Stair Calculator

Formula and source

Riser height and tread depth from total rise / number of risers; standard 7″ max riser, 11″ min tread per IRC 2021 §R311.7.

IRC 2021 (International Residential Code). §R311.7.

Audience

This tile is built for carpentry and the adjacent professions in the Carpentry and Construction group. The interactive calculator runs entirely in your browser. No account, no fee, no advertising, no tracking.

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Posture

Rough Logic answers the math question the working professional asks on the job. The site is a calm, fast, ad-free, account-free, ever-free reference. It does not interpret code. It does not replace the licensed professional. It does not store your inputs. The Authority Having Jurisdiction governs all installations and inspections.