12 x 12 ( units inches) is one sq ft
you need 180 tiles
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100 + 10-15% = 110 - 115 pcs
180
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.
A 12 by 12 inch square is a square foot. Which means it would take 180 of them.
-- Each tile covers 12" x 12" = 1 square foot.-- To cover 180 square feet, you need nominally 180 tiles.-- The number of boxes is 180/(number of tiles per box)-- If tiles are not sold in boxes of 1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45,60, 90, or 180 to the box, then that quotient doesn't come out even. If they won'tsell you a part of a full box, then you'll need to round it to the next larger integer.