Compute integer risers, actual step heights and a defined n−1 tread flight with a dimensioned stair and stringer reference.
01 / PURPOSE-SPECIFIC INPUTS
Upper floor is the last walking surface: n risers, n−1 treads. Landing means a top platform. User dimensions do not establish local code compliance.
02 / RESULT & INTERACTIVE INSPECTION
This model covers one straight flight with an optional top landing. Equal risers, n−1 treads and stringer endpoints are defined explicitly. No result claims building-code compliance or structural adequacy.
Riser 1: 17.5 cm; cumulative height 17.5 cm. A tread advances 28 cm.
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The upper floor supplies the final walking surface. A single straight flight therefore has n integer risers and n−1 treads. For sixteen risers, fifteen tread goings contribute to the flight run.
Compute integer risers, actual step heights and a defined n−1 tread flight with a dimensioned stair and stringer reference. Inspect actual values and worked assumptions through accessible interactive controls.
Stair Calculator calculations run locally in browser memory. Expressions, measurements, schedules and datasets are not sent to an external calculation-processing API or saved as a personal profile. Ordinary website requests may still be logged. Clipboard access occurs only when you choose Copy Result.
The upper floor supplies the final walking surface. A single straight flight therefore has n integer risers and n−1 treads. For sixteen risers, fifteen tread goings contribute to the flight run.
Actual equal riser height is 280/16 = 17.5 cm. With 28 cm going, fifteen treads give 420 cm flight run. The actual riser is recomputed after the integer count is chosen.
It rounds total rise divided by the desired maximum height upward to an integer, then recomputes equal actual heights. This model supports two through one hundred risers and at most twenty meters total rise.
The reference joins the first tread nosing at one-riser height to the upper-floor nosing. Its vertical span is (n−1) riser heights and its horizontal span is the n−1-tread run. The floor-to-floor envelope diagonal is shown separately.
No. It is a horizontal platform at the top level. It adds to the footprint run but not to the sloped stringer length. Intermediate landings and multiple flights require a different model.
No. They compare actual dimensions only with optional user-entered constraints. Local jurisdiction and occupancy rules, headroom, guards, nosing, attachments and structural design are not certified by this geometry calculator.