Freight Class and NMFC: Calculate Density Before LTL Pickup

Before pickup:

• Measure the outermost length, width, and height of the tendered unit, including pallet and overhang.
• Use gross packed weight, not product-only weight.
• Confirm the current NMFC item in ClassIT+; the July 19, 2025 update moved many items to a 13-band density scale.
• Put the accurate commodity description, NMFC item, class, pieces, dimensions, and weight on the BOL.
• Keep dated scale, tape-measure, label, and all-side freight photos.

Freight class is the rating; the NMFC item identifies the commodity

The National Motor Freight Classification is the North American LTL classification standard maintained by the National Motor Freight Traffic Association. It assigns classes from 50 to 500 using four transportation characteristics: density, handling, stowability, and liability.

The class number and NMFC item are not interchangeable. The item identifies the commodity and may point to one class, a density-based range, packaging rules, or special notes. Start with what the freight actually is, then apply the entry that matches how it is packed and tendered.

NMFTA's official NMFC overview directs shippers to ClassIT+ to identify the item, calculate density, and confirm class. A carrier tariff or contract may also contain pricing rules, so confirm the carrier's basis before treating an estimate as final.

Calculate density from the shipment the carrier will receive

1. Record gross packed weight in pounds, including pallet, crate, wrap, and dunnage.
2. Measure the longest outside length, width, and height in inches. Include overhang and protrusions.
3. Multiply the three dimensions to get cubic inches.
4. Divide cubic inches by 1,728 to get cubic feet.
5. Divide gross pounds by cubic feet to get pounds per cubic foot (PCF).

Worked example: A 48 × 40 × 60 inch pallet occupies 66.67 cubic feet. At 800 pounds, its density is 12.0 PCF. That density falls in the standard 12-to-less-than-15 PCF band, but the final class still depends on the correct NMFC item and its notes.

Round dimensions up consistently with the carrier's rules and never trim off pallet overhang in the worksheet. A two-inch measurement difference can move low-density freight across a band.

Use the current 13-band density scale—when the item calls for it

NMFTA's Docket 2025-1 changes took effect July 19, 2025. They expanded the standard full-density scale from 11 to 13 subprovisions and moved many commodities to density-based classification. The official NMFTA density-band FAQ lists the current breaks.

This table is not a universal class calculator. Items with unusual handling, stowability, or liability characteristics may not use the full-density scale. Hazardous, fragile, high-value, perishable, non-stackable, or excessively long freight can require different treatment.

Verify the item, BOL, and evidence before pickup

1. Search ClassIT+ with a specific commodity description rather than a broad label such as “electronics” or “furniture.”
2. Read the complete item, subprovision, packaging method, notes, and referenced rules.
3. Confirm that the density band uses the shipment's current packed measurements.
4. Ask the carrier or forwarder to confirm ambiguous, mixed-commodity, hazardous, fragile, or non-stackable freight in writing.
5. Make the BOL and quote match the verified item, class, description, count, dimensions, and weight.

The reclassification mistakes that cost the most

• Measuring cartons instead of the pallet: the carrier sees the outside shipping unit, including overhang.
• Using net product weight: pallets and protective material are part of gross tendered weight.
• Reusing an old item number: the 2025 NMFC changes consolidated and renumbered many items.
• Choosing class from density alone: special handling, stowability, and liability rules can override the standard scale.
• Writing a vague BOL description: the description should support the selected NMFC item.
• Keeping no pickup evidence: without measurements and photos, a later inspection is harder to evaluate or dispute.

Packaging can reduce both empty cube and handling risk. Use a pallet that fits the freight, eliminate unnecessary voids, prevent overhang, make the load stable, and disclose when it cannot be stacked. Do not compress or repack in a way that compromises the product or violates the applicable NMFC packaging rule.

Freight class and dimensional weight answer different questions

Freight class is an LTL classification input. Dimensional weight converts occupied volume into a billable weight, commonly in parcel, express, air, and some carrier-specific programs. A shipment can have an NMFC class and still be affected by a separate minimum-density, cubic-capacity, linear-foot, or dimensional rule in the carrier tariff.

Read the quote for the pricing method and accessorials. For parcel, air, or express math, use our volumetric-weight formula guide. For LTL, confirm the NMFC item and the carrier's governing tariff or contract rather than substituting a parcel divisor.

FAQ

What does NMFC mean in shipping?

NMFC means National Motor Freight Classification. It is the North American LTL standard that identifies commodities and assigns classes using density, handling, stowability, and liability.

How many freight classes are there?

There are 18 classes from 50 to 500. Lower numbers generally represent denser, easier-to-handle freight; higher numbers generally represent freight that is bulkier or presents greater handling, stowability, or liability concerns.

Where should I look up an NMFC code?

Use NMFTA's current ClassIT+ data and read the full item, subprovision, notes, and packaging requirements. Do not rely on an undated third-party chart for the commodity item.

Does density alone determine freight class?

No. Many items use the standard density scale, but the correct commodity item and its handling, stowability, liability, packaging, and special-rule provisions still control.

What should I do after a reclassification?

Compare the carrier inspection with your dated weight, dimensions, photographs, BOL, NMFC item, and applicable tariff. Ask for the inspection certificate and a written explanation, then submit the evidence through the carrier's billing-dispute process.