Q: How much concrete is needed for an area 8' x 4' and 3 deep?

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84 cubic inches!

1.54321 cubic yards See the related link below

volume of trench = 10' x 3' x 54' = 1620 cubic feet therefore 1620 cubic feet of concrete will be required.

That depends on how deep you want to spread it. On that area, it takes 0.463 cubic yards for every inch deep.

It depends on how thick you want the concrete.

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0.246914 cu. yards (6.666667 cu. ft ) of concrete is needed.

You need to specify how deep the area is to answer the question; this is a volume problem. Please ask again

54sqare feet

84 cubic inches!

9x12 feet at 4 inches deep: 1.3 cubic yards.

3.0107 cubic meters

about 17 yards of concrete (it's sold by the cubic yard)

1.54321 cubic yards See the related link below

How deep do you want the concrete to be?

An 80lb bag of concrete you can at your local home improvement store covers about 4 square foot at 2" thick. So you would need about 144 bags of 80lb concrete.

volume of trench = 10' x 3' x 54' = 1620 cubic feet therefore 1620 cubic feet of concrete will be required.

4 inches deep would be the minium coverage of sand needed for a horse area