Concrete for a 12×24 slab at 4" thick
A 12 ft × 24 ft slab poured 4 inches thick needs the amounts below (a 10% waste allowance is already included).
Concrete needed
3.91cubic yards
106
cubic feet
176
80 lb bags
235
60 lb bags
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For a slab this size, 3.91 cubic yards is usually cheapest as ready-mix delivery. About 176 bags of 80 lb mix would do it by hand.