How to Calculate Floor Tiles
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Use the tape measure to measure the length and width of the room to tile.
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Multiply the length by the width to find the room's square footage.
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Multiply the square footage by 10 percent, or 0.10, to determine the additional amount for mistakes and waste.
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Add this number to the square footage measurement for the total area to be covered by tile.
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Divide this number by the square footage found on a carton of floor tiles to determine how many cartons of tile are required.
