- 1). Fill the cardboard box with the dry substance. Once the substance is in the box level out the top with a ruler.
- 2). Measure the length, width and height of the material inside the box in inches. For example, the length might be 20 inches, the width 15 inches and the height 8 inches.
- 3). Multiply the length by the width by the height -- to get the volume of the material in cubic inches. Continuing the example, you have 20 inches multiplied by 15 inches and that multiplied by 8 inches, for a volume of 2,400 cubic inches.
- 4). Convert the volume to cubic feet by dividing this by 144, since a cubic foot contains 144 cubic inches. Performing this step, for the example, leads to 2,400 cubic inches divided by 144 cubic inches per cubic foot, for a volume of 16.7 cubic feet.
- 5). Multiply the weight density of the material, in pounds per cubic foot, by the volume -- to arrive at the dry weight in pounds. Completing the example, you have 100 pounds per cubic foot times 16.7 cubic feet, or a weight of 1,670 pounds.
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