worksheet
Density first, then the item
Pounds per cubic foot are arithmetic. The class still needs the classification item.
Cubic inches are length times width times height. Divide by 1,728 to get cubic feet. Divide the pounds by the cubic feet. That is density.
NMFTA's public 48 by 40 by 45 inch, 450 pound example is 9.00 pounds per cubic foot. A density band is not a class until the item's rules say so. Do not invent an item number. Live rating in this product is not ready, so practice on a worksheet.
The course that goes further is LTL. Reading this note does not enroll you.