# LFA Stairs Pro — Stair Calculator & 3D Plans

> Stair Calculator & 3D Plans (iPhone/iPad app by Lorenzo Francisco Almonte.)

- Source: https://appshunter.io/ios/app/lfa-stairs-pro/id6814916882 (this page in markdown: same URL + `.md`)
- Developer: [Lorenzo Francisco Almonte](https://appshunter.io/developer/6782756160)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 20 MB
- Released: 2026-10-01
- Data updated: 2026-10-02
- User reviews in markdown: https://appshunter.io/ios/app/lfa-stairs-pro/id6814916882/reviews.md

## What is LFA Stairs Pro?

LFA Stairs is the professional carpentry and design tool for laying out staircases on the jobsite. Enter the total rise and width, and you immediately get the riser and tread layout, dimensioned CAD blueprints, an interactive 3D model, and a complete cut list with every piece measured.

ELEVEN STAIR TYPES
• Straight
• L-shape left and right
• Winder L-shape
• 180° U-shape
• Winder U-shape
• Spiral / Helical
• Floating Cantilever
• Curved
• Mono-Stringer
• Open Riser

WHAT YOU GET
• Riser and tread layout with exact floor arrival height
• 2D CAD plan: plan view, front and side elevations, fully dimensioned
• 3D stair that you can rotate and zoom with your fingers
• Detail card for each piece: cut length, cross section, bevel angles, bearing points, and fasteners
• Complete cut list ready for the lumberyard
• Stringers, risers, treads, landings, railing, and skirtboards

RAILINGS
Wood balusters, wrought iron, glass panels, stainless steel cable, horizontal slats, and industrial pipe. Baluster spacing is computed automatically and checked against the clear-opening limit.

BUILDING CODES
Calculations follow the International Residential Code (IRC): riser height (R311.7.5.1), tread depth (R311.7.5.2), walkline in spirals (R311.7.10.1), 4-inch sphere rule for balusters (R312.1.3), landings (R311.7.6), and handrail height (R311.7.8.1). The app alerts you when any dimension falls outside IRC limits.

EXPORT AND SHARE
• PDF report with full technical specifications and jobsite plans
• 3D and CAD exports in OBJ, DAE, and DXF

IN YOUR LANGUAGE AND UNITS
English and Spanish. Inches and feet, or metric.

WORKS OFFLINE
Calculation, design, and 3D viewer do not require an internet connection. Your projects and dimensions are saved locally on your device.

PREMIUM SUBSCRIPTION
PDF and CAD exports are included in the optional subscription. All Results tabs can be viewed without a subscription.
• Monthly and annual plans with prices shown in the app for your region.
• A 7-day free trial may be available to eligible new subscribers.
Subscription automatically renews through your Apple ID unless canceled in iOS Settings at least 24 hours before the end of the current period.

Made by LFA Interiors and Construction LLC.

Privacy Policy: https://lfa-legal.surge.sh/privacy.html

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Premium Monthly | $2.99 | per month |
| Premium Annual | $29.99 | per year |



## Version history (last 1 release)

### 2.0.4 — 2026-10-01

No release notes.

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## More apps by Lorenzo Francisco Almonte

- [Elite Real Estate Analyzer](https://appshunter.io/ios/app/elite-real-estate-analyzer/id6782756158)
- [LFA Construction Calculator](https://appshunter.io/ios/app/lfa-construction-calculator/id6786470879)

All apps by Lorenzo Francisco Almonte: https://appshunter.io/developer/6782756160

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*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 2026-10-02.*