That depends on how thick you want it. Multiply 18ft * 18ft * thickness (in units of feet). That will give you your volume in cubic feet. To convert it to cubic yards divide your answer by 27.
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18*18 = 324 tiles.
13.5 cu ft
Depending on the use of the concrete, between 5-6 bags.
about 432 cubic inches
36 square yards.