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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.
Stay within the regulations for deck stairs. Stairs must be at least 36- inches wide, not including the handrails, and they must rise no higher than 12 feet. If you want your deck stairs to extend higher, you need at least one landing for every 12 vertical feet. Determine your dimensions.