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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 and water needed for a rectangle (square) slab.

**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 and the water required to mix it in gallons. However, this can be automatically converted to compatible units via the pull-down menu.

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
- 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