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I think you mean 6 inches thick, not 6 feet thick. You would need 200 cubic feet, or 7.4 cubic yards.

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Q: How many yards of gravel would cover 400 sq ft at 6 thick?

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You will need about 65.185 cubic yards (83.6 tons) of gravel for this area.

5.55 cubic yards of gravel

You will need about 463 cubic yards (around 594 tons) of gravel for this area.

You'll need about 28.704 cubic yards (37 tons) of gravel.

Plan on about 2.2 cubic yards (2.8 tons) of gravel.

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It would depend on how thick you want to spread it.

You will need about 3.7 cubic yards (around 4.75 tons) of gravel.

You would need about 5 cubic yards. Gravel is usually sold by the ton. I do not know that conversion. Who ever would deliver it for you should be able to help. If I were using crushed concrete I would use 15 tons... but I can not spread it 1" thick either.

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The answer will depend on the depth to which the gravel is to be spread.

47.55 cubic yards . 4" would be 5.23 cubic yards.

You would need about 13 cu yards or about 15 tons.

The amount of gravel needed to cover 252 square feet depends on how thick (that is, deep) you want the gravel. If you want the gravel to be 3 inches thick... Convert the measurement to the same units. We'll use feet. 3 inches = 1/4 foot Multiply the thickness times the area to get volume in cubic measure. 1/4 feet x 252 feet = 63 cubic feet Gravel in the US is usually sold by the cubic yard, which is 27 cubic feet Thus, 63/27 = 2 1/3 cubic yards 2 1/3 cubic yards of gravel will cover 252 square feet of area to a dept of 3 inches.

You will need about 65.185 cubic yards (83.6 tons) of gravel for this area.

20 feet x 20 ft x .3333 ft = 133.33 cubic feet / 27 cubic feet per yard = 4.94 cubic yards

8.25 cubic yards of concrete

Approximately 24.7 cubic yards or 31.7 tons of gravel.