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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.
Stair stringer size. The stair stringer size can be chosen in the 7 inches for gaining the comfortable step of your stair. The, round the number of the calculation in the previous step for knowing how many steps that you will need in your staircase. Do not forget for writing the height of the steps which is needed. The next step in how to figure stair stringer length is deciding the tread depth or length of the stairs treads.