Easy guide to freight classifications and NMFC Codes.


This is a simple density freight class calculator. Enter your dimensions, weight and piece count and the calculator will do the rest. Need help? 888-363-7577

There are 18 different freight classes and over 18,000 NMFC Codes.

Freight Class Definition

Freight Class refers to the National Motor Freight Classification (NMFC) and it is the category of your freight as defined by the National Motor Freight Traffic Association (NMFTA)

In simplest terms the government stated there are specific codes you must use to calculate shipping costs based on dimensions, value and/or density. All freight carriers must use the same freight classes to calculate shipping charges.

1: There are 18 Freight Classes from Class 50 to Class 500

2: LTL shipments require a freight class to get pricing

3: Carriers have the right to inspect every shipment for errors

Are They Important to Know and Use?

If you fail to properly classify a shipment, you could get a rate adjustment from the carrier plus billing correction fees that may mean paying more for inaccurate details

1: Some freight classes are based on shipment value

2: Carrier inspections can be costly. Some charge a billing correction fee on top of the adjusted shipping cost

3: Never guess what your freight class is. Nope, no, never


NMFC Code Definition

In North America each commodity or type of freight is shipping is classified by the National Motor Freight Classification (NMFC) and has a corresponding freight class for all LTL (Less than truckload) shipping. This is a standardized method to help consumers receive a uniform price when transporting LTL Freight

1: Depending on commodity, there can be up to 11 sub classes of freight class

2: NMFC Codes are used to ensure proper packaging and density

3: Our shippers have access to all the NMFC Codes and Freight Classes as part of our award winning service

If you need help determining your freight class or NMFC Code, you can contact us: HERE or review the below for help determining freight class based on density only

Disclaimer and Further Help:

The information and tools on this page are intended to only be a resource to be used as a general guideline into the characteristics and attributes that are used by the National Motor Freight Traffic Association, Inc. in determining freight classes. The information and tools on this page are not in any way intended to be a calculator for determining the exact actual freight class of your commodities. The most truly accurate method to ensure the accurate determination of freight class is to utilize The National Motor Freight Classification® (NMFC®) which is published by the National Motor Freight Traffic Association, Inc. More information can be found on this at The National Motor Freight Traffic Association’s website (http://www.nmfta.org/pages/nmfc). The National Motor Freight Traffic Association also makes the full National Motor Freight Classification® (NMFC®) through an on-line tool called ClassIT® which is available for a fee (https://classit.nmfta.org/all/Welcome.aspx).

Failure to accurately determine the actual freight class of your items being shipped can result in significantly different and higher rating and carrier billings.