A minimum of 1.23 cubic yards at 4" thick.
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A 14'x14'x4" inch slab will require 2.42 cubic yards of cement.
how many yards of concrete will i need to do a 20 x20 x4 slab
You will need 3.1 cubic yards or 139 80lb bags. This assumes a waste of about 5% which is typical.
You will need a minimum of 7.41 cubic yards.
You will need a minimum of 3.56 cubic yards.