Circular Concrete Slab Calculator
Estimate concrete volume, full bag quantity, round surface area, circumference, placed weight and cost for one or more circular slabs.
Default project preview
2.73 yd³
Concrete bags
123
Base volume
2.48 yd³
Round surface area
201.1 ft²
Edge circumference
50.3 ft
Calculator
Build the material order
Your order will appear here
Enter the project details and calculate a rounded material estimate.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Area = π × radius² × quantity. Concrete volume = area × thickness. Waste is applied before converting to ready-mix volume or rounding bags up.
FAQ
Circular Concrete Slab Calculator questions
Should diameter be measured to the form interior?+
Yes. Use the intended finished concrete diameter inside the form.
Does this include a thickened edge?+
No. It assumes one uniform slab thickness across the full circle.
Can this calculate a circular footing?+
It estimates volume, but structural footing dimensions and reinforcement require an approved design.