You can't convert the two. One is measurement of weight, and the other is a measurement of mass.
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3
I'll convert the dimensions into yards, so it is a 3 yard by 1 yard by half a yard hole. And 3 yards x 1 yard x 1/2 yard = one and a half cubic yards.
5' * 3' * 2' = 30 cubic feet = 30/(3*3*3) cubic yards = 1.11... cubic yards.
to figure yards of soil you need cubic feet ( 400 sq ft X how deep??)then divide by 9
3.7