It is the amount of soil that will fill a space equivalent to that of a cube with edges of 1 ft.
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A cubic foot of soil is a unit of volume that represents a cube with sides that are each 1 foot long. It is commonly used to measure the amount of soil needed for gardening, landscaping, or construction projects. On average, a cubic foot of soil weighs around 75-100 pounds, depending on its composition and moisture content.
To cover 144 sq ft with soil to a depth of 6 inches, you would need 72 cubic feet of soil. This can be calculated by multiplying the area (144 sq ft) by the desired depth (6/12 ft) to get the volume in cubic feet.
To calculate the volume of soil needed, multiply the dimensions of the planter: 30 ft x 2 ft x 2 ft = 120 cubic feet. To convert cubic feet to cubic yards, divide by 27 (since 1 cubic yard is equal to 27 cubic feet), so you would need approximately 4.44 cubic yards of soil to fill the planter.
Volume = 8*4*8/12 = 21.33... cubic feet = 0.604 cubic metres.
There are 0.13368 cubic feet in a gallon.
1 gallon = 231 cubic inches1 cubic ft = 1,728 cubic inches = (1,728 / 231) gallons9 cubic feet = 9 x (1,728 / 231) = 67.325 gallons (rounded)..... regardless of what it has in it, or even if it's an empty volume.