Concrete for a 10×20 slab at 4" thick
A 10 ft × 20 ft slab poured 4 inches thick needs the amounts below (a 10% waste allowance is already included).
Concrete needed
2.72cubic yards
73
cubic feet
123
80 lb bags
163
60 lb bags
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For a slab this size, 2.72 cubic yards is usually cheapest as ready-mix delivery. About 123 bags of 80 lb mix would do it by hand.