# StairPlan: Stair Calculator — Rise, Run, Stringer & Tread

> Rise, Run, Stringer & Tread (iPhone/iPad app by ZHENGQIAO JIANG.)

- Source: https://appshunter.io/ios/app/stairplan-stair-calculator/id6767059580 (this page in markdown: same URL + `.md`)
- Developer: [ZHENGQIAO JIANG](https://appshunter.io/developer/1892168889)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 2 MB
- Languages: American English, European Spanish, Korean, German (Germany), French (France), Japanese
- Released: 2026-05-07
- Data updated: 2026-08-25
- User reviews in markdown: https://appshunter.io/ios/app/stairplan-stair-calculator/id6767059580/reviews.md

## What is StairPlan?

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

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Weekly | $1.99 | per 7 days |
| Monthly | $4.99 | per month |
| Yearly | $29.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Lifetime | $79.99 | one-time |



## Version history (last 5 releases)

### 1.5.0 — 2026-08-19

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.

### 1.4.0 — 2026-08-06

V1.4 — real L/U segmented drawings, landing & width checks, cut lists, and Smart Suggest.

 TRUE L/U SHAPED STAIR DRAWINGS
 - Side view, PDF, DXF, and SVG now draw each flight of an L or U shaped stair separately with a landing break — no more one flight forced straight
 - Framing Square layout table now covers both flights of L/U stairs

 LANDING & WIDTH COMPLIANCE
 - Landing depth check for L/U stairs (IRC/IBC/NBC minimums)
 - Minimum stair width check now has real IRC, IBC, and NBC thresholds
 - Winder narrow-end tread check per IRC R311.7.5.2.1 (6-inch minimum)

 CUT LIST EXPORT
 - Per-board cut list with plumb/level cut angles, notch depth and position, and standard stock length — a new page in the PDF export

 SMART SUGGEST
 - One-tap local-math suggestions for riser/tread combinations that meet your chosen code, no network required

 MORE
 - Deck mode now supports L-shaped (wraparound) stairs
 - Saved projects stay browsable read-only without a subscription
 - 3D preview: 6 camera angles (front, left, right, back, iso, top)

 Still 100% offline. No tracking, no accounts, no servers. Camera used only when you tap Measure.

### 1.3.0 — 2026-07-12

V1.3 — commercial codes, handrail checks, and framing-square layout.

 COMMERCIAL, INDUSTRIAL & ACCESSIBLE CODES
 - New code sets beyond residential: IBC (commercial), OSHA 1910.25 (industrial), and ADA
 - IBC 7-inch max riser and 11-inch tread; OSHA 9-1/2-inch riser with a 30-50 degree pitch window
 - ADA nosing projection and 1/2-inch leading-edge radius limits
 - Pick the code that fits the job right in Settings

 HANDRAIL & GUARD CHECKS
 - Handrail height 34-38 inches and guard height (36 inches residential, 42 inches commercial)
 - Graspability: Type I round (1-1/4 to 2 inch) and Type II perimeter (4 to 6-1/4 inch)

 FRAMING SQUARE LAYOUT
 - Framing-square body (rise) and tongue (run) settings for your exact stair
 - Per-step diagonal, total board layout, bottom-riser drop, and a full step-off table

 TREAD THICKNESS & NOSING
 - Set tread thickness (drives the bottom-riser drop) and nosing projection
 - Nosing checks per code, reflected live in the 3D preview

 IMAGE EXPORT
 - Export a high-resolution PNG of the full stair spec sheet to share or save to Photos

 Still 100% offline. No tracking, no accounts, no servers. Camera used only when you tap Measure.

### 1.2.0 — 2026-06-21

V1.2 — spiral stairs, deck stairs, and pro structural checks.

 SPIRAL + HELICAL STAIRS
 - New spiral stair type with center-pole radius, outer radius, and turn angle
 - Walkline tread, clear width, headroom-per-turn, and outer helix (handrail) length
 - IRC R311.7.10.1 checks: 6-3/4-inch walkline tread, 9-1/2-inch riser, 6-foot-6 headroom
 - Top-down plan fan view plus a helical 3D model

 DECK STAIR MODE
 - Stringer count from stair width and on-center spacing
 - Wood (≤16 in) and composite (≤12 in) spacing advisories
 - Kicker board + landing pad added to the Bill of Materials

 RAILING + BALUSTER SPACING
 - Equal-spacing baluster calculator per IRC R312.1.3
 - 4-inch sphere on level guards, 4-3/8-inch on the stair rake

 STRUCTURAL THROAT + SPAN
 - Throat depth from 2x10 / 2x12 / 2x14 board width with a minimum-throat warning
 - 6-foot cut-stringer span check (AWC/APA practice)
 - Open (cut) vs closed (housed) stringer, each drawn its own way

 CONSTRAINT SOLVER
 - Solve for fixed rise, fixed run, or both — the app derives the rest

 MULTI-VIEW 3D
 - Switch the 3D preview between 3D, Front, Side, and Top (orthographic) views

 Still 100% offline. No tracking, no accounts, no servers. Camera used only when you tap Measure.

### 1.1.0 — 2026-05-17

Big V1.1 update — built around how real carpenters work.

 NEW STAIR TYPES
 - L-shaped, U-shaped, and winder stairs alongside straight
 - Per-flight stringer + run breakdown
 - IRC R311.7.5.2.1 walkline tread check at 12-inch radius

 GLOBAL CODE COMPLIANCE
 - Switch between US IRC, Canada NBC (OBC mirror), UK Approved Doc K, and Australia NCC 2022
 - Region-specific thresholds for max riser, tread, headroom, pitch, and landing

 HEADROOM + FLOOR FINISH COMPENSATION
 - Optional ceiling height input flags low headroom
 - Top / bottom finish thickness inputs ensure equal risers AFTER flooring

 AR MEASURE (LiDAR aware)
 - Two-tap distance measurement straight into Total Rise
 - LiDAR-equipped iPhones get +/-1 cm accuracy

 3D PREVIEW
 - SceneKit isometric view alongside the 2D side elevation
 - Drag to orbit, pinch to zoom

 EXPORTS + MATERIALS
 - Per-project Bill of Materials added as PDF page 2 (lumber feet, treads, risers, total cost)
 - DXF (CAD) and SVG (vector) export alongside PDF
 - 1:N integer scale picker auto-snaps to architect / carpenter scales

 PROJECT DETAILS
 - Site notes + reference photos via PHPicker (no permission needed)
 - Stair-type-aware summary card

 POLISH
 - Custom fraction precision (1/2 to 1/64)
 - Multi-flight landing suggestions when over the regional flight cap
 - Animated How-to-Cut walkthrough in Reference

 Still 100% offline. No tracking, no accounts, no servers. Camera used only when you tap Measure.

## Apps similar to StairPlan

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Stair Calculator .](https://appshunter.io/ios/app/stair-calculator/id6760628453) | — | Free | Utilities |
| [Stairs 3D: Framing Calculator](https://appshunter.io/ios/app/stairs-3d-framing-calculator/id6760602710) | — | Free | Utilities |
| [BauKalk - Construction Calc](https://appshunter.io/ios/app/baukalk-construction-calc/id6761668004) | — | Free | Utilities |
| [DAW Converter](https://appshunter.io/ios/app/daw-converter/id1504020213) | — | Free | Utilities |
| [Evongo](https://appshunter.io/ios/app/evongo/id6504404721) | — | Free | Utilities |
| [Stair Calculator Pro](https://appshunter.io/ios/app/stair-calculator-pro/id6757703166) | 4.0 (4) | Free | Utilities |

## More apps by ZHENGQIAO JIANG

- [RoundClock: HIIT & Tabata](https://appshunter.io/ios/app/roundclock-hiit-and-tabata/id6763663534)
- [Days Off — Holiday Planner](https://appshunter.io/ios/app/days-off-holiday-planner/id6763955034)
- [SimpleTranslate Pro](https://appshunter.io/ios/app/simpletranslate-pro/id6764520918)
- [Photo Cleaner: Smart Swipe](https://appshunter.io/ios/app/photo-cleaner-smart-swipe/id6764684027)
- [QR Barcode Scanner Reader](https://appshunter.io/ios/app/qr-barcode-scanner-reader/id6764745638)
- [MemePack: Chinese Stickers](https://appshunter.io/ios/app/memepack-chinese-stickers/id6764804165)

All apps by ZHENGQIAO JIANG: https://appshunter.io/developer/1892168889

## Related topics

[app builder free stair](https://appshunter.io/ios/topics/app-builder-free-stair) · [free stair calculator](https://appshunter.io/ios/topics/free-stair-calculator) · [stair calculator](https://appshunter.io/ios/topics/stair-calculator) · [stairs calculator](https://appshunter.io/ios/topics/stairs-calculator) · [staircase calculator](https://appshunter.io/ios/topics/staircase-calculator)

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-25.*