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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.
Stair measurements: 1  The rise height of each step is measured from the top of one tread to the next. 2  The tread depth or length is measured from the edge of the nosing to the vertical riser.  The total run of the stairs is the horizontal distance from the first riser to the last riser.