Stair Stringer Geometry

Stringer slope length from the same rise/run geometry as STAIRS-01. Not a birdsmouth or stock template.

Construction & Trades

Stringer slope length from the same rise/run geometry as STAIRS-01. Not a birdsmouth or stock template.

App id: STAIRS-03. Reference version 1.0.

How to fill it

Fill the inputs. The tool shows the outputs.

On the tool screen, Calc is the working sheet. Presets stores values you reuse. Reference is the formula, assumptions, and provenance below.

Formula

stringer = √(totalRise² + totalRun²)

Inputs

Name	Unit
Total rise	`in`
Number of risers	`1`
Tread / run	`in`
Number of treads (optional)	`1`

Outputs

Name	Unit
Stringer slope length (hero result)	`in`
Unit rise	`in`
Total run	`in`
Stair angle	`deg`
Tread cuts	`1`
Riser cuts	`1`

Diagnose

Observations are context. They do not pass or fail a structure. See Diagnose.

When	Observation	Severity
`deg > 40 or riser in > 8`	Steep stair geometry	caution

Provenance

Does not deduct stock thickness, nosing, or seat-cut geometry.