18 inches is equal to 1.5 feet.
Therefore the area is 1.52 = 2.25 square feet.
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2.25 square feet
4,800 6-inch square tiles.
It is not clear what is meant by an "18x18 square feet" tile. 18ft * 18 ft = 324 square feet, so that one tile will be more than enough. An 18 inch by 18 inch tile cannot be a 18x18 square feet tile.
67.5
440 6-inch square tiles.