how many bags of concrete would a 20' x 20' x 4 inch thick slab take?

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Sakrete Customer Care · Answer

It would take approximately 351 of the 50 lb bags of Fast Setting to fill that area. It is too large an area and would not be possible because the material would setup too quickly. You are going to need almost 5 yards of concrete.

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You need at least 351 bags of concrete for a 20' x 20' x 4-inch thick slab.

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CommunityAnswer · Answer

You need at least 351 bags of concrete for a 20' x 20' x 4-inch thick slab.