A "yard of gravel" is a measure of volume, not a measure of area. There are 27 cubic feet (3x3x3 feet) in a yard of gravel, or one cubic yard.
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There are nine square feet in every square yard.
9 square feet are in a square yard.
It depends how thick the gravel is being laid - at 4 inches thick, a cubic yard will cover 81 square feet.
1 yard = 3 feet 1 square yard = 9 square feet 3 square yards = 27 square feet
There are 9 square feet in 1 square yard.