basic

Stair Stringer Calculator

Steps and stringer length from rise and run.

Compute the number of steps, individual riser height, individual tread depth, and the diagonal stringer length for a stair from the total rise, total run, and target riser height.

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). Stringer = √(rise² + run²).

In depth

Compute the number of steps, individual riser height, individual tread depth, and the diagonal stringer length for a stair from the total rise, total run, and target riser height.