I could just tell you, but it would be better if you knew how to figure it out. So I'll do both.
A cubic yard is equal to 27 cubic feet ( 3 x 3 x 3 feet ).
or 46,656 cubic inches.
Your garden is 104 x 144 x 12 inches or 8-2/3 x 12 x 1 feet.
( Let's stick with feet and eliminate one conversion! )
8-2/3 x 12 x 1 = 104 cubic feet.
Taking your measurement and dividing it by the number of cubic feet in a cubic yard gives us -
104 / 27 = 3.85 cubic yards
Call it 4 cubic yards to fill any little imperfections and you're good to go.
You already have a square yard of topsoil, so how does 20 inches of depth get you the volume of topsoil? There are 36 inches in a yard, and you have 20 inches of topsoil depth that's 20/36ths of a yard of topsoil depth. That's 0.555... or about 0.56 yards. The volume of topsoil is 1 yard by 1 yard by 0.56 yards, or about 0.56 cubic yards of topsoil.
Slightly less than 26 cu. yards.
You would need 31.88 cubic yards of topsoil to cover 855 sq feet at 6 inches deep.
Almost exactly 2.00 cubic yards for every inch of topsoil depth.
To determine the amount of topsoil needed for one acre at a depth of 4 inches, first convert the depth from inches to feet: 4 inches is 1/3 of a foot. There are 43,560 square feet in an acre, so the volume in cubic feet is 43,560 sq ft * (1/3 ft) = 14,520 cubic feet. Since there are 27 cubic feet in a cubic yard, divide by 27 to find the volume in cubic yards: 14,520 / 27 ≈ 538.89 cubic yards. Therefore, you will need approximately 539 cubic yards of topsoil.
Grass typically needs about 6 to 8 inches of topsoil to thrive.
if that is 3 ft deep it would require 96 yards... IF it is 3 inches deep it would require 24 cubic yards
8 yards = 288 inches, since there are 36 inches in a yard.
135 inches = 3.75 yards
77/9 cubic yards for every inch of depth.
77 inches is 2.1388888889 yards. 77 inches is 2.1388888889 yards.
1.25 yards is 45 inches.