Concrete for a 24×36 slab at 4" thick

A 24 ft × 36 ft slab poured 4 inches thick needs the amounts below (a 10% waste allowance is already included).

Concrete needed

11.73cubic yards

317

cubic feet

528

80 lb bags

704

60 lb bags

Need different dimensions? Use the full concrete calculator to enter any size, thickness, and waste allowance.

For a slab this size, 11.73 cubic yards is usually cheapest as ready-mix delivery. About 528 bags of 80 lb mix would do it by hand.