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:
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.
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)`