Concrete for a 10×20 slab at 6" thick
A 10 ft × 20 ft slab poured 6 inches thick needs the amounts below (a 10% waste allowance is already included).
Concrete needed
4.07cubic yards
110
cubic feet
184
80 lb bags
245
60 lb bags
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For a slab this size, 4.07 cubic yards is usually cheapest as ready-mix delivery. About 184 bags of 80 lb mix would do it by hand.