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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.
For a 4-inch depth you will need 7.41 cubic yards.
2.25 square feet.
If you use a standard 4-inch depth, you will need at least 8.9 cubic yards.
1704 8 in X 16 in face is .88 sq ft