Concrete for a 8×8 slab at 4" thick
A 8 ft × 8 ft slab poured 4 inches thick needs the amounts below (a 10% waste allowance is already included).
Concrete needed
0.87cubic yards
23
cubic feet
40
80 lb bags
53
60 lb bags
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For a slab this size, 0.87 cubic yards is small enough to mix from bags. About 40 bags of 80 lb mix would do it by hand.