it will take 54 ,18x18 pavers. which you will have to cut some on the edge.
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18" is 1.5', so we can discover the number of square feet in one paver by multiplying 1.5 x 1.5 = 2.25 square feet. To fill an area of 14' x 14', or 196 square feet, you would need 196 / 2.25 = 87 pavers, with room for .11 pavers left over. So to cover it completely, 88 pavers would do the trick.
144 Get 160 to be safe.
72 Get 80 to be safe.
12 inch * 12 inch = 1 ft * 1 ft = 1 sq ft. Therefore, a minimum of 72 pavers are needed. That answer assumes that the shape is well behaved and the pavers do not need to be cut. Or that, if they are, all the offcuts are used. Pavers may need to be cut/trimmed if, for example, the area is circular.
8'x9' = 72 square feet. You'll need 72 1' x 1' pavers.