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Actually, if I understand correctly, you should have divided your total square inches by 144 to get your total # of square feet. Note that 1' X 1'= 1 square foot. This is the same as saying 12" x12" = 144 square inches . Divide 144 sq inches by 144 and you get 1 square foot. Remember to buy extra to allow for waste, especially if you are installing on the diagonal.
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