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:
40 pound bags of Concrete (nb): The calculator returns the number of 40lb bags needed for the slab.
Theis approximately 0.45 ft3. This calculator computes the in cubic feet and then divides by the
`nb = (L*W*D) / (0.3 ft^3)`