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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.
The terms run and rise refer to the measurements for each individual stair. The ideal slope is 30-35 degrees. As a rule of thumb, if you use a 7-inch rise and 11-inch run for each step, that slope should be simple to maintain. Most codes require a 3-foot passage width, but you can make them wider. The parts of the stairs you walk on are called treads, while risers take their name from the rise measurement.