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IRC code: max rise 7¾ inches, min run 10 inches, min width 36 inches. Total rise / number of risers = rise per step. Number of risers = total rise / desired rise (round to nearest integer). Run × (risers − 1) = horizontal run. Stringer length = √(total rise² + total run²). Comfortable ratio: 2 × rise + run = 24–25 inches. Consistent rise height is critical for safety.
~15 risers