
90° turn with landing (L-shaped).
180° turn with half-landing (U-shaped).
180° parallel flights, commercial & exterior.
180° turn on pie-shaped winder treads.
Tread depth, count, and code minimum.
Board size, throat, count and spacing.
Cut length, throat, board recommendation.
Count & gap under the 4″ sphere rule.
Clearance check & required floor opening.
Overhang, effective tread, code range.
Minimum landing depth & door clearance.
Rail length, returns, height check.
Floor opening length & width for headroom.
Post count & spacing along a rail run.
Rake length & plumb/level cut angles.
Stringer steel weight estimate.
1:12 slope, run length, landings.
504/505 riser, tread & handrail checks.
Steep ladder-stair geometry (50–75°).
Cantilever tread planning (engineered).
Arc-tread geometry along a radius.
LED strip length & step-light count.
Board feet of lumber for components.
Code design live load & total over area.
More calculators are in development. Looking for something specific? Let us know.