Stair Stringer Calculator
- Steps (risers)
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- Riser height
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- Total run
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- Stringer length
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- Angle
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IRC: riser ≤ 7.75″, tread ≥ 10″, 2 × riser + tread between 24–25″. Most jurisdictions require 2 outer stringers + 1 middle for spans > 36″.
About this tool
Stair Stringer Calculator is a single-purpose utility on instant.tw, a free toolbox of calculators, converters, generators, and quick lookups. Everything works in your browser — nothing is uploaded, nothing is stored on a server unless explicitly noted.
Category: Trade & Construction Calculators. Browse more Trade & Construction Calculators tools.