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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.
So for our 10 run, a stair rise of between 7 and 7.5 would work great. If you don't like to use fuzzy rules of thumb, check out the stair rise/run table. To figure out what the exact riser height should be, we divide the distance from the top of the deck to the ground.Whatever number we choose for our riser must divide evenly into that total height measurement.f you don't like to use fuzzy rules of thumb, check out the stair rise/run table. To figure out what the exact riser height should be, we divide the distance from the top of the deck to the ground. Whatever number we choose for our riser must divide evenly into that total height measurement.