18 what cms or inches?? Probably inches so,
Inches:
115.555556 tiles so about 116 tiles needed
1,440 square feet or 160 square yards.
1728
122.2 square yards.
The room is 11 x 14 = 154 square feet. So, you need 154 square feet of carpet.
144 square feet.
12...
20
13.333 square yards.
it will cover a 12x12 room
180 I guess
120
13-ft x 16-ft = 208 square feet