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Stair Calculator

Number of steps, riser height, and tread depth from total rise.

Plan a straight stair run from the floor-to-floor rise: number of steps, individual riser height, and tread depth that fit a target slope.

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

in
in
in

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Steps ≈ round(total rise / target riser). Riser = total rise ÷ steps. Tread depth tunes the comfort ratio (riser × 2 + tread ≈ 25 in).

In depth

Plan a straight stair run from the floor-to-floor rise: number of steps, individual riser height, and tread depth that fit a target slope.