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`nb = (pi *( "r" )^2 * d )/(0.6 ft^3)`

Enter a value for all fields

The **Number of 80 pound bags of concreted for a Circular Slab** calculator computes the number of 80 pound bags of concrete needed for a circular slab* Circular Slab *

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

- (
**r**) Radius of the slab (half of the diameter) - (
**d**) Depth of the slab.

**Number of Bags (nb): **The calculator returns the number of 80 lb bags needed to fill the volume of the circular slab. It also returns the volume of concrete in cubic yards, the water requirement in gallons, the length of the perimeter and the surface area. Note, values with units can be automatically converted to compatible units via the pull-down menu.

- Cubic Yards of Concrete in a Slab
- Water Needed for Concrete
- How many 40lb bags of concrete for so many cubic yards of concrete.
- How many 60lb bags of concrete for so many cubic yards of concrete.
- How many 80lb bags of concrete for so many cubic yards of concrete.
- Price of a 40lb bag of concrete.
- Price of a 60lb bag of concrete.
- Price of a 80lb bag of concrete.
- How many 40lb bags of concrete needed for a slab.
- How many 60lb bags of concrete needed for a slab.
- How many 80lb bags of concrete needed for a slab.
- Cubic Feet of Concrete in a 40lb bag.
- Cubic Feet of Concrete in a 60lb bag.
- Cubic Feet of Concrete in a 80lb bag.
- Cubic Yards of Concrete in a Circular Slab.
- Number of 40lb bags needed for a Circular Slab
- Number of 60lb bags needed for a Circular Slab
- Number of 80lb bags needed for a Circular Slab