9" x 9" tile = 81 sq inches
12' x 15' = 144" x 180"
144" x 180" = 25920 sq inches
25920" / 81 = 320 tile
I would buy for waste though 345 tile! You always want to have all your tile in 1 dye lot.
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178 tiles
16 if there is no wastage or cutting.
81 tiles squared because if it's a square then it would be 9x9 which is 81
If it is nine feet by nine feet, then it is 81 square feet.
9x9=81