It depends on the depth you wish to cover with. If it's going to be 1 foot deep, there are 27 cu ft in a cu yd so it will cover 27 cu ft at a depth of 1 foot. If you want 6" depth, you have 54 (27 times 2), 3" depth you will have coverage for 108 sq ft. I hope this gives you g good idea of what you are going to need.
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it will cover 3 cubic feet, or 9 feet, I am not sure how many square feet
1 cubic yard covers 27/depth in feet square feet.
744 Square Feet
1 cubic yard of concrete fills 27/depth in feet square feet.
27 square feet Answer. 15 square metres at 3 inches thick.