Stair Treads Calculator

Calculate treads, risers, nosing, and materials needed for hardwood stairs.

Results

Visualization

How It Works

Stair treads are the horizontal surface you step on, risers are the vertical face, and nosing is the rounded edge that overhangs the riser.

The Formula

Treads = Number of Steps | Risers = Steps + 1 (closed) or 0 (open)

Variables

  • Tread — Horizontal step surface (typically 10-11" deep)
  • Riser — Vertical face between treads (typically 7-8" high)
  • Nosing — Rounded front edge piece, sold in linear feet

Example

13 steps, 36" wide staircase: 13 treads + 14 risers + 39 linear ft of nosing.

Tips

  • Building code requires risers between 7" and 7-3/4" with max 3/8" variance between steps.
  • Stair treads should match your floor exactly — order from the same manufacturer.
  • Pre-finished treads save time but custom-stained gives better color matching.
  • Use tread jigs for consistent nosing overhang on each step.

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