Concrete Calculator

Enter the slab size and thickness to get cubic yards for a ready-mix order, or the number of premix bags for small jobs.

Concrete calculator (slab)

Concrete needed

1.36 cu yd

36.7 cubic feet

80 lb bags (0.60 cu ft each): 62
60 lb bags (0.45 cu ft each): 82

Ready-mix trucks usually deliver in quarter- or half-yard steps; round up. Standard slab thickness is 4 inches for patios and walks, 5–6 inches for driveways.

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Frequently asked questions

How many bags of concrete for a 10 × 10 slab?

At 4 inches thick, about 1.23 cubic yards: roughly 56 bags of 80 lb mix or 75 bags of 60 lb mix before waste.

How many cubic feet in a yard of concrete?

27.

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