Concrete for a 12×12 slab at 6" thick
A 12 ft × 12 ft slab poured 6 inches thick needs the amounts below (a 10% waste allowance is already included).
Concrete needed
2.93cubic yards
79
cubic feet
132
80 lb bags
176
60 lb bags
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For a slab this size, 2.93 cubic yards is usually cheapest as ready-mix delivery. About 132 bags of 80 lb mix would do it by hand.