Stair Calculator
Calculate stair rise, run, number of treads, total height, and stringer length. Checks against IRC building code requirements.
Total vertical distance from finished floor to finished floor — measure this, don't assume 8 feet
Horizontal depth of each tread — IRC minimum is 10 inches
IRC R311.7.5.1 maximum is 7-3/4 inches (7.75)
IRC minimum is 36 inches clear width — typical residential is 36 to 42 inches
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