Cubic feet of soil?
How many cubic feet of soil would I need to fill a raised garden bed that is round. 38 inches in diameter, and 20 inches deep??
To answer your question I used a soil calculator. There are many available on line for your use. The one I used was provided by www.gardeners.com.
Entering your measurements of a 38 inch diameter container with a depth of 20 inches, the calculation for soil comes to 70.0 cubic yards or 1891 cubic feet.