Home & Life · Free tool
Stair Calculator (Rise, Run, Stringer)
Calculate step count, riser height, total run, and stringer length from total rise. IRC code warnings included. Free online stair calculator works instantly — no sign‑up.
Steps
15
Actual riser
7.20"
Total run
147.0"
Stringer
182.4"
Rise + Run check (target 17–18")
17.70"
Stair dimensions meet IRC R311.7 limits.
IRC: max riser 7.75", min run 10". Stringer length = √(rise² + run²). Cut stringer from 2x12 lumber; add extra for top/bottom connections.
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What it does
Total rise plus preferred riser = step count, actual riser, total run, stringer length via Pythagorean. IRC code warnings if you exceed limits.
Embed this tool on your siteShow snippetHide
Paste this snippet into any page. Loads on-demand (lazy), no tracking scripts, and sized to most dashboards. Replace the height to fit your layout.
<iframe src="https://freetoolarena.com/embed/stair-calculator" width="100%" height="720" frameborder="0" loading="lazy" title="Stair Calculator (Rise, Run, Stringer)" style="border:1px solid #e2e8f0;border-radius:12px;max-width:720px;"></iframe>How to use it
- Enter total rise.
- Set preferred riser + run.
- Read full stair spec.
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