Concrete for a 14×14 slab at 5" thick
A 14 ft × 14 ft slab poured 5 inches thick needs the amounts below (a 10% waste allowance is already included).
Concrete needed
3.33cubic yards
90
cubic feet
150
80 lb bags
200
60 lb bags
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For a slab this size, 3.33 cubic yards is usually cheapest as ready-mix delivery. About 150 bags of 80 lb mix would do it by hand.