Concrete for a 16×24 slab at 6" thick
A 16 ft × 24 ft slab poured 6 inches thick needs the amounts below (a 10% waste allowance is already included).
Concrete needed
7.82cubic yards
211
cubic feet
352
80 lb bags
470
60 lb bags
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For a slab this size, 7.82 cubic yards is usually cheapest as ready-mix delivery. About 352 bags of 80 lb mix would do it by hand.