You aslo need to know the density of the matter being calculated.
multiply the density by the volume to get the weight
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There is no direct relationship between the volume (length*breadth*height) and weight. A given volume of air and the same volume of lead will have ver different weights.
The answer depends on what information you are given: (volume, breadth and height), (surface are, breadth and height), (principle diagonal, breadth and height), (mass, density, breadth and height) or some other set.
Length will equal the volume divided by the other two numbers.
Since the length and breadth are not given, the length of the diagonal can be anything from the smallest fraction to the largest number of units.
Cubic inches in a box = volume of box (in cubic inches) = Length * Breadth * Height, where each of these three is given in inches.