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"Measure the width of 1 tread with a tape measure. The tread of a stair is the horizontal part of the stair on which you step. With a tape measure, measure from 1 side of the stair tread to the other side. Round your measurement to the nearest foot (or to the next 30 cm, if you prefer metric measurements), and record the width measurement.\nUnless you have abnormally wide or narrow stairs, they’ll measure close to 3 feet (0.91 m).\nIf you plan to only install a carpet runner down the center of your stairway, measure the width of the area that you plan to cover."
<https://www.wikihow.com/Calculate-Carpet-on-Stairs>