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"Multiply the area of 1 step by the number of steps. Count the total number of stairs and record that number. Multiply the square footage of 1 step—the number you just calculated—by the total number of steps. This is the total area, or square footage, for the stairs you plan to carpet. Say that you’ll be carpeting 12 stairs. In our example, you’d need a total of 96 square feet (8.9 m) of carpeting to cover your stairs.\nKeep in mind that the stairs may not all be in 1 row. For example, many homes have 6 stairs, then a small landing, then 6 more stairs."
<https://www.wikihow.com/Calculate-Carpet-on-Stairs>