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"Calculate the area of a landing and add it to the area of the stairs. Find the landing measurements that you calculated earlier. Multiply the landing’s length times its width. This will give you the total area of the landing (and the riser just below it). Add this number to the total area of the stairs to calculate the total surface you’ll need to purchase carpet for.\nIn our example, your landing measures 4 by 5 feet (1.2 m × 1.5 m). Multiply these dimensions to calculate the amount of carpet you’ll need to cover the landing: 20 feet (6.1 m)."
<https://www.wikihow.com/Calculate-Carpet-on-Stairs>