This question cannot be answered.
An area is "square", a volume is "cubic".
The question asks about the volume of an area... and is meaningless.
A square yard contains 9 square feet
An area 30 feet by 50 feet contains 1,500 square feet or 166.67 square yards
1 foot by 36 sq feet = 36 cubic feet of dirt is needed
That depends on how deep you want the dirt. For 32 sq ft and 2 inches deep, that is 32 x 2/12 = 5.33 cu ft. Dirt weighs 100 pounds per cu ft, so you need 533 pounds; at 40 pounds per bag that is over 13 bags. For one inch deep, it is less than 7 bags and for 4 inch, 26 bags
There is no dirt in a hole that is 3 feet deep and six inches in diameter.
2.37 cubic yards of dirt is needed to fill an 8'X4' that is 24" deep garden box. If the box is filled 12 inches, the amount of soil needed is 1.19 cubic yards and that should be deep enough for most vegetables.
10-1/2 cubic yards
10*13*3 = 390 cubic inches.
You will need 1500 cubic feet.
24 x 8/12 = 16 cubic feet.
none there is no dirt in a hole
None. There is nothing in a hole.
None! If there was dirt in it then it wouldn't be a hole.
6,400 ft3