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"Add 2 in (5.1 cm) to the total width measurement. When carpeting professionals install the carpet, they’ll bend about 1 inch (2.5 cm) of it over on either end so that the rough-cut carpet edges aren’t visible. Without these extra 2 inches (5.1 cm) added to the measurement, you’ll find yourself short on carpet.\nSo, if the stair width is exactly 36 inches (91 cm), with the added inches, the stair now measures 38 inches (97 cm)."
<https://www.wikihow.com/Calculate-Carpet-on-Stairs>