Depends on how thick it is. At 4 inches thick, you would nee about 5.5 cubic yards adjusting for safety. At 6 inches, you'd need about 8 cubic yards.
You can play with different thicknesses with the linked concrete pad calculator.
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how may yards of concrete are needed for a floor 24 x 25 feet?
This cylinder will require 1.4 cubic yards of concrete (this assumes a length of 12' and a width of 2').
1000 square feet/9 = 111.1 square yards of concrete 6 inches thick. This is the same as 111.1/4.5 = 24.7 cubic yards of concrete.
2.2469 cubic yards for each inch of depth.
That depends on the length and width of your construction.