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Calculate stair dimensions including number of steps, riser height, total run, and angle.
Building codes typically allow 4-7.75 inches riser height. 7 inches is common for residential.
Minimum tread depth is typically 10 inches, with 11 inches being standard for comfort.
An 11-inch tread depth combined with a 7-inch riser height is considered the most comfortable stair proportion. The formula 2R + T (2 × riser + tread) should be between 24 and 25 inches for optimal comfort.
The IRC requires maximum riser height of 7.75 inches, minimum tread depth of 10 inches, minimum stair width of 36 inches, and handrails on stairs with 4 or more risers. Local codes may vary.
Material estimates are approximate. Actual quantities may vary due to waste, site conditions, design changes, material dimensions, labor methods and local pricing. Always verify with a qualified contractor or supplier before purchasing materials.