A square foot is a unit of area. An inch is a unit of length. The two units are therefore incompatible.
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Each square foot contains 144 square inches; note that one linear foot equals 12 inches.
One square foot.
144 equals on square foot.
one square foot equals 144 square inches 600 square ft is 86,400 sq inches
There are 12 inches in a foot, and there are 12 x 12 square inches in a square foot. Lock that idea in. One square foot equals 12 x 12 square inches. That's 144 square inches in one square foot. An area of 155 square feet contains 144 x 155 square inches, or 22,320 square inches.