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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.
Add their totals and write them down for later reference. Use the tape measure to check the depth of each tread, from front to back. Measure the height of each riser, from the bottom of the preceding step to the lip of the next higher up or vice versa. Check the width of the stairs with the tape measure. Multiply this number by either the height of the riser or the depth of the tread to get your measurements for how much material you need for each section. Add the two sections together to get your total square footage.