Let’s look at this example of a solid concrete box in need of rigging. The only information that we have is that is a concrete object. Using our knowledge of measuring, of volume calculation for boxes, and the weight of material chart per volume, we can figure out its weight, so that we can select the right rigging equipment. The first step is to calculate the volume of the box. We know that to calculate the volume we need to multiply length, times width, times height. After measuring the box with our tape measure we find that the length is 10 feet, the height is 8 feet, and the width is 6 feet. Multiplying all these values we get a volume of 480 cubic feet. We now look at the weight per volume for concrete on the chart, which is highlighted in yellow, and we see that the weight per volume is 144 pounds. We now need to multiply the volume of the box, times the weight per volume for concrete from the chart. That is 480 cubic feet, times 144 pounds per cubic feet. This calculation gives us a weight of 69,120 pounds.
