Less-than-truckload shipping costs depend on more than the distance a shipment travels. The type of commodity, its weight, dimensions, packaging, handling requirements, and potential risks can all influence how a carrier prices and processes the freight. The National Motor Freight Classification system organizes these variables into a standardized framework that helps shippers and carriers communicate consistently.

Finding the correct National Motor Freight Classification codes can lead to more accurate LTL quotes, fewer reclassification fees, smoother carrier pickups, and faster freight movement. However, selecting a code based only on a general product name can result in costly errors. Shippers must understand how the commodity is packaged, how much space it occupies, and whether any special handling or liability concerns apply.

What Is the National Motor Freight Classification System?

The National Motor Freight Classification, commonly referred to as the NMFC, is a standardized system used to identify and classify commodities transported through less-than-truckload networks. It provides a common language that allows carriers, shippers, third-party logistics providers, and freight brokers to evaluate the transportation characteristics of different products.

The system is maintained by the National Motor Freight Traffic Association, or NMFTA. Commodities are assigned to one of 18 freight classes ranging from class 50 to class 500. Lower classes generally apply to dense, durable freight that is easy to handle and efficiently fills trailer space. Higher classes typically apply to freight that is lightweight, bulky, fragile, difficult to handle, or associated with greater liability.

The NMFC system is primarily used for LTL shipping because multiple shippers’ freight may share the same trailer. Carriers need a consistent method for evaluating how much trailer capacity each shipment consumes, how easily it can be moved, and what risks it presents during transportation.

What Are National Motor Freight Classification Codes?

National Motor Freight Classification codes, also called NMFC item numbers, are numerical identifiers connected to specific commodities or groups of commodities. An NMFC item number is generally five or six digits and may include subprovisions that account for density, packaging, materials, construction, or other transportation characteristics.

The NMFC code and the freight class are related, but they are not the same thing:

• The NMFC code identifies the commodity or commodity category.
• The freight class indicates how that commodity is rated for LTL transportation.
• An NMFC item may have one fixed freight class or several possible classes based on shipment density.
• Special provisions may apply when a commodity presents unusual handling, stowability, or liability concerns.

For example, two shipments may contain similar products but receive different classes because one shipment is densely packed on a standard pallet while the other occupies substantially more trailer space. That is why selecting a broad product description without reviewing the complete NMFC item is not always sufficient.

The Four Factors Used to Determine Freight Class

The National Motor Freight Classification evaluates freight according to four principal transportation characteristics: density, stowability, handling, and liability. Together, these characteristics describe how efficiently and safely a commodity can move through an LTL network.

Density

Density measures how much a shipment weighs relative to the amount of space it occupies. It is generally expressed in pounds per cubic foot.

A dense pallet of metal components uses trailer space more efficiently than a large pallet of lightweight plastic products. As a result, dense freight often receives a lower class, while low-density freight may receive a higher class.

Density has become even more important under the NMFC changes that took effect on July 19, 2025. Thousands of commodity listings transitioned toward a standardized, density-based classification structure, although handling, stowability, and liability considerations continue to affect certain items.

Stowability

Stowability refers to how easily a shipment can be placed alongside other freight inside a trailer. Freight that is square, stable, stackable, and compatible with surrounding cargo is generally easier to stow.

A shipment may be less stowable when it:

• Has an unusual or irregular shape
• Cannot support freight stacked on top of it
• Contains hazardous or incompatible materials
• Has protruding components
• Requires substantial empty space around it
• Is too long or wide for conventional pallet positions

Poor stowability can increase the amount of trailer space the shipment consumes, even when its actual weight is relatively low.

Handling

Handling evaluates the level of effort required to move freight through terminals, loading docks, and trailers. Standard palletized freight that can be moved with a forklift generally presents fewer handling challenges than loose, fragile, top-heavy, oversized, or oddly shaped items.

Freight may receive special handling consideration when it requires:

• Manual loading or unloading
• Specialized lifting equipment
• Additional securement
• Careful orientation
• Multiple workers to move safely
• Protection from tipping, crushing, or impact

The more time and labor required to handle a shipment, the more likely it is to receive a higher classification or special designation.

Liability

Liability reflects the likelihood that freight will be damaged, stolen, cause damage to other cargo, or create another transportation risk. Products that are fragile, hazardous, perishable, highly valuable, or attractive to thieves may present greater liability.

Liability considerations can include:

• The value of the commodity
• Susceptibility to theft
• Fragility or sensitivity
• Risk of leaking or contaminating other freight
• Hazardous-material characteristics
• Possibility of damaging nearby shipments
• Likelihood of spoilage or deterioration

Even a dense product may not qualify for a low class when it presents substantial handling, stowability, or liability concerns.

Understanding the 18 NMFC Freight Classes

The National Motor Freight Classification system includes 18 classes:

50, 55, 60, 65, 70, 77.5, 85, 92.5, 100, 110, 125, 150, 175, 200, 250, 300, 400, and 500.

These classes form a scale that reflects the relative transportability of a commodity. In general, freight becomes more expensive to move as the class increases, although actual LTL pricing also depends on factors such as mileage, carrier capacity, shipment weight, accessorial services, fuel costs, and negotiated rates.

A simplified breakdown may look like this:

Classes 50–70: Low-Class Freight

These classes generally include dense, durable products that can be efficiently stacked and handled. Examples may include bricks, steel components, tightly packed fasteners, machinery parts, and other heavy commodities with a small cubic footprint.

Classes 77.5–110: Medium-Low-Class Freight

This range often includes boxed commercial goods, automotive components, tires, engines, packaged food products, and other relatively manageable freight with moderate density.

Classes 125–200: Medium-High-Class Freight

Products in this range are frequently lighter, bulkier, more fragile, or less efficient to stack. Examples may include small appliances, furniture, cabinets, packaged clothing, and some consumer products.

Classes 250–500: High-Class Freight

The highest classes are commonly associated with very lightweight, bulky, fragile, unusually shaped, or high-liability goods. Fine art, delicate electronics, lightweight recreational products, and large shipments with substantial empty space may fall within these classifications.

These examples are only general illustrations. A commodity’s official NMFC item, packaging, density, and applicable subprovision must be reviewed before assigning a class.

How to Find the Correct National Motor Freight Classification Codes

Finding the correct code requires a systematic process. The following steps can help shippers classify freight more accurately before requesting an LTL quote or preparing shipping documents.

Step 1: Identify the Commodity as Specifically as Possible

Begin by documenting exactly what is being shipped. Avoid generic descriptions such as “parts,” “equipment,” “supplies,” “merchandise,” or “general freight.”

Instead, record details such as:

• The specific product name
• The material from which it is made
• Its intended use
• Whether it is new, used, assembled, or disassembled
• Whether it contains liquids, batteries, chemicals, or electronics
• Whether it is fragile, hazardous, temperature-sensitive, or high-value

For example, “automotive parts” may be too broad to locate the right item. A more precise description such as “steel automotive brake rotors on a pallet” provides more useful classification information.

Step 2: Document the Packaging Method

The same commodity may be classified differently depending on how it is prepared for transportation. Determine whether the product is shipping in boxes, crates, drums, bags, bundles, racks, reels, or another type of package.

Document whether the shipment is:

• Palletized or loose
• Fully enclosed or exposed
• Stackable or non-stackable
• Strapped, banded, wrapped, or crated
• Protected with internal cushioning
• Compliant with any packaging requirements listed in the NMFC

Packaging can affect handling, stowability, damage risk, and the applicability of a particular NMFC description.

Step 3: Weigh the Complete Shipping Unit

Use the total shipping weight, including the commodity, pallet, crate, box, wrapping, and other packaging materials. Do not rely solely on the product’s catalog weight.

Whenever possible, use a calibrated scale. Estimated weights can produce an incorrect density calculation and may lead to a carrier reweigh or invoice adjustment.

Step 4: Measure the Freight at Its Greatest Points

Measure the shipment’s final packaged dimensions after it has been palletized, wrapped, crated, or otherwise prepared for pickup. Record the longest length, widest width, and tallest height.

Include anything that extends beyond the main package, such as:

• Pallet overhang
• Bulging cartons
• Protruding components
• Protective framework
• Straps or supports that affect the exterior dimensions

Rounding dimensions down can make the shipment appear denser than it actually is. Carriers may use dimensioning equipment to verify the shipment’s true cubic footprint.

Step 5: Calculate the Shipment’s Density

Density is calculated by dividing the total shipment weight by its cubic volume.

First, calculate cubic feet:

Length × width × height in inches ÷ 1,728 = cubic feet

Then calculate density:

Total weight in pounds ÷ cubic feet = pounds per cubic foot

For example, consider a pallet that measures 48 inches long, 40 inches wide, and 48 inches high and weighs 600 pounds.

1. Multiply the dimensions: 48 × 40 × 48 = 92,160 cubic inches
2. Divide by 1,728: 92,160 ÷ 1,728 = 53.33 cubic feet
3. Divide weight by volume: 600 ÷ 53.33 = approximately 11.25 pounds per cubic foot

The calculated density can then be compared with the subprovisions listed under the applicable NMFC item.

Density should be calculated for the complete handling unit, not merely the product inside its packaging.

Step 6: Search the Official NMFC Database

Use NMFTA’s current ClassIT+ platform to search for the commodity by its specific name, material, function, or other relevant characteristics. ClassIT+ is the official digital NMFC classification tool and contains current item descriptions, classes, packaging references, rules, and related classification information.

Avoid selecting the first result simply because its wording appears similar. Review:

• The complete commodity description
• Included and excluded products
• Packaging requirements
• Referenced rules and notes
• Density-based subprovisions
• Handling, stowability, or liability designations
• The effective date of the classification

The correct result must accurately describe both the commodity and the way it is prepared for shipment.

Step 7: Select the Applicable Subprovision

Some NMFC items contain multiple subprovisions. These may assign different freight classes according to density or another qualifying characteristic.

After locating the likely item number, determine which subprovision applies to the shipment’s actual density, packaging, or transportation profile. Do not enter only the main item number when the classification requires a more specific subprovision.

The NMFC underwent substantial changes that became effective on July 19, 2025, including wider use of a standardized density-based approach, modernized commodity listings, and identifiers for freight with special handling, stowability, or liability concerns. Previously stored codes and classes should therefore be rechecked rather than assumed to remain valid.

Step 8: Confirm Carrier-Specific Requirements

Once the appropriate NMFC item and freight class have been identified, review the selected carrier’s tariff, rules, and customer pricing agreement.

A carrier may apply:

• Contract-specific freight-all-kinds rates
• Minimum charges
• Cubic-capacity rules
• Density-based pricing
• Oversize or excessive-length fees
• Non-stackable charges
• Limited-access fees
• Additional handling charges

The National Motor Freight Classification provides the industry baseline, but the carrier’s tariff and the shipper’s negotiated agreement ultimately help determine the final charge.

Step 9: Enter Consistent Information on Every Document

The commodity description, NMFC item number, subprovision, freight class, weight, dimensions, package count, and packaging type should be consistent across the quote request, bill of lading, shipping labels, warehouse records, and transportation management system.

Conflicting information can trigger manual review, reclassification, or billing delays.

A detailed bill of lading description might include:

• Specific commodity name
• NMFC item number and applicable subprovision
• Freight class
• Number and type of handling units
• Total weight
• Dimensions
• Hazardous-material information, when applicable

Clear shipment data gives the carrier a more complete operational picture before the freight enters the network.

Step 10: Request Expert Guidance When the Classification Is Unclear

Some products fit more than one possible description, combine multiple materials, or have unusual packaging and liability characteristics. In these situations, avoid guessing.

NMFTA offers classification interpretation assistance that can provide an expert opinion on the applicable item number, official commodity description, relevant rules, and packaging considerations.

A knowledgeable logistics provider can also help gather the shipment details, compare possible classifications, communicate with carriers, and maintain accurate product records.

How Accurate Classing Speeds Up LTL Shipments

Correct classification does more than improve the accuracy of a freight quote. It can reduce operational interruptions throughout the LTL shipping process.

When freight arrives at a carrier terminal with incomplete or questionable information, the carrier may need to inspect, reweigh, remeasure, or research the shipment before moving it forward. The shipment could be held while employees verify its dimensions, commodity description, packaging, or freight class.

Accurate National Motor Freight Classification codes help speed up shipments by allowing carriers to:

• Plan trailer capacity more effectively
• Assign appropriate handling equipment
• Identify non-stackable or sensitive cargo in advance
• Reduce manual classification reviews
• Process freight through terminals more efficiently
• Prepare accurate linehaul and delivery plans
• Minimize disputes that interrupt billing or release procedures

The correct code also helps the carrier understand whether the freight requires special placement, additional protection, restricted stacking, or separation from other cargo. NMFTA specifically identifies faster and more efficient delivery, safer handling, and fewer billing surprises as benefits of accurate classification.

In contrast, an incorrect class may cause a shipment to be pulled aside for review or moved after it has already been loaded. Accurate data helps freight proceed through the carrier’s network with fewer avoidable touches and fewer exceptions.

Simplify LTL Classification With Forefront Global Logistics

At Forefront Global Logistics, we provide end-to-end logistics management solutions designed to decrease costs and keep supply chains moving with speed, precision, and reliability. Our team helps businesses coordinate complex transportation requirements, improve shipment visibility, communicate with carriers, and reduce preventable freight disruptions.

We provide dependable logistics management services for fresh and frozen goods, consumer and retail products, healthcare and pharmaceuticals, automotive freight, technology, energy, industrial and aerospace commodities, and marble and granite. 

Our capabilities include Road Freight, LTL Shipping, Drayage Services, Intermodal Transportation, Ocean Freight, Air Freight, Warehousing Logistics, and Expedited & Hotshot Freight. Whether a business needs routine LTL support or a coordinated multimodal strategy, we work to create a more efficient and dependable logistics process.

Partner With Forefront Global Logistics for Smarter Freight Management

The correct National Motor Freight Classification can make the difference between a predictable LTL shipment and one affected by higher charges, classification disputes, or avoidable delays. By identifying the exact commodity, recording accurate weights and dimensions, calculating density, reviewing the complete NMFC item, and documenting the shipment properly, businesses can improve both pricing accuracy and transportation efficiency.

Forefront Global Logistics can help you navigate National Motor Freight Classification codes and build an LTL shipping strategy that keeps your freight moving efficiently. 

Contact Forefront Global Logistics today to learn more about our transportation and end-to-end logistics management solutions.

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