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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 Divide Total Rise By Maximum Riser Height-Before you can begin calculating your stair stringer layout, you'll need to measure the total rise. 2  For stairs that land on the ground, the total rise is the distance from the ground to the top of the finished floor.