The 80lb bags of Concrete in a Slab calculator computes the number of 80 pound bags of concrete needed for a rectangle (square) slab.
INSTRUCTIONS: Choose units and enter the following:
80 pound bags of Concrete (nb): The calculator returns the number of 80lb bags needed for the slab. The calculator also returns the equivalent volume in cubic yards, the the surface area of the slab in square feet, the linear feet of forms and the water required for the concrete mix.
Theis approximately 0.6 ft3. This calculator computes the in cubic feet and then divides by the cubic feet in an 80lb bag.
`nb = (L*W*D) / (0.6 ft^3)`