United States · Stairs

Stair Stringer Calculator

Estimate stair riser count, actual rise and stringer run from total rise, target riser height and tread depth. Enter project measurements and product assumptions that match your job and local supplier information.

US customary unitsRuns in your browserFormula & assumptions ↓

Your inputs

Your results

Enter your values and calculate to see the result.

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How this Stair Stringer Calculator works

The calculator uses total rise, target riser height, tread depth. Inputs remain editable so the estimate can reflect the actual project instead of a fixed national price or product assumption.

Formula and assumptions

The result is calculated from the measurements and rates entered above using standard geometry and unit conversions. Where a density, coverage, spacing or waste factor is requested, use the specification for the material you plan to buy.

How to get a better estimate

Measure the finished project area carefully, separate irregular sections when useful, and include realistic waste for cuts, breakage, compaction or field adjustments. For structural or code-sensitive work, this quantity estimate does not replace approved plans, span tables, engineering or local building-code requirements.

Browse all US home & construction calculators for more material, framing, roofing, concrete and landscaping tools.

How to use this calculator

  1. Set Total rise (default 108).
  2. Set Target riser height (default 7.5).
  3. Set Tread depth (default 10).
  4. Select Calculate to update the result. Reset restores the starting values.

Planning estimate only. Product dimensions, site conditions, local codes, installation methods and manufacturer coverage can change final quantities. Confirm final orders with your supplier or contractor.

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