Stair Stringer Calculator is a tools app developed by k4y apps.
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Stair Stringer Calculator has been downloaded 0 times. In the last 30 days, the app was downloaded 0 times.
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App Information
Stair Stringer Calculator is FREE to download. The APK download size is 6.96 MB. The latest version available is 1.0.0. The last update was on August 16, 2026.
Technical Requirements
The app has a content rating of Everyone. The app has been available on Google Play 2 weeks ago.
Description
Stair Stringer Calculator lays out a full stair flight from total rise, checks it against code, and adds common and hip/valley rafter length for the roof.
Use this stair stringer calculator to turn a floor-to-floor rise into riser height, tread count, stringer length, and framing-square step-off marks - and this roof pitch calculator to get rafter length and cut angles - with the formulas shown on screen so you can check the math.
STAIRS - Enter total rise and a target riser height; the app finds the riser count that lands closest to your target - Build from tread depth or from a fixed total run - See riser height, tread count, tread depth, total run, and stringer length, in feet-and-inches and as a fraction down to 1/32 inch - Get framing-square step-off marks: rise mark, run mark, step-off count, and the bottom-drop correction so the first step is not taller than the rest - Choose flush-top or open box-top stringer construction - Check riser height, tread depth, and riser-height uniformity against IRC 2021 R311.7 (residential) or IBC 2021 1011.5 (commercial), plus a headroom check against the 6'-8" minimum - See the 2R+T and R+T comfort rules of thumb, kept separate from the code checks since they are advisory only - Save a layout to the Layouts tab; the first saved layout needs no ad
ROOF - Enter roof pitch as rise-per-12, degrees, or percent slope; editing any one updates the other two - Enter run, ridge thickness, and overhang to get common rafter line length, total length, rise, unit length, and plumb/level cut angles - Get hip or valley rafter length and cut angles for the same run and pitch - Log a calculation to a running history list; logging needs no ad, and the saved history unlocks with a short rewarded ad
LAYOUTS - Save the current stair layout or roof calculation by name - Reload a saved layout back onto its tab - Delete any saved layout - The first saved layout needs no ad; saving more unlocks with a short rewarded ad
CODE CHECKS, PLAINLY LABELED Code compliance checks and the comfort rules of thumb are shown as separate, differently labeled results so a code failure is never confused with a comfort suggestion. Always confirm against the specific code edition actually adopted by your local jurisdiction before relying on these for a real permit.
BUILT FOR THE JOB SITE - Fast entry with minimal taps - Works offline on site - No account required - Your saved layouts and history stay on your device
This app is ad-supported. Stair and roof calculations are always available; saving beyond the first layout or viewing your roof history unlocks with a short rewarded ad.
Recent changes: First release.
Enter a floor-to-floor rise and the app returns riser height, tread count, stringer length, and the marks to scribe with a framing square.
A second tab does common and hip or valley rafter length.
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