You cannot.
An inch is a measure of length or distance while a square foot is a measure of area. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
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Frst convert feet into inches . Next multiply. So 480 inches multiplyed by 72 inches equals 34,560 square inches
14 inches x 40 inches = 560 square inches = 38/9 square feet
40 square feet are 3.716122 square meters.
If you mean how many square feet are in a rectangle 62 inches by 40 inches, then there would be 17.22 square feet.
37ft by 40 inches is an area of 123.3 square feet.