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Best Answer: Average width of a staircase is 36 minimum. The tread (step) is no less then 10. The rise is from 7 to 8 depending on the total rise. Take the total rise and divide by 7 1/2, average step, and that gives you you # of steps. Then take total rise and divide by # of steps, this tells you the exact size of your step. Now take size of rise and X by # of steps.
For the safety reasons and for the comfort of usage, stair measurements are recommended to follow some guidelines: The run length should be 9 inches (23 cm) or longer for enough foot space. The riser height should be 8.25 inches (21cm) or lower. The nosing protrusion length should be 1.25 inches (3.2 cm) or lower to prevent tripping on the nosing. The headroom is recommended to be 6 feet and 8 inches (203 cm) or higher. The stair width is recommended to be 35 inches (89cm) or longer. The height of the handrail, measured from the nose of the tread, is recommended to be between 34 and 38 inches (86 to 97 cm). The comfortable size of handrail diameter is between 1.25 and 2.68 inches (3.2 to 6.8 cm).