Same product. Same weight. Different freight class.
A 500-pound pallet that measures 48 inches high can fall into Class 100 under the standard NMFC density scale. Ship the same weight on a 36-inch-high pallet, and the calculation can put it in Class 85.
That does not guarantee a lower freight bill, but it shows why packaging dimensions matter more for many less-than-truckload (LTL) shipments.
Since the 2025 overhaul of the National Motor Freight Classification (NMFC), shippers have also had to keep up with additional classification changes. Another update, Docket 2026-2, is scheduled to take effect on December 12, 2026.
If your team has not reviewed its freight classes since last year, now is a good time to check the data behind your LTL quotes and invoices.
What Changed in the NMFC, and What Is Changing Again?
On July 19, 2025, the National Motor Freight Traffic Association (NMFTA) implemented a major update that moved more than 2,000 items toward full density-based classification. The standardized scale expanded from 11 to 13 density subprovisions.
Density became the primary factor for many eligible commodities, but it did not become the only consideration for every item. Handling, stowability, liability and applicable packaging provisions still matter. Some commodities retain classifications that cannot be determined from density alone.
NMFTA subsequently implemented the Docket 2026-1 update on May 23, 2026.
The next scheduled milestones are:
November 12, 2026: Publication of Supplement 2026-2.
December 12, 2026: Supplement 2026-2 takes effect.
January 24, 2027: The 2027 NMFC book takes effect.
Not every proposal in Docket 2026-2 was approved. Some items were moved toward full-scale density classification, while changes affecting certain hard-to-handle products did not proceed.
Shippers should consult the approved disposition and the applicable current classification rather than assuming every proposed change becomes effective.
How to Calculate LTL Freight Density Correctly
For a standard rectangular handling unit measured in inches, the basic calculation is:
Cubic feet = length × width × height ÷ 1,728
Density (pounds per cubic foot) = total shipping weight ÷ cubic feet
Use the dimensions and weight of the freight as shipped, including pallets, cartons, wrapping and other packaging.
The largest dimensions of the complete handling unit matter, not just the product dimensions in an inventory system.
A practical example: Same 500 pounds, different class
| Measurement | Original pallet | Repacked pallet |
|---|---|---|
| Dimensions | 48 × 40 × 48 in | 48 × 40 × 36 in |
| Total weight | 500 lb | 500 lb |
| Volume | 53.3 cu ft | 40.0 cu ft |
| Density | 9.4 lb/cu ft | 12.5 lb/cu ft |
| Standard density class | Class 100 | Class 85 |
The first pallet falls in the standard 8-to-under-10-pounds-per-cubic-foot range, or Class 100.
The second falls in the 12-to-under-15 range, or Class 85.
Important: This example applies only when the commodity is eligible for the standard 13-subprovision density scale and no other classification provision changes the result.
Verify the current NMFC item and the carrier's tariff before using a calculated class in a shipment quote.
Four Reasons LTL Shippers Face Unexpected Reclassification Charges
1. Outdated NMFC item numbers
An ERP, warehouse system or transportation management system may still populate bills of lading with item numbers or classes copied from older templates.
If an item has been revised or canceled, the information on the shipping documents may no longer match the applicable classification.
Review recurring commodities in NMFTA's ClassIT+ system, and update the master records used for quotes and bills of lading.
2. Density based on product specifications instead of the packed pallet
A product may be compact inside its carton, but the pallet carrying it can be much larger.
Empty space, loose stacking, protective corners and pallet overhang all affect the handling unit's measured dimensions.
Carriers using dimensioning and weighing equipment may record measurements different from those printed on the bill of lading.
Where that difference affects the applicable rating, a reweigh or reclassification adjustment may follow.
3. Mixed pallets classified incorrectly
Mixed freight remains an important exception to any simple density-only approach.
Under NMFC Item 640, differently classed articles consolidated on one handling unit can be charged at the highest applicable class, subject to the rule's itemization provisions and other exceptions.
Correctly identifying and documenting the individual articles can be important.
NMFTA considered rewriting Rule 640 in Docket 2026-2, but the proposal was not approved.
The existing provisions therefore remain in place.
Shippers using mixed pallets should check the actual rule, their documentation practices and any applicable carrier-specific tariff terms rather than applying one blended density class automatically.
4. No review after NMFC updates
NMFC data updates follow a twice-yearly cycle. An item that was checked during the 2025 transition may still need to be reviewed against the 2026 supplements.
Assign a specific person or team to monitor the docket calendar and confirm whether commonly shipped items are affected.
A freight class audit should be recurring maintenance, not a one-time migration project.
Why Freight Class Errors Matter Even More When LTL Rates Are Rising
Classification is only one component of LTL pricing, but the wider rate environment raises the cost of getting the details wrong.
In 2026, Old Dominion announced a 4.9% general rate increase effective October 5. ArcBest implemented a 5.9% increase in June, and Saia implemented a 7.1% increase in July.
These are published general rate increases, not promises that every customer's invoice rose by those exact percentages.
Actual LTL charges also reflect lanes, negotiated discounts, minimum charges, weight brackets, fuel surcharge arrangements and accessorial services.
That is why the right comparison is the all-in cost of the shipment, not just the class shown on a freight calculator.
If you regularly move several pallets on the same lanes, compare the full LTL quote with partial truckload and, where appropriate, full truckload alternatives.
The best option may change with shipment volume, freight characteristics and the rate environment.
An Eight-Step LTL Classification Audit for Shippers
1. Start with your highest-spend commodities. Pull your top 50 SKUs or other frequently shipped items by LTL transportation spend. Focus first on products that generate repeated adjustments.
2. Measure each handling unit as it actually ships. Record total weight, length, width and height, including the pallet and all packaging. Do not substitute catalog dimensions.
3. Verify the current NMFC item. Use ClassIT+ or another authoritative classification resource to determine whether each commodity follows the standard density scale or special provisions.
4. Review mixed-pallet documentation. Check how individual commodities, weights and classes are described on the bill of lading, particularly where Item 640 may apply.
5. Correct shipping master data. Update item numbers, dimensions, weights and classes in the systems that produce your quotes, labels and shipping documents.
6. Audit recent freight invoices. Review the previous 90 days for reclassification, reweigh and dimension adjustments. Request the carrier's measurements and supporting details when needed, and challenge discrepancies within applicable time limits.
7. Test packaging improvements safely. Look for opportunities to reduce unnecessary carton height or void space without compromising product protection, stacking stability or carrier packaging requirements.
8. Build the next update into your workflow. Review the November 12 supplement before the December 12 effective date, and recheck affected items against current published rules when the update takes effect.
Questions to Ask Your LTL Provider
Which of our regularly shipped items are density-rated under the current NMFC?
Can you share the dimensions and weights recorded for recent shipments that were reclassified?
How are mixed pallets rated, and what itemization does your tariff require?
Which minimum charges, accessorial fees or fuel tables changed with your latest rate update?
For our recurring multi-pallet lanes, would LTL consolidation or a partial truckload offer a better all-in cost?
A useful provider conversation should identify specific SKUs, shipping practices and lanes that deserve attention, rather than relying on a general statement that rates have increased.
Frequently Asked Questions
Does the NMFC classify every LTL shipment by density now?
No. More commodities use full density-based classification after the 2025 overhaul, but some items still have specific provisions based on handling, stowability, liability or packaging. The correct NMFC item matters.
How is pounds per cubic foot calculated for LTL freight?
Multiply the shipped handling unit's length, width and height in inches, divide by 1,728 to get cubic feet, and divide its total weight in pounds by that volume. Include the pallet and packaging in the measurements.
When does Docket 2026-2 take effect?
NMFTA currently schedules Supplement 2026-2 for publication on November 12, 2026, with an effective date of December 12, 2026. Check the published supplement for the final applicable provisions.
Can an LTL reclassification charge be disputed?
Potentially. Ask for the carrier's reweigh or dimensioning record, compare it with the shipping documents and applicable NMFC item, and review the carrier's tariff and dispute requirements.
An unexpected adjustment is not automatically incorrect.
The Bottom Line
For LTL shippers, freight class now depends more directly on packaging and shipping-unit dimensions for many products, while the underlying classification continues to evolve.
The practical response is straightforward: measure what you actually ship, verify the applicable NMFC item, document mixed freight correctly and audit the invoices that do not match expectations.
Do those things consistently, and you will be in a stronger position to spot avoidable classification errors and compare transportation options on a reliable basis.
How Varstar Alliance Can Help
Varstar Alliance works with shippers across the U.S. and Canada on LTL, truckload and cross-border transportation.
If you are reviewing unexpected LTL charges, or want to compare the options for your recurring freight, our team can help discuss your lanes, shipment characteristics and available transportation solutions.
Talk to the Varstar team about your freight.
Related Reading
Sources
This article provides general information and is not an official freight classification determination or legal or financial advice. NMFC rules, carrier tariffs, rates and effective dates may change. Verify the current item classification and applicable carrier terms before shipping.