Find out how many square feet you need, and multiply that number by four.
For example: If your room measured 10 feet by 10 feet, you need 100 square feet. For 6 inch tile, multiply that by four and you find you'll need 400 tile.
236 18-inch tiles.
5,184 2-square-inch tiles are needed.
400 6" x 6" tiles are needed.
128.2 tiles
22.2 tiles so buy 23 tiles.
It would be 9 tiles wide by 12 tiles long. That gives you a total of 108 tiles.
35
54
247.1
I hope you meant 20 inch by 20 inch tiles, but the answer is around 13.38
You will need 44 six inch tiles to cover 11 square feet.
720 4"x 8" tiles are needed.