StairPlan: Stair Calculator
Rise, Run, Stringer & Tread
About
Calculate staircase dimensions and check them against building codes. Supports various stair types and offers AR measurement, 3D previews, and exportable diagrams. Save unlimited projects offline.
What's New in StairPlan
1.7.0
October 15, 2026
V1.7.0 — Accuracy & iPhone Duo update. - Fixed: stair checks now follow the published codes. Landings are judged by vertical rise (IRC 12′-7″, IBC and OSHA 12 ft, Canada 3.7 m, Australia 18 risers), so ordinary 8–9 ft stairs are no longer flagged - Fixed: Canada's minimum tread is now 255 mm (NBC 2020); comfort checks apply only where a code defines one - Winder stairs are now straight flights plus a winder section, with your own turn angle in the 3D preview - L- and U-shaped stairs: riser count, pitch and floor opening now agree - Cut lists, DXF, SVG and PDF now match the stair on screen; stringer cost follows the boards you buy - AR measurement now records the vertical rise - New: iPhone Duo — two-pane layout on the inner display, controls in the side bar, a Saved list with its detail beside it, and a fraction keyboard that fits every pose - Consistent headers and a steadier Done bar on every tab; unit switching no longer drifts; clearer messages for out-of-range inputs; a crash fix in the multi-flight editor Still 100% offline. No tracking, no accounts, no servers.
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FAQ
What stair types does StairPlan calculate?
StairPlan calculates dimensions for straight, L-shaped, U-shaped, winder, spiral, helical, and deck stairs. It also handles multi-flight designs with landings and split-level stairs.
Does StairPlan check against building codes?
Yes, StairPlan checks your calculations against US IRC, IBC, OSHA, ADA, Canada NBC, UK Approved Doc K, and Australia NCC in real time. It also verifies handrail height, guard height, and landing depth compliance.
Can I measure with my phone using StairPlan?
Yes, StairPlan features AR camera measurement. With LiDAR-enabled devices, it can measure Total Rise with centimeter accuracy. It also provides 3D previews from multiple angles.
What can I export from StairPlan?
You can export scale PDF cut diagrams, a per-board cut list with angles, DXF and SVG files for CAD, a high-res PNG spec sheet, and a CSV cut list for spreadsheets.
How much does StairPlan cost?
StairPlan offers a 3-day free trial. Subscription options include $1.99/week, $4.99/month, $29.99/year, or a lifetime purchase of $79.99. Your saved projects remain accessible even if your subscription lapses.
Is StairPlan available on Android?
Based on the provided data, StairPlan is currently only supported on iPhone.
Does StairPlan have ads?
No, StairPlan is ad-free. The app is designed for 100% offline use, with no accounts, analytics, ads, or tracking.
How often is StairPlan updated?
The latest version, 1.7.0, was released on October 15, 2026, indicating active development and updates.
