You just need to know your square footage, so length x width add 10% if laying straight 15% if in a pattern. If you want to know exactly how many pieces you need then each 18x18 contains 2.25sf. So just divide your square footage by 2.25
Tip: If your length and width are in inches then after you add your overage divide by 144.
To calculate the number of 18x18 ceramic tiles needed for a 12x12 room, first determine the area of the room and the area of one tile. The area of the room is 144 square feet (12x12), and the area of one tile is 2.25 square feet (1.5x1.5). Dividing the room area by the tile area, you'll need about 64 tiles (144 ÷ 2.25). It's advisable to purchase a few extra tiles to account for cuts and breakage.
Whatever the lxw of a single tile is ,divide that into the lxw of the room.
You calculate the sqft of the room, a sqft is still a sqft no matter what the tile dimensions are
144/2.25=64. 18x18 tile cover 2.25 sq ft area.
To calculate the square footage of an 18x18 tile, you multiply the length by the width. Thus, 18 inches multiplied by 18 inches equals 324 square inches. To convert square inches to square feet, divide by 144 (since there are 144 square inches in a square foot). Therefore, an 18x18 tile covers 2.25 square feet.
160 of them.
To calculate the number of 18x18 ceramic tiles needed for a 12x12 room, first determine the area of the room and the area of one tile. The area of the room is 144 square feet (12x12), and the area of one tile is 2.25 square feet (1.5x1.5). Dividing the room area by the tile area, you'll need about 64 tiles (144 ÷ 2.25). It's advisable to purchase a few extra tiles to account for cuts and breakage.
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.
The standard tile measure used for determining the dimensions of a room is square feet.
2.25 square feet
Whatever the lxw of a single tile is ,divide that into the lxw of the room.
You calculate the sqft of the room, a sqft is still a sqft no matter what the tile dimensions are
width times length 10 x 12 room needs 120 tile.
144/2.25=64. 18x18 tile cover 2.25 sq ft area.
The diagonal of an 18x18 tile is 18*sqrt(2) = 25.46 units.
To calculate the square footage of an 18x18 tile, you multiply the length by the width. Thus, 18 inches multiplied by 18 inches equals 324 square inches. To convert square inches to square feet, divide by 144 (since there are 144 square inches in a square foot). Therefore, an 18x18 tile covers 2.25 square feet.
You would need 800 tile assuming you had no waste at all. Since this is unlikely you will need 825 tile.