How many square feet is 13 stairs? You’ll need between 80 and 110 square feet for 13 stairs.
What is the formula to calculate stairs? You divide the height by 7 inches; if, say, the floor-to-floor distance is 8 feet, 10 inches (or 106 inches), then you’ll need 15 treads (106 divided by 7 equals 15.14). Next, you divide the height by the number of treads (15 into 106), producing the exact tread height (7.06 inches).
How many square feet is 12 stairs? How many square feet is 12 stairs? For a typical set of 12 box stairs, you’ll multiply the 36” width by the 18” tread and riser, then multiply by 12 stairs. The total is 7776 square inches of carpet, which equates to 54 square feet.
What is the square footage of a step? Calculating the Area. Multiply the measurements to find the square footage of 1 step. Multiplying the rounded length and width measurements will yield the square footage of a step. The square footage—also called the area—of a step will give you the number of square feet (or meters) that you’ll need to cover with carpet