To calculate the square footage of an area 18 x 18, you simply multiply 18 by 18, which is 182 or when expanded and solved is 324. The units would be ft2, so your answer would be 324ft2.
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12' x 18' = 216 square feet.
12 feet x 18 feet = 216 square feet.
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18" = 1.5 feet 18" x 18" = 1.5-ft x 1.5-ft = 2.25 square feet
18 in x 18 in = 1.5 ft x 1.5 ft = 2.25 sq feet.