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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.
This number must ALWAYS be rounded up to the next whole number, 13 in this case. This is the number of risers in the staircase. Once youâve determined the number of risers, you need to determine riser height. Take the total rise measurement (104 inches) and divide by the number of risers (13).104 / 13 = 8 Stairs are cut to the nearest 1/16â. In this particular example the riser height is exact.his number must ALWAYS be rounded up to the next whole number, 13 in this case. This is the number of risers in the staircase. Once youâve determined the number of risers, you need to determine riser height. Take the total rise measurement (104 inches) and divide by the number of risers (13).