Concrete for a 24×36 slab at 6" thick
A 24 ft × 36 ft slab poured 6 inches thick needs the amounts below (a 10% waste allowance is already included).
Concrete needed
17.60cubic yards
475
cubic feet
792
80 lb bags
1056
60 lb bags
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For a slab this size, 17.60 cubic yards is usually cheapest as ready-mix delivery. About 792 bags of 80 lb mix would do it by hand.