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Concrete Slab Calculator

Cubic yards and bags of concrete for a slab.

Planning a concrete project?

Tell us what you need and local pros will get in touch. Free, no obligation.

Save your results to your home — free.Open the full tool →

How to use this calculator

  1. Enter the slab length, width, and thickness.
  2. See the volume in cubic yards and the bags required.
  3. Compare bag cost against ready-mix delivery.

Tired of calling around? Post your project once and let local pros come to you.

Frequently asked questions

How many bags of concrete are in a cubic yard?
It takes about 60 sixty-pound bags or 45 eighty-pound bags to make one cubic yard of concrete.
Should I use bags or ready-mix?
For small jobs under about a cubic yard, bags are convenient. For larger slabs and driveways, ready-mix delivery is cheaper and faster.
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