Concrete for a 14×14 slab at 4" thick
A 14 ft × 14 ft slab poured 4 inches thick needs the amounts below (a 10% waste allowance is already included).
Concrete needed
2.66cubic yards
72
cubic feet
120
80 lb bags
160
60 lb bags
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For a slab this size, 2.66 cubic yards is usually cheapest as ready-mix delivery. About 120 bags of 80 lb mix would do it by hand.