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.
16 x 16. Actually if you do the math, you could do a 18 x 18, but you never get 4 yards and you rarely get a form that is a perfect .33 feet.
One should be more than enough!
18*18 = 324 tiles.
129
12 units x 12 units = 144 square units of length. 4 units x 18 units = 72 square units of length. Since no units of length are given, it is assumed that the same unit is intended and, in that case, the answer is half a paver.
13.5 cu ft
Depending on the use of the concrete, between 5-6 bags.
On the Patio - 2012 Mothers Day Special 1-18 was released on: USA: 11 May 2012
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For a hole 36" deep X 18" diameter, you would need approx. 1/5 cu. yd. concrete.
Based on your dimensions and a standard 3.5" to 4" thickness you will need 7 yards of concrete.
Concrete Angel was created on 2002-11-18.