If you ship freight by less than truckload, one number does more to determine your cost than almost anything else: your freight class. It decides whether the same pallet moving between the same two cities costs a little or a lot, and getting it wrong can mean reclassification fees on top of a higher base rate. Understanding how freight class works, especially after the major changes that took effect in 2025, is one of the most practical ways to control your shipping costs.
What Freight Class Is
Freight class is a standardized rating system used to categorize less than truckload shipments. Every LTL shipment is assigned a class ranging from 50 to 500, where a lower class means a lower rate. The system is part of the National Motor Freight Classification, or NMFC, which is published by the National Motor Freight Traffic Association, a nonprofit standards body that has maintained the classification system for the LTL industry since 1956.
The purpose of the system is to give carriers and shippers a common language for pricing. Because many different shippers share space on the same LTL trailer, carriers need a consistent way to price freight based on how difficult and space-consuming it is to transport. Freight class is that common standard.
The Four Factors Behind a Freight Class
Traditionally, freight classification has been based on four transportation characteristics:
- Density. The weight of the freight relative to the space it occupies.
- Handling. How difficult the freight is to load, unload, and move.
- Stowability. How easily the freight fits alongside other cargo in a trailer.
- Liability. The risk of damage, theft, or the freight damaging other goods.
For most everyday commodities, density has become the dominant factor, and that shift is at the heart of the biggest change the system has seen in decades.
What Changed in 2025 and 2026
On July 19, 2025, the NMFTA implemented the most significant structural change to LTL freight classification in years, moving from a primarily commodity-based system to a primarily density-based one. Rather than classifying goods mainly by what they are, the updated system classifies most freight by how dense it is, measured in pounds per cubic foot. The change affected thousands of NMFC item numbers.
The reform did not stop there. A follow-up update, known as Docket 2026-1, took effect on February 6, 2026, canceling additional legacy items and further tightening the new structure. The practical takeaway for shippers is that any freight class determined under the old system may no longer be accurate, and classifications pulled from outdated tables can lead directly to billing errors.
The reason for the change is straightforward. Carriers want accurate data on how much space freight takes up, not just what the freight is, because space is what actually drives their costs. Density-based classification reflects how freight moves today more accurately than the older commodity-based approach.
How to Calculate Your Freight Density
Because density now drives classification for most freight, knowing how to calculate it is essential. The formula is simple:
First, measure the length, width, and height of your fully packaged shipment in inches, including the pallet and any overhang. Multiply those three dimensions together to get the total cubic inches, then divide by 1,728 to convert to cubic feet. Finally, divide the total weight of the shipment in pounds by the cubic feet. The result is your density in pounds per cubic foot.
As a general rule, denser freight falls into a lower class and ships at a lower rate, while light and bulky freight falls into a higher class and costs more. For the exact class that corresponds to a given density, and to confirm whether a specific commodity uses the density scale or retains a fixed class, the NMFTA maintains the authoritative lookup tool.
Why Getting It Right Matters to Your Invoice
Freight class is not just paperwork. It directly determines what you pay, and errors are expensive. If you declare the wrong class, the carrier reweighs and remeasures your shipment at the terminal, assigns the correct class, and re-bills you at the higher rate plus a reclassification fee. Repeated errors can even cost you negotiated discounts with a carrier.
Common mistakes include pulling a class from outdated commodity tables that no longer match the post-2025 items, ignoring overhang or oversize dimensions, and quoting a class once and never recalculating when packaging changes. Each of these can turn a clean quote into a surprise invoice.
The fix is consistent: calculate density before every booking, verify the NMFC code and class on your bill of lading, and recalculate whenever your packaging or dimensions change. For freight that also connects to an international move, it is worth planning your class alongside the other cost factors, since drayage and accessorial charges stack on top of your LTL rate.
Jade International helps clients classify LTL freight correctly as part of its domestic shipping services, and coordinates that domestic freight with import and ocean export shipments so cargo moves from port to final destination without unnecessary handoffs or billing surprises. If you want help making sure your freight is classified accurately before it ships, reach out to our team.
