You can do one of the following to calculate this:
1) Convert inches to feet. Then multiply to get the area in square feet.
2) Multiply first, to get the area, but this time in square inches. Divide the square inches by 144 to convert to square feet.
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.
1.78 sq feet per tile.
A square 20-inch tile is 2.78 square feet.
2.25 square feet
This tile has an area of 1 ft2.
1.78 square feet.
4,800 6-inch square tiles.
There are 144 18 square inch tiles in an area of 18 square feet.
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.
1.78 square feet.
67.5
Approximately 96 square feet.
Well, let's see here, friend. To find the square footage of a tile, we need to multiply its length by its width. In this case, a 16-inch by 32-inch tile would cover 4.44 square feet. Isn't that just delightful?