Concrete Volume Calculator

Cubic yards of concrete for a slab plus the number of premix bags needed.

Length (ft):

Width (ft):

Thickness (inches):

How to use

Enter slab dimensions and click Calculate. Everything runs in your browser — nothing is uploaded or stored.

How many 80 lb bags per cubic yard?

About 45 bags of 80 lb mix per cubic yard.

Should I order extra?

Yes — order 5–10% extra; short loads are expensive.

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