Concrete for a 40×60 slab at 5" thick
A 40 ft × 60 ft slab poured 5 inches thick needs the amounts below (a 10% waste allowance is already included).
Concrete needed
40.74cubic yards
1100
cubic feet
1834
80 lb bags
2445
60 lb bags
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For a slab this size, 40.74 cubic yards is usually cheapest as ready-mix delivery. About 1834 bags of 80 lb mix would do it by hand.