1000000 cubic yards
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.
77/9 cubic yards for every inch of depth.
Almost exactly 2.00 cubic yards for every inch of topsoil depth.
331/3 cubic yards for each foot of thickness. 27/9 cubic yards for each inch of thickness.
It takes 5.0926 cubic yards or 137.5 cubic feet.
Slightly less than 26 cu. yards.
There are 764.554858 liters in a cubic yard of topsoil (or anything else).
That depends on the depth of the topsoil you will put down. Multiply the number of square feet by the depth of topsoil--that will give you the number of cubic feet. To convert to cubic yards, divide the number by 27. So, for example, if you are using 3" of topsoil over 880 square feet then your calculation would be: 880 times .25 (3" = .25 feet) = 220 cubic feet (divided by 27--there are 27 cubic feet in a yard) equals 8.15 cubic yards.
For a 17' x 17' by 4" slab you will need 3.6 cubic yards. If you increase the thickness to 6" you would need 5.4 cubic yards.
15.833... [cubic] yards.
How many cubic yards in an 12 foot diameter circle with a 4 inch thickness?
Assuming you pour to a thickness of 4", this area requires 4.75 cubic yards.