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None because it's a hole but 6 cubic yards of dirt will fill it up.
Assuming 20 feet by 40 feet, 20x40x4 = 3200 cu ft = 3200/27 = 120 yards = 320,000 pounds
At 3 inch deep and 27 foot round that is 3.14 x 27x27x3/12/4 = 143 cubic feet which is 143/27 = 5.3 yards. At 100 pounds/cu ft that weighs 14,300 pounds of dirt
You are mixing volume (square yard) and area (length x width). How deep do you want the dirt? One foot deep you need about 80 square yards of dirt.
You also need to specify the average depth.(And by "yards" we assume you mean cubic yards).