I need to know how thick the layer of gravel is meant to be.
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744 Square Feet
5ton
13 1/4
That depends on how deep you want to spread it. To cover 600 square feet, you need (111/9) cubic yards for every 6 inches of depth.
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.