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90 X 144 (INCHES PER SQ FT) = 12,960 INCHES. 12,960 INCHES DIVIDED BY 12 (INCHES PER LINEAR FT) = 1080 LINEAR FEET
1 ft^2 = 144 in^2
Total square inches divided by 144 = square ft.
You don't. You either A) convert 18 cubic inches into cubic feet, or B) convert 18 square inches into square feet. A... there are 1728 cubic inches in a cubic foot, so 18 cu in would be 0.00104 cu ft. B... there are 144 square inches in a square foot, so 18 square inches would be 0.125 sq ft.
To convert square ft to square inches, multiply by 144 (there are 12x12 square inches in a square foot). 8x144=1152 sq in.