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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.
Dimensions of a Standard Door. In the U.S., the standard door size is 36 inches by 80 inches or 0.91 meter by 2.03 meters. In some areas, the usual door size is 1.2 meters by 2.1 meters, which is widely used in comfort rooms, bedrooms as well as in main entries. The width of doors is 0.8 meters or more, depending on the purpose. A door is made up of a number of important components.