StairPlan: Stair Calculator

About this app

What does StairPlan do? Calculates stringer length, riser height, tread depth, and pitch angle for any staircase. Enter total rise and tread depth, get instant results plus an IRC R311.7 compliance check. Is my data private? 100% offline. Nothing leaves your iPhone. No accounts, no analytics, no ads, no tracking. How do I get started? 1. Enter total rise (floor to floor height) 2. Enter desired tread depth (default 10 inches) 3. Read off riser count, riser height, stringer length, and pitch angle What can I do with it? - Real-time stair calculations with imperial fractions or metric - IRC R311.7 compliance warnings (riser height, tread depth, max flight, sum rule) - Save unlimited stair projects with custom names and notes - Export scale PDF cut diagrams to print and tape to your wall - Side view visualization updates as you type - Reference section with IRC code, formulas, and cutting instructions What units does it support? Imperial (feet and inches with fractions to 1/16) and Metric (millimeters and centimeters). Will the PDF print at actual size? Yes. PDF output uses 1 inch = 72 points so the cut diagram prints at true scale on letter or A4 paper. Tape it to your stringer board and trace. Who is this for? Carpenters, finish carpenters, deck builders, renovation contractors, and DIY homeowners building porch steps, deck stairs, or interior staircases. How much does it cost? 3-day free trial, then $1.99/week, $4.99/month, $29.99/year, or $79.99 lifetime. Terms of Use: https://taxlite.net/stair_stringer_calc/terms.html Privacy Policy: https://taxlite.net/stair_stringer_calc/privacy.html

V1.5 — multi-flight stairs, rough opening sizing, and cut-list CSV export. MULTI-FLIGHT STAIRS - Design stairs with 3 or more flights and landings, not just a single L or U turn - Give each flight its own riser height and tread depth, with landings turning left or right at any angle - Side view, 3D preview, PDF, DXF, and SVG all draw every flight and landing to scale ROUGH OPENING SIZING - New Rough Opening card calculates the floor opening length your stair needs for code-compliant headroom - Shows exactly which riser to cut the opening back to CUT LIST CSV EXPORT - Export your per-board cut list as a standalone CSV — open it in Numbers, Excel, or Sheets on the job site - Still ships alongside the PDF cut list page Still 100% offline. No tracking, no accounts, no servers. Camera used only when you tap Measure.

Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.

1. First observed Aug 24, 2026 · 4:12 AM Free