This is not a correct conversion. Cubic feet is a measure of volume while square feet is a measure of area.
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1 cubic yard covers 324 square feet per inch of thickness, divide 324 by thickness in inches to get coverage, i.e. 4 inches thick would cover 324/4=81 square feet, 36 inches thick would cover (you guessed it) 9 square feet.
324 square inches converts to 2.25 square feet.
The easiest way is use Rule 324 (Length in Feet X Width in Feet x Height in Inches) Divided by 324 = Cubic Yards of concrete. Example 4' x 20' x 4"=320 Divided by 324 = 0.9876 Cubic Yards. Or Rule 27 (Length in Feet x Width in Feet x Height in Feet) Divided by 27 = Cubic Yards of Concrete. Example 4' x 20' x 0.33333333'=26.6666664 Divide by 27 = 0.9876 Cubic Yards.
One cubic yard will cover a 324 square-foot area with one inch of mulch. However your mulch should be 2 to 3 inches thick to maintain moisture and prevent weed growth. Be careful not to go to thick or you will cause mold to form in the mulch.
They are 324 and 361 which are both square numbers