If you haven't audited your LTL freight classifications since July 2025, you don't know what you're paying for. The NMFTA overhauled the National Motor Freight Classification system last summer, moving all non-specialized freight to a density-based scale. Carriers updated their systems the same week. Most mid-market shippers have not caught up.
This isn't a bureaucratic footnote. Historically, 15% of LTL shipments face reclassification at pickup or delivery. Under the new rules, carriers have explicit authority to reweigh and re-measure freight at the dock using automated dimensioning systems, and they will bill the corrected class before the load delivers. You find out on the invoice, not before.
Here's what changed, what it means for your freight budget, and what to do about it.
What the NMFC System Used to Do
The National Motor Freight Classification assigned freight classes to commodities using four factors: density, stowability, handling, and liability. A pallet of industrial safety products might be Class 100. A shipment of paper goods might be Class 85. The commodity description in the NMFC tariff told you which class applied, and that class drove your base LTL rate.
The system worked when freight moved in homogeneous loads. It created disputes when modern shippers began sending everything from lightweight plastic assemblies to dense metal components under the same contracts. The four-factor approach produced inconsistent classifications, repeated reclassification charges, and billing disputes that neither shippers nor carriers wanted to resolve one shipment at a time.
What Changed on July 19, 2025
NMFTA replaced the old 11-tier density scale with a 13-tier scale and moved over 2,000 commodity items to full density-based classification. For all non-specialized freight, commodity type no longer drives class. Density drives class. Period.
The new density-to-class scale works as follows:
| Density (lbs per cubic foot) | Freight Class |
|---|---|
| 50+ | Class 50 (lowest rate) |
| 35 to 50 | Class 55 |
| 30 to 35 | Class 60 |
| 22.5 to 30 | Class 65 |
| 15 to 22.5 | Class 70 |
| 13.5 to 15 | Class 85 |
| 12 to 13.5 | Class 92.5 |
| 10.5 to 12 | Class 100 |
| 9 to 10.5 | Class 110 |
| 8 to 9 | Class 125 |
| 7 to 8 | Class 150 |
| 6 to 7 | Class 175 |
| Under 6 | Class 200 to 500 (highest rates) |
To calculate your freight's density: multiply length by width by height in inches, divide by 1,728 to get cubic feet, then divide weight in pounds by cubic feet. You can run this instantly with our free freight density calculator. That number maps directly to a class above. If your declared class doesn't match that calculation, carriers will find the gap.
Measure the freight as it ships, packaged and on the pallet, not the bare product.
Two Ways This Change Hits Your Budget
The classification overhaul cuts both ways, and which direction you land depends on what you ship.
If you ship dense freight that was previously classified by commodity type at a higher class than its density warrants, you may have been overpaying. Reclassifying to a lower class means lower base rates. Some manufacturers shipping heavy machined parts, for example, found they were systematically overclassified under the old commodity rules.
If you ship bulky, lightweight freight that was previously classified at a moderate class because of favorable commodity descriptions, the new density math may push you up. Low-density freight, such as foam packaging, large plastic components, or assembled goods with significant air space, moves up the scale quickly. A shipment reclassified from Class 100 to Class 125 can carry a 20 to 35 percent rate premium on that shipment.
The average shipper-level impact across a full freight program tends to be modest, roughly 2 to 3 percent in either direction. But that average conceals individual lane and commodity mismatches that can be significant, and it doesn't account for the reclassification accessorial fees carriers charge when they catch discrepancies at the dock. Those fees stack on top of the corrected class rate.
Why Carriers Are Catching More Mismatches Than Before
Before automated dimensioning, reclassification happened when a dock worker eyeballed a load and flagged it. That was inconsistent and easy to dispute. Today, many LTL terminals run laser and camera arrays that capture actual pallet dimensions in seconds. If your bill of lading declares 48" x 40" x 48" and the freight actually measures 48" x 40" x 60", the system catches it before the truck leaves and bills the corrected class.
This matters because many shippers measure freight at the commodity level, not the packaged-and-palletized level. A product might be 10 lbs per cubic foot, but once it's in a corrugated box with packing material on a standard pallet, the true density including packaging is lower. If your classification is based on unpackaged product dimensions, you're filing the wrong density, and carriers' dimensioning systems are seeing the difference.
The Three Classification Errors Most Common Right Now
- Using legacy NMFC item numbers that no longer exist. NMFTA consolidated thousands of commodity listings. If your team is still selecting from a commodity library built before July 2025, those item numbers may have been merged, renumbered, or reclassified. Stale commodity libraries in order entry systems or TMS platforms are the most common source of systematic misclassification we see.
- Measuring product dimensions, not packaged and palletized dimensions. Density calculations must reflect the freight as it ships, including packaging. Measuring the product itself without accounting for corrugated, inner pack, and pallet configuration understates actual cubic footage, which shifts calculated density higher than reality. Carriers measure what's on the truck.
- Applying a single class to mixed-density pallets. When a pallet contains items of different densities, classification should reflect the predominant freight. Applying a blanket class to a mixed load invites reclassification on the outlier components, and carriers are not obligated to split the bill charitably.
How to Audit Your Freight Classifications Now
Start with your 20 highest-volume LTL commodity types by shipment count. For each one, run this process:
- Pull three to five representative shipments from the past 90 days. Get actual scale weights and measured dimensions at the packaged and palletized level, not product specifications.
- Calculate density for each: (weight in lbs) divided by (L x W x H in inches / 1,728).
- Map each density result to the 13-tier scale above. Compare the result to what your team is currently tendering.
- Flag any mismatch. A mismatch in either direction is a problem: overpaying means recoverable cost, underpaying means reclassification exposure.
After the commodity audit, run a six-month lookback on your LTL invoices. Pull every reclassification charge line and group by NMFC item or commodity description. Patterns in reclassification charges point to systemic classification errors in your order entry or carrier contract, not random carrier error. Random errors are isolated. Systematic errors repeat on every shipment of that commodity type.
If your freight program runs through a managed transportation provider or a TMS with a commodity library, that library needs to reflect the post-July 2025 density breakpoints. Ask your provider directly when they updated their classification data. If they don't have a clear answer, that's worth following up on.
The Long-Term Implication: Density Is Now a Design Input
Under the old commodity system, packaging decisions had limited impact on freight class. Under density-based classification, packaging is a rate driver.
Every cubic inch you eliminate through tighter packaging and every pound you add through denser consolidation moves your freight toward a lower class and a lower base rate. Companies that optimize carton dimensions relative to product weight will pay lower LTL rates than competitors shipping identical products in oversized boxes. The math compounds across thousands of shipments per year.
This creates a direct reason to involve packaging engineers in freight cost conversations, to right-size corrugated on high-volume SKUs, and to consolidate partial pallets into full ones rather than shipping low-density freight at Class 200 rates. For shippers running more than 500 LTL loads per month, even a one-class improvement on a meaningful portion of shipments produces six-figure annual savings before any carrier rate negotiation.
Where Managed Transportation Fits In
NMFC changes are not one-time events. NMFTA publishes tariff updates on a regular cycle, and staying current requires ongoing monitoring of those publications, regular commodity re-audits, and systematic invoice review to catch reclassification charges before they compound into a budget problem.
Most mid-market shippers don't have a dedicated freight classification resource. The audit described above is a few hours of work the first time, but maintaining it requires attention that usually falls between the logistics manager's primary responsibilities and the finance team's visibility.
FreightPlus manages freight classification as part of ongoing managed transportation for clients across manufacturing, food and beverage distribution, and packaging. We review classification on every load, monitor NMFTA publications for tariff changes, flag reclassification patterns on client invoices, and work with shippers to update commodity data when their product mix or packaging changes. Across the $300M+ in freight we manage annually, our audit process consistently finds classification errors and overcharges that clients weren't tracking internally. That audit discipline contributes directly to the 10 to 35 percent first-year cost reductions our clients typically see.
If you haven't reviewed your LTL freight classes since mid-2025, the classification audit is where to start. It costs a few hours. The savings, or the exposure you're carrying, are likely larger than you expect.