Concrete for a 16×16 slab at 4" thick
A 16 ft × 16 ft slab poured 4 inches thick needs the amounts below (a 10% waste allowance is already included).
Concrete needed
3.48cubic yards
94
cubic feet
157
80 lb bags
209
60 lb bags
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For a slab this size, 3.48 cubic yards is usually cheapest as ready-mix delivery. About 157 bags of 80 lb mix would do it by hand.