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`nb = ( "length" * "width" * "depth" )/ (0.3 ft^3)`

Enter a value for all fields

The **40lb bags of Concrete in a Slab** calculator computes the number of 40 pound bags of concrete needed for a rectangle (square) slab. The value is function of the surface area (length * width), and the depth.

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

- (
**L**) Length of the slab - (
**W**) Width of the slab - (
**D**) Depth of the slab

**40 pound bags of Concrete (nb):** The calculator returns the number of 40lb bags needed for the slab.

The volume of an 40lb bag of concrete is approximately 0.45 ft^{3}. This calculator computes the volume of the slab in cubic feet and then divides by the cubic feet in an 40lb bag

`nb = (L*W*D) / (0.3 ft^3)`

where:

- nb = number of 40lb bags
- L = length of slab
- W = width of slab
- D = depth of slab

**Cubic Yards in a Rectangle Slab:**This computes the volume of concrete in a rectangular shaped slab.**Volume of a Polygon Slab****Square Feet of a Rectangle Slab:**This computes the surface area of rectangular shaped slab.**Length of Rebar in a Rectangle Slab:**Computes the length of rebar in a rectangular shaped slab.**Weight of Rebar in a Rectangle Slab:**Computes the weight of rebar in a rectangular shaped slab.**Weight of Concrete by Cubic Yards:**This computes the weight of any volume of concrete.**Weight of Concrete and Rebar in a Slab**

- Cubic Yards of Concrete in a Slab
- 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 40lb 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