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"Round the measurements up and record them with a pen and paper. Round up the measurements that you’ve taken so far—the width of each tread and the combined length of a tread and riser—up to the nearest foot (or to the next 30 cm, if you prefer metric measurements). Then write both measurements down so you don’t forget them. For example, say that each stair which has a width of 45 in (110 cm) and a height of 18 in (46 cm). In this case, you’d round up and write: “4 ft (1.2 m) by 2 ft (0.61 m).”\nRounding the measurements up will ensure that you have a little extra carpeting to cover the steps in case any gets thrown away."
<https://www.wikihow.com/Calculate-Carpet-on-Stairs>