Concrete calculators for estimating bags, yards, and costs. Compare options for driveways, foundations, and outdoor projects.
Concrete is sold by volume, poured by area, and priced by both.
Every concrete estimate starts as length times width times thickness, and the thickness is where most people go wrong. An inch of extra depth on a 400 square foot slab is another 1.2 cubic yards, which is roughly a third of a truck. Suppliers sell in cubic yards and charge a short-load fee below about 3 yards, so the difference between ordering 2.8 and 3.1 changes the price per yard as well as the total.
The second thing driving cost is what goes under and through the slab. A compacted gravel base, wire mesh or rebar, and control joints cut at the right spacing are the difference between a slab that lasts thirty years and one that cracks in its second winter. None of them are optional, and all of them are the first items a cheap quote leaves out.
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