Use this calculator to help estimate the concrete you would need for your mono slab project. A mono slab (monolithic slab) or as some people call it a slab-on-grade is a slab that is with thickened edges for the footings. Basically the slab and footings are poured a the same time.
Two estimate concrete for your mono slab you will need to know the length and width of your entire slab surface. You will also need to know the depth of the slab for the portion not poured over the footings and the depth of the slab over the footing. You will also need to know the width of your footing.
For example you may have a 30' x 40' mono slab that is 4" deep in the center and the footing may be 18" deep (from top of the slab to bottom of the footing. the "thickened portion (for the footing may be typically 16"-24" wide.
This calculator assumes that the footing runs on all four sides of the slab. There is also an option for an interior footing.
Of course we are always excited to talk with you about your project and would be glad to try and answer any questions you may have.