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`nb = (pi *( "r" )^2 * d )/(0.3 ft^3)`

Enter a value for all fields

The **Number of 40 pound bags of concreted for a Circular Slab** calculator computes the number of 40 pound bags of concrete needed for a circular slab* Circular Slab *

**INSTRUCTIONS:** Choose units and enter the following:

- (
**r**) This is the radius of the slab (half of the diameter) - (
**d**) This is the depth of the slab.

**Number of Bags (nb): **The calculator returns the number of 40 lb bags needed to fill the volume of the circular slab.

**Related Calculators:**

- To compute the amount of rebar needed in a circular slab
- To compute the surface area of a circular concrete slab, CLICK HERE.
- To compute the perimeter or circumference of a circular concrete slab, CLICK HERE.

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