18" x 18" = 1.5 ft x 1.5 ft = 2.25 sq ft.
Number of tiles required = 700/2.25 = 311.11... so 312 tiles are required.
That is the mathematical answer to the question. In real life, you will need to make an allowance for your skill level and the awkwardness of the shape being tiled - which will affect the proportion of offcuts that can be used.
How many 24x24 tiles it take to cover a 14×14 room
5,184 2-square-inch tiles are needed.
1540
647
18..
How many 24x24 tiles it take to cover a 14×14 room
6' x 9' (54 square feet) = 6 square yards of tiles needed.
240 square tiles are needed
5,184 2-square-inch tiles are needed.
236 18-inch tiles.
1540
Each tile covers 4 square feet. Which means you need 200 tiles to cover 800 square feet, plus spoilage.
968
647
18..
616 3x6 inch tiles are needed to cover exactly 77 square feet.
216- 2x2