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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.
Step length  The riser is about seven (7) inches. The depth of the step is about seven to eight. There is a formula for calculating the number of steps one should have for â¦ a particular height -- 8 foot, 10 foot, and the like.    Stairs are built on a 7-11 risers being approx. 7 and the tread being approx.