Concrete for a 10×12 slab at 5" thick
A 10 ft × 12 ft slab poured 5 inches thick needs the amounts below (a 10% waste allowance is already included).
Concrete needed
2.04cubic yards
55
cubic feet
92
80 lb bags
123
60 lb bags
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For a slab this size, 2.04 cubic yards is usually cheapest as ready-mix delivery. About 92 bags of 80 lb mix would do it by hand.