You cannot.
18 is a pure number which has no length and so cannot be converted into a measure of length.
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Divide by 12.So 18 / 12 = 1.5 feet.
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.
144 square feet.
1 yard = 3 feet = 36 inches 6 yards = 18 feet = 216 inches
To convert inches to feet, you divide by 12. If you want the result as a fraction of 3 feet, you divide the result by 3.