On average, less than 1.
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If the perimeter is already measured in inches, there is nothing to convert. There are 18 inches in a perimeter of 18 inches.
1 foot = 12 inches, 18 feet = 216 inches.
221 inches
There are 12 inches in one foot, so 18 feet is equal to 18 x 12 inches, which is 216 inches.
48 inches by 16 inches by 18 inches = 8 cubic feet.