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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.
Residential. The OSHA guideline for residential stairs sets the minimum vertical rise for each step at 4 inches and the maximum at 8 1/4 inches. An international building code, however, puts the maximum at 7 3/4 inches.n industrial applications, OSHA puts the minimum rise at 6 1/2 inches and the maximum at 9 1/2 inches, but ties the rise to the angle of the stairs. For instance, it sets the rise for stairs on a 35-degree angle at 7 1/4 inches.