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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.
1 For straight steps, measure one riser and one tread to give the length need for each step. 2  Include the ânoseâ in the measurement (see drawing A). 3  Check that all treads and risers on your stairs have the same measurements. 4  Count steps and check for differing depths. For straight steps, measure one riser and one tread to give the length need for each step. 2  Include the ânoseâ in the measurement (see drawing A). 3  Check that all treads and risers on your stairs have the same measurements. 4  Count steps and check for differing depths.