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Know the maximum allowed riser height to determine the rise and run of stairs. For a standard straight run of stairs in a residence, the maximum stair riser height is 7 3/4 inches, and the minimum tread depth is 10 inches. The risers is the vertical part of a step, and a tread is the horizontal part that you walk on. To calculate how many risers are needed, measure the floor-to-floor height in inches, then divide the height by 7 3/4. The result will likely be a fraction, so always round up.
Everything from the height of the seat of a chair to the length of a bed is governed by the average measurements of a human body. In case of staircases too, the tread width is kept ideally a little more than the length of the average human foot (with shoes). The rise height is determined by the comfortable rise of our foot to climb an elevation. The baluster height for the railing is according to the height of the bent hand from the ground. it is considered to be standard and comfortable. If the tread is smaller in width, our whole foot will not be accommodated in it, and we can fall, while climbing up/down in a fast motion.