Concrete for a 12×24 slab at 5" thick
A 12 ft × 24 ft slab poured 5 inches thick needs the amounts below (a 10% waste allowance is already included).
Concrete needed
4.89cubic yards
132
cubic feet
220
80 lb bags
294
60 lb bags
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For a slab this size, 4.89 cubic yards is usually cheapest as ready-mix delivery. About 220 bags of 80 lb mix would do it by hand.