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"Measure upward across the tread and riser of 1 stair. Set your tape measure at the back edge of the tread, and measure the tread from front to back. Then bend the tape measure down at a 90° angle and continue measuring in the same direction down the riser. (The riser of a stair is the vertical board that elevates each tread above the previous.) Calculate the distance from the back of the tread to the base of the stair’s riser.\nIf the tread overhangs the riser, measure back to the riser itself under the overhang and then down to the bottom. You’ll use the total measurement to calculate the height of each stair.\nRisers are typically around 6–7 inches (15–18 cm) high."
<https://www.wikihow.com/Calculate-Carpet-on-Stairs>