How much concrete does it take to fill a 2'x2'x4' square hole?

To fill a 2'x2'x4' square hole, you first calculate the volume in cubic feet. The volume is 2 ft x 2 ft x 4 ft = 16 cubic feet. Therefore, you would need 16 cubic feet of concrete to fill the hole. If you need to convert this to cubic yards, it would be approximately 0.59 cubic yards, since there are 27 cubic feet in a cubic yard.