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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.
Use a calculator to calculate the stair riser length or the number of steps you'll need. 1  Divide the height from the first floor to the top of the second floor by a predetermined height of your choice for the riser. 2  The typical height of a riser is 6 or 7 inches (15 to 17.5 cm).f you're using 10 inch (25 cm) treads and need 20 risers, you'll multiply 10 inches (25 cm) by 19 to get 190 inches (19 times 25 cm equals 475 cm or 4.75 m). This is the total length of the stairs.