Concrete for a 12×14 slab at 4" thick
A 12 ft × 14 ft slab poured 4 inches thick needs the amounts below (a 10% waste allowance is already included).
Concrete needed
2.28cubic yards
62
cubic feet
103
80 lb bags
137
60 lb bags
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For a slab this size, 2.28 cubic yards is usually cheapest as ready-mix delivery. About 103 bags of 80 lb mix would do it by hand.