At a poured depth of 4 inches, you will need 4.94 cubic yards.
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One square yard equals nine square feet, therefore 400 sq.ft. is 44.4444 square yards.
3,600
44.44 square yards.
160,000 square yards
It depends upon how thick you want the concrete. For example, if you want the concrete to be 6 inches thick, then you will need 200 cubic feet. There are 27 cubic feet per cubic yard; so divide the 200 cubic feet by 27 to get 7.4 cubic yards.