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Stair Nosing and Riser Trim Calculator

Calculate stair nosing and riser trim piece counts from riser count, stair width, and trim dimensions.

Inputs

Flight

Range: 1–60

A flight with 12 risers has 11 treads, and normally 11 nosings.

Range: 12–96 in

Range: 3–12 in

Nosing

Range: 0.5–12 in

Projecting edge of each tread.

Result

Nosings needed
11.00 nosings
Nosing length
6.0
Riser piece size
21.0
Riser trim length
252.0

How this was calculated

Nosings needed
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Planning estimate only. Verify the entered measurements, product data sheet, site conditions, and applicable local requirements before ordering or installing. This calculator does not establish product suitability or code compliance.