Concrete Calculator

Calculate concrete volume and bags needed for a slab.

Length (ft)

Width (ft)

Depth (in)

Volume

1.23 yd³

Cubic feet

33.33 ft³

80 lb bags

56

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How it works

1
Enter slab dimensions

Length and width in feet, depth in inches.
2
Read the volume

Cubic yards, cubic feet and 80 lb bags needed.

FAQ

Why 80 lb bags specifically?: It’s the most common pre-mix bag size; each yields about 0.6 cubic feet of concrete once mixed.