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"Measure the length and width of a landing separately from the stairs. Measuring the carpet for landings is straightforward: use a tape measure to calculate the length and width of the landing. While you’re measuring the width of the landing, bend the tape measure and measure the height of the riser directly beneath it. As an example, a common landing size would measure something like 4 by 5 feet (1.2 m × 1.5 m).\nAs you did for the step measurements, round the landing measurements up to the nearest foot (or to the next 30 cm, if you prefer metric measurements)."
<https://www.wikihow.com/Calculate-Carpet-on-Stairs>