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How many yards of cement do you need for a 20.5 x 21 x 4 slab?
Wiki User
∙ 12y ago
About .0369 cubic yards.
20.5"x21"x4"=1722 cubic inches
1 Cubic yard of concrete is 27 cubic feet (9'x9'x9')
1 cubic foot of concrete is 1728 cubic inches (12"x12"x12")
1 cubic yard = 27 x 1728 = 46656 cubic inches
1722/46656 is approximately .0369
This would be a little less than two 80# bags of concrete mix
Wiki User
∙ 12y ago
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