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"Multiply the measurements to find the square footage of 1 step. Multiplying the rounded length and width measurements will yield the square footage of a step. The square footage—also called the area—of a step will give you the number of square feet (or meters) that you’ll need to cover with carpet. So, the calculated area of 1 of the stairs in our example would be: 8 square feet (0.74 m).\nIf you plan to install carpet padding beneath the carpet on the stairs, add 3 inches (7.6 cm) to the total area of the stair before rounding."
<https://www.wikihow.com/Calculate-Carpet-on-Stairs>