1 cubic yard/(1/9 of a yard) = 9 square yards.
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It depends how thick the gravel is being laid - at 4 inches thick, a cubic yard will cover 81 square feet.
1.85 cubic yards...probably 25 bags or so
Volume = (1,200 square feet) x (1/3 foot) = 400 cubic feet = 14.81 cubic yards
630 cubic inches
137.5 cubic feet or 5.09 cubic yards.