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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.
1 The width of the steps is flexible. 2  A wide deck staircase (5 feet and beyond) feels graceful and looks it too. 3  A narrow one, for example 3 feet wide, might feel cramped. 4  Very wide steps are great...if you have the room for them and they work with your design. 5  These usually work best with a single set of deck stairs.