Concrete for a 8×12 slab at 4" thick
A 8 ft × 12 ft slab poured 4 inches thick needs the amounts below (a 10% waste allowance is already included).
Concrete needed
1.30cubic yards
35
cubic feet
59
80 lb bags
79
60 lb bags
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For a slab this size, 1.30 cubic yards is usually cheapest as ready-mix delivery. About 59 bags of 80 lb mix would do it by hand.