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cylinder 18 feet diameter x 1.5 feet deep volume = 381 cubic feet
1 foot by 36 sq feet = 36 cubic feet of dirt is needed
Assuming 20 feet by 40 feet, 20x40x4 = 3200 cu ft = 3200/27 = 120 yards = 320,000 pounds
To fill a hole 2 feet long, 4 feet wide, and 6 feet deep would take 48 (2 x 4 x 6) cubic feet of dirt.
12 x 12 x 3 = 432 ft^3 = 144 yds^3
36 cubic feet of dirt=)
cylinder 18 feet diameter x 1.5 feet deep volume = 381 cubic feet
1 foot by 36 sq feet = 36 cubic feet of dirt is needed
8.333 cubic feet
If the raised garden has dimensions of 5 x 5 x 1 then it requires 25 cubic feet of dirt to fill it.
39,600 cubic feet. 1,466 cubic yards or about 122 truckloads if it were non-compacted fill.
Assuming 20 feet by 40 feet, 20x40x4 = 3200 cu ft = 3200/27 = 120 yards = 320,000 pounds
To fill a hole 2 feet long, 4 feet wide, and 6 feet deep would take 48 (2 x 4 x 6) cubic feet of dirt.
if you mean a 30 foot diameter circle, then pi x 152 x 3 = 2119.5 cubic feet of dirt
12 x 12 x 3 = 432 ft^3 = 144 yds^3
This question is about a cubed area. First convert the inches to feet--18 inches is 1.5 feet. Then multiply all three numbers by each other. 15*12*1.5 is 270. You will need 270 cubed feet of dirt to fill the area.
Just multiply 1/2 foot x 12,000 square feet. The answer will be in cubic feet.