6-in x 18-in = 0.5-ft x 1.5-ft = 0.75 square ft.
144/0.75 = 192 tiles (plus a few extra, in case any are spoiled or have to be cut)
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144
A 13 x 13 tile is 1.74 sq ft. 144/1.74 = 123 tiles
12 x 12 = 144 26208 / 144 = 182 So, you will need 182 tiles
220 x 144 = 31,680 sq inches / 324 (18" x 18") =97.7 + 30% waste = 130 tiles
440 sq feet = 440 x 144 sq inchesanswer = 440 x 144/ (20 x 20) = 440 x 144 /400 = 1.1 x 144 = 158.4 tiles ~ 159 tiles