How Does The "Density Based" Setting Work?

Products from Eniture Technology that provide LTL freight quotes have a product-level setting for Freight Class that includes an option for "Density Based". How does it work?

If you use a product from Eniture Technology that provides LTL freight quotes, there will be a parameter for the product-level settings labeled "Freight Class."  We strongly advise that you correctly identify the correct Freight Class for the item.

Included in the Freight Class dropdown field is an option identified as "Density Based". Choosing this option will enable a formula that will calculate the freight class for the item based on its weight and dimensions.  The density calculation is an accepted industry-wide calculation. However, it is only one of four factors that determine the freight class of a commodity.

If you choose to select the Freight Class option "Density Based" from the dropdown, then you are accepting, at your own risk, the results of the calculation and are knowingly ignoring the other factors that influence the freight class of a commodity. If the other factors alter the result from the density-based calculation, then the shipping quotes obtained by the app/plugin will be inaccurate.

If you choose to select the Freight Class option "Density Based" from the dropdown, then you are accepting, at your own risk, the results of the calculation...

How to Calculate Cubic Density for LTL Freight

There are three calculations to perform:

  1. Multiply the dimensions of the commodity (length x width x height) measured in inches. The result is total cubic inches.
  2. Divide the total cubic inches calculated in Step 1 by 1,728 (the number of cubic inches in a cubic foot) to get the cubic volume expressed in feet.
  3. Divide the weight (in pounds) by the result of Step 2 to get the pounds per cubic foot, or "density."

You can use these three steps for individual items or for handling units such as a crate, pallet, or skid.

If you have an item that will ship as multiple packages, you can also use these three steps to determine the freight density. In Step 1, calculate the cubic volume (in inches) of each package and then add them together. In Step 3, divide the total weight of all the packages by the result of Step 2.

Lookup Freight Class By Cubic Density

Use the table below to identify the freight class corresponding to your item's cubic density. Remember that cubic density is only one of four factors in the classification system for freight and that the official resource is the NMFC directory. Be cautious if the freight density is on the edge of a class’s freight density range. For example, if the freight density is 34.995, you should call your LTL freight carrier to verify if you should use freight class 55 or 60. 


Freight Density
(in pounds per cubic foot)

Freight Class

Freight Density >= 50


35 <= Freight Density < 50


30 <= Freight Density < 35


22.5 <= Freight Density < 30


15 <= Freight Density < 22.5


13.5 <= Freight Density < 15


12 <= Freight Density < 13.5


10.5 <= Freight Density < 12


9 <= Freight Density < 10.5


8 <= Freight Density < 9


7 <= Freight Density < 8


6 <= Freight Density < 7


5 <= Freight Density < 6


4 <= Freight Density < 5


3 <= Freight Density < 4


2 <= Freight Density < 3


1 <= Freight Density < 2


Freight Density < 1



Related documents:

What is a freight class?

National Motor Freight Traffic Association (NMFTA)

ClassIT NMFC (Freight Class) directory registration form published by the NMFTA

Purchase a hard copy of the NMFC (Freight Class) directory from the NMFTA