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First convert a tile into square feet. 18 inches is 1.5 feet so the square footage of a tile is 1.5 x 1.5 = 2.25 sq. ft. Next divide this into the room square footage to see how many you need; 210/2.25 = 93.3 tiles. You next add a few to take care of waste and breakage etc. I would get a least 100 tiles and make sure you can get more if you happen to run short.

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Q: How many 18 inch by 18 inch tiles do you need to cover a 210 square foot room and can you show me how to convert?
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