Concrete for a 24×30 slab at 4" thick
A 24 ft × 30 ft slab poured 4 inches thick needs the amounts below (a 10% waste allowance is already included).
Concrete needed
9.78cubic yards
264
cubic feet
440
80 lb bags
587
60 lb bags
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For a slab this size, 9.78 cubic yards is usually cheapest as ready-mix delivery. About 440 bags of 80 lb mix would do it by hand.