# Stair Stringer Calculator Pro — Rise & Run, Cut List & IRC

> Rise & Run, Cut List & IRC (iPhone/iPad app by 京昌 陈.)

- Source: https://appshunter.io/ios/app/stair-stringer-calculator-pro/id6817401495 (this page in markdown: same URL + `.md`)
- Developer: [京昌 陈](https://appshunter.io/developer/6783155021)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: American English, European Spanish
- Released: 2026-10-01
- Data updated: 2026-10-04
- User reviews in markdown: https://appshunter.io/ios/app/stair-stringer-calculator-pro/id6817401495/reviews.md

## What is Stair Stringer Calculator Pro?

Stair Stringer Calculator lays out a straight flight of stairs from three measurements and tells you how to cut the stringers — in carpenter's fractions, not decimals.

Enter the total rise, the tallest riser you'll accept and your tread depth. You get the riser count and exact riser height, the tread count, total run, stringer length and stair angle, plus a to-scale drawing of the cut stringer.

CUT IT RIGHT
• Riser height is rounded so it never exceeds your maximum
• The first riser cut is dropped by your tread thickness, so every finished step is equal
• Framing square settings and the step-off distance along the board edge
• Notch depth and the solid wood left under the notches (throat) for a 2x10, a 2x12 or any board depth
• How many stringers to cut for your stair width, and their spacing
• Type measurements the way you read a tape: 108 1/2, 9' 0-1/2", 7 3/4

CHECK IT BEFORE YOU CUT
Every layout is checked, and the result shows what passed, not only what failed:
• IRC R311.7: maximum riser 7-3/4", minimum tread 10", maximum rise of one flight 151", minimum width 36", nosing and handrail requirements
• AWC DCA 6 deck-stair stringer limits: at least 5" of throat, a 6'-0" maximum span for cut stringers, stringers no more than 18" on center
• The stride rule 2R + T for a comfortable stair (24–25 in; 590–650 mm per DIN 18065 when you work in millimeters)

FULL CUT LIST AND PDF
• Height, run and board-edge mark for every step
• A PDF layout sheet with the drawing, cut list and code check for your crew or inspector
• Unlimited history: reopen any saved layout with its drawing and checks

INCHES OR MILLIMETERS
Switch units any time. Inch results read like a tape measure, to the nearest 1/16".

WORKS THE WAY YOU DO
• Everything runs on your device — no account, no sign-in
• Works fully offline on the job site
• Collects no data and shows no ads
• English and Spanish interface

SIMPLE PRICING
The calculation, drawing and code check are free, and the free version keeps your 10 most recent layouts. One in-app purchase unlocks the full cut list, PDF export and unlimited history. No subscription.

The formula sources are listed in the app: IRC 2021 Section R311.7, AWC DCA 6-15 Figures 28–29, and the stride rule. This app is a layout aid; always verify against the building code in force at your job site.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Stair Stringer Pro | $9.99 | one-time |



## Version history (last 1 release)

### 1.0 — 2026-10-01

No release notes.

## Apps similar to Stair Stringer Calculator Pro

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [StairPlan: Stair Calculator](https://appshunter.io/ios/app/stairplan-stair-calculator/id6767059580) | — | Free | Utilities |
| [BuildCalc: Material & Estimate](https://appshunter.io/ios/app/buildcalc-material-and-estimate/id6764519874) | — | Free | Utilities |
| [YBL 410](https://appshunter.io/ios/app/ybl-410/id6504950240) | — | Free | Utilities |
| [Stair Calculator: Run & Rise](https://appshunter.io/ios/app/stair-calculator-run-and-rise/id6502868383) | 4.2 (44) | Free | Utilities |
| [Unravel: Steel Calculator](https://appshunter.io/ios/app/unravel-steel-calculator/id468671830) | 4.9 (10) | Free | Utilities |
| [SHOWin3D \| AR & VR viewer PRO](https://appshunter.io/ios/app/showin3d-ar-and-vr-viewer-pro/id1166103410) | 3.5 (2) | Free | Utilities |

## More apps by 京昌 陈

- [Site Report: Punch List](https://appshunter.io/ios/app/site-report-punch-list/id6783295578)
- [Home Inspection Report](https://appshunter.io/ios/app/home-inspection-report/id6791948495)
- [Property Walkthrough Report](https://appshunter.io/ios/app/property-walkthrough-report/id6802339095)
- [Jobsite Safety Inspection Log](https://appshunter.io/ios/app/jobsite-safety-inspection-log/id6802364076)

All apps by 京昌 陈: https://appshunter.io/developer/6783155021

## Related topics

[cmm stair rail calculator](https://appshunter.io/ios/topics/cmm-stair-rail-calculator) · [stair stringer calculator](https://appshunter.io/ios/topics/stair-stringer-calculator) · [stair calculator](https://appshunter.io/ios/topics/stair-calculator) · [stair calculator pro](https://appshunter.io/ios/topics/stair-calculator-pro)

---

*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 2026-10-04.*