Circular Slab Concrete Calculator — m3, m2, m (volume, area, perimeter)

Calculate the concrete volume, surface area and circumference of a circular (round) slab. A 3 m diameter slab at 0.15 m thickness needs 1.06 m³ of concrete (7.07 m² area, 9.42 m circumference).

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Ø × h (m)Volume (m³)Area (m²)Perimeter (m)
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How to calculate circular slab volume

V = π/4 × D² × thickness. The area is π/4 × D²; multiply by thickness for volume.

Common mistake

Using π × D² (which is 4× too large). The circle area uses π/4 × diameter², or equivalently π × radius².

Rectangular slab calculator · Circumference calculator