`C = sqrt( "A" /pi)* 2 * pi`

Enter a value for all fields

The Circular Slab Circumference from Area  Circular Concrete Slabequation computes the perimeter (circumference) of a circular slab base on the radius (r).

INSTRUCTIONS:  Enter the following:

• (r) Radius of Circular Slab.  Note: the radius is simply half the diameter.

Circular Slab Circumference (C): The calculator returns the circumference in feet.  However, this can be automatically converted to compatible units via the pull-down menu.

The Math / Science

If you know the area that you want in circular slab (e.g. 100 square feet), but don't know the length of perimeter for the forms material.  This calculator will tell you that length.  Just enter the area (A) and the calculator will compute the length of the outer perimeter.

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Circular Concrete Slab Calculators

• Rebar in Circular Slab: Computes the length and weight of rebar in a circular slab based on the dimensions, spacing, number of mats, rebar size, rebar stick length and lapping factor.
• Circular Slab Surface Area: Computes the surface area of a circular slab based on the diameter.
• Circular Slab Circumference: Computes the perimeter (circumference) of a circular slab base on the diameter.
• Volume of Circular Slab: Computes the cubic yards (volume) of concrete a circular slab based on the diameter and depth.
• Circular Slab Weight: Computes weight of a circular slab of concrete based on the diameter, depth and the mean density of concrete.
• Circular Slab Circumference from Area: Computes the circumference of a circular slab based on the surface area of the slab.
• Semi-circle Slab Volume: Computes the volume of concrete in a semicircular shaped slab based on the radius and the depth.
• Semi-Circle Slab Weight: Computes the weight or mass of a semicircular shaped concrete slab based on the radius, the depth and mean density of concrete.