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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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14y ago

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Q: How many 9x9 tiles to cover 12'x15'?
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