Sold by full boxes only:
13x13 has 12.912 square feet in a box and 11 pieces
10x16 has 10.76 square feet in a box and 10 pieces
8x10 has 10.76 square feet in a box and 20 pieces
2x2 mosaics are 1.17 squarefeet a piece.
All bullnose and mosaics are sold by piece.