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Simple. 18"x18" = 324 inch². One Square foot (12"x12") is 144 inch². So, take your 140 ft² and multiple it by 144 that converts your square foot requirement to square inch requirement. 140x144 = 20,160 inch². Divide 20,160 (your inch² area) by 324 (the area each tile covers) and you get 62.22 tiles. Now, you need to factor in waste, that is the partial tile, cuts, and damage that will be thrown away. Normally, figure 10-15% based on the configuration of the area. If you are intalling in a kitchen that has pantries and refrigerator cutouts, that will increase your waste. If you are tiling a square room, it will likely be less.

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Q: How many 18 x 18 tiles equal 140 sq feet?
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