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Concrete Slab Calculator

Calculate cubic yards, cubic feet, and bags needed for a concrete slab.

The concrete slab calculator estimates cubic yards, bag count, and rebar for any pour. It accounts for your slab dimensions, number of slabs, and a customizable waste factor so your order is accurate the first time. Use it to budget materials and avoid costly short pours on the job site.
  • Always add at least 10% waste factor — concrete can't be returned and a short pour means a second truck charge.
  • Order in full cubic yard increments; most suppliers charge a short-load fee for orders under 3 yards.
  • For slabs thicker than 6 inches, get a structural engineer to specify rebar spacing — the default 12-inch grid may not be sufficient.
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