18" = 1.5 feet
18" x 18" = 1.5-ft x 1.5-ft = 2.25 square feet
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One 18 inch x 18 inch tile = 1.5 ft x 1.5 ft = 2.25 sq ft.400 sq ft x 1 tile/2.25 sq ft = 177.77 = 178 tiles
1.94 sq ft approx.
18 in x 18 in = 1.5 ft x 1.5 ft = 2.25 sq feet.
379.6875 ft2
6 x 24 inch tile = 144 sq in = 1 sq ft 400/1 = 400 tiles