Depends on how big the tiles are.
It depends on the size of the tiles and also, to some extent, on the shape of the area that you need to cover.
1080 will be your answer
972 Get a thousand, just in case.
109 You need 98 tiles to cover the area and then 10% extra for waste.
1,080 tiles exactly.
It should take about 825 1 foot square tiles to cover a floor with those dimensions. This assumes roughly a 10% waste factor.
no .of tiles = area of room /area of tiles area of room = 9 X12 X12 X12 inches ( 1 foot =12 inches ) area of tiles =3 X8 no.0f tiles =9 X12 X12 X12 inches /3 X 8 =648
15 tiles exactly.
A tile measuring 2 foot by two foot (which, incidentally, is an unusually large tile) has an area of 4 square feet, so it would take 100 such tiles to cover a 400 square foot floor.
In practice you will use more tiles than the equivalent area of the room. A 15 foot strip of tiles will require 15 times 12/13 = 13.846 tiles to cover it. This will have to be rounded to 14 tiles. That means that the 15 foot by 15 foot room will require 14 times 14 tiles = 196 tiles to cover it. And that's if you don't drop and break any or mess up one or more cuts.
You would need a total of 89 tiles (88.88 tiles exactly) with those measurements to cover that area.
12 inches = 1 foot Thus the tiles would be 1 foot square. You therefore need 30 to cover a 30 square foot room.