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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.
Multiply this by the number of stairs youâll be covering to determine how long of a carpet runner youâll need. For example, if the rise of your stairs is the standard 7 Â½ inches and the tread is 8 inches, the stair measure is 15 Â½ inches.. Determine the stair measure to calculate how long of a carpet runner youâll need. You can do this by measuring the rise and the tread to the nearest whole number and then adding these two numbers together. Round this up to an even number if applicable, and then add 2 inches to give yourself a buffer.