Built for layout at the jobsite
- Total rise to exact riser and tread layout.
- Stringer length, total run, cut angle, and bottom-riser adjustment.
- Labeled stringer diagram with IRC 2021 and IBC checks.
- US-customary and metric units, with fractions to 1/32 inch.
- No account, no ads, no analytics, and no backend.
Free and Pro
Free
Calculator, code check, diagram, reference cards, built-in presets, and the last five saved layouts.
Pro, one-time $6.99
Unlimited saves, custom presets, PDF cut sheets, text sharing, math breakdown, elevation preview, and flight planning.