Concrete for a 12×12 slab at 5" thick
A 12 ft × 12 ft slab poured 5 inches thick needs the amounts below (a 10% waste allowance is already included).
Concrete needed
2.44cubic yards
66
cubic feet
110
80 lb bags
147
60 lb bags
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For a slab this size, 2.44 cubic yards is usually cheapest as ready-mix delivery. About 110 bags of 80 lb mix would do it by hand.