Concrete Slab Cost Calculator
Estimate concrete volume and material cost for a rectangular slab.
Formula and assumptions
Excludes labor, delivery, reinforcement, site preparation, minimum-load fees and taxes.
Results depend on the inputs and assumptions shown. Check units and independently verify important decisions.
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Frequently asked questions
How much concrete does a slab need?
For a rectangular slab, multiply length by width by thickness to get volume, convert the units consistently, then convert cubic feet to cubic yards by dividing by 27.
Why add a waste allowance?
An allowance can account for uneven subgrade, spillage and ordering constraints. The right amount depends on site conditions and supplier requirements.
Does this calculate the full installed cost?
It estimates material cost from the entered unit price. Labor, reinforcement, forms, delivery, pumping, taxes and site preparation may be extra.