Circular Concrete Calculator
Estimate concrete for round patios, pads, fire pits, or Sonotube footings. Instant volume and bag calculation.
Frequently Asked Questions
How do you calculate concrete for a circle?
Use the formula pi times radius squared times thickness. For a 10 ft diameter by 4 in slab this works out to about 0.97 cubic yards.
How much concrete for a round fire pit pad?
A 6 ft diameter by 4 in pad requires about 0.35 cubic yards or 14 bags of 80 lb concrete.
What thickness for a circular patio?
4 inches is standard. Add wire mesh for crack prevention on diameters over 8 feet.
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