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A cubic yard of stone that is 4" thick would cover 9 square yards or 81 square feet. If you need to cover 7000 sq. ft., you would need roughly 86.5 cubic yards. That's a lot of rock.

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15y ago
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Q: How do you calculate the amount of topsoil that is needed to cover 2400 sq ft of dirt with 2 inches of topsoilas measured in yards... I would guess they mean cubic yards?
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