Freight Classification: A Comprehensive Guide to Pricing and Handling

The NMFC is published by the National Motor Freight Traffic Association (NMFTA). It rates each commodity on four characteristics: density, handling, stowability and liability. Since the July 19, 2025 changes, density is the primary factor, measured in pounds per cubic foot (pcf).

This guide covers the 18 classes, the density scale in use today, how to find your NMFC number and how to calculate density yourself. For the terms used here, see the Freight Glossary.

Key facts

What are the 18 freight classes?

The NMFC groups every commodity into one of 18 classes, from a low of class 50 to a high of class 500. Dense freight that is easy to handle and stow gets a low number. Light, bulky, fragile or hazardous freight gets a high number.

The standard density scale below uses 13 of these classes. The other five (77.5, 110, 150, 200 and 500) are not on that scale.

How does density-based freight classification work?

Under the NMFC density scale, your freight class comes from the density of each handling unit: the heavier the unit is for its size, the lower the class. NMFTA adopted this scale for a large group of items in Docket 2025-1, effective July 19, 2025.

The change expanded the old 11-step scale to 13 steps (subprovisions, or "subs"). The two new steps give class 55 to freight from 35 to less than 50 pcf and class 50 to freight of 50 pcf or more.

Density is not the whole story. NMFTA still requires the correct NMFC item number, because items with handling, stowability or liability concerns are not classed on density alone. In the NMFC these items carry a symbol that marks known handling, stowability or liability issues.

The class also reflects the shipment as you tender it. Box sizes, packaging and how you build the pallet all change the density, so the same product can land in a different class. Our guide to Packaging and Labeling covers how to pack freight for LTL.

What is the NMFC and who publishes it?

The National Motor Freight Classification (NMFC) is the standard that compares commodities moving in interstate, intrastate and foreign commerce and assigns each one an item number and a class. The National Motor Freight Traffic Association (NMFTA), based in Alexandria, Virginia, publishes and manages it.

• NMFTA is a membership-based nonprofit, not a government agency.
• The NMFC is a voluntary standard. Carriers, third-party logistics providers (3PLs) and shippers use it to assign class unless a carrier has published its own tariff.
• Changes go through the Freight Classification Development Center (FCDC). It publishes proposals in a public docket, discusses them at a public meeting and issues the results in a supplement.
• The NMFC is updated twice a year. Supplement 2026-2 is issued November 12, 2026 and takes effect December 12, 2026; the NMFC Book 2027 takes effect January 24, 2027.

How do I find my item's NMFC number?

Search the NMFC for the most specific description of your product, then check how that item sets its class. NMFTA's online version of the NMFC, ClassIT+, contains every item number and is sold as an annual subscription; the printed NMFC Book is sold per copy.

1. Describe the product precisely: what it is made of, what it is used for and how it is packed. Search ClassIT+ with specific words rather than a general category.
2. Open the matching item and read its notes and packaging requirements. Minimum packaging requirements are specific to each commodity description.
3. Check whether the item lists density subprovisions. If it does, measure and weigh each handling unit and find its sub on the item's scale.
4. Check for the handling, stowability and liability symbol. Those items are not classed on density alone.
5. Write the NMFC item number, sub and class on the bill of lading. Since December 6, 2025, NMFC Item 250100 requires the commodity description on the bill of lading to match the tariff, including the item number, sub provision and class.
6. If you are still unsure, NMFTA sells Classification Interpretation Assistance as a single inquiry or a block of five.

When you request a freight quote, give the description, NMFC item number if you have it, dimensions, weight and packaging of each handling unit, so the quote matches the freight you tender.

How do you calculate freight density?

Freight density is the weight of a handling unit divided by its volume in cubic feet. A handling unit is each piece the carrier handles separately, such as a loose box, a crate or a pallet that is shrink-wrapped or banded as one unit.

1. Measure the greatest length, width and height of the handling unit in inches, as tendered, including the pallet and anything that sticks out.
2. Multiply the three numbers to get cubic inches.
3. Divide by 1,728 (the cubic inches in one cubic foot) to get cubic feet.
4. Weigh the handling unit as tendered, pallet and packaging included, and divide the weight in pounds by the cubic feet. The result is the density in pounds per cubic foot (pcf).
5. Find that density on your NMFC item's scale to get the class.

Worked example: one pallet

NMFTA's own example is a pallet of boxes measuring 48 x 40 x 45 inches and weighing 450 lbs.

• 48 x 40 x 45 = 86,400 cubic inches
• 86,400 / 1,728 = 50 cubic feet
• 450 lbs / 50 cubic feet = 9.00 pcf

On an item that uses the standard 13-subprovision scale, 9.00 pcf falls in Sub 6 (8 but less than 10 pcf): class 100.

Same weight, taller pallet

Stack the same 450 lbs to 60 inches high and the pallet measures 48 x 40 x 60 inches: 115,200 cubic inches, or 66.67 cubic feet. The density drops to 6.75 pcf, which is Sub 5 (6 but less than 8 pcf): class 125. Empty space on a pallet raises the class, so build pallets as compact as your product allows.

Shipments with more than one handling unit

NMFC Item 110 calculates density on each handling unit separately. The exception: when the shipping papers show only a total weight for all handling units, density may be calculated from the total weight and the total cube. List each pallet's weight and dimensions on the bill of lading if you want each one rated on its own.

For a quick check, NMFTA offers a free LTL Freight Density Calculator. It returns density only; you still need the right NMFC item to read the class.

How does freight class affect LTL price?

In general, a lower freight class means a lower LTL rate and a higher class means a higher rate, because the class tells the carrier how hard the freight is to move. Class is one input to the price: weight, distance and extra services count too.

• The NMFC defines a class as the number used to find the applicable rate. Moving from class 125 to class 100, as in the example above, puts the shipment on a lower class.
• Carriers can publish their own tariffs and rules on top of the NMFC, so check how your carrier applies it.
• Services such as liftgate delivery or inside delivery are billed separately as accessorial charges. See Understanding Accessorial Charges.

For the other factors in a freight rate, read Factors Affecting Freight Shipping Rates. For freight that needs a whole trailer, compare Full Truckload (FTL) shipping.

What happens if your freight class is wrong?

If the carrier finds that your freight belongs in a higher class, it can reclassify the freight, and you may pay additional charges. NMFC Item 250100 gives carriers the right to inspect freight and to verify its weight and dimensions.

A wrong class can also bring clerical fees, chargebacks and delays. Common mistakes that lead to reclassification:

• Estimated weight or dimensions. NMFTA says to use measured numbers, never estimates.
• Leaving out the pallet or parts that stick out when you measure. The cube includes all projections.
• Using an old item number or class. Docket 2025-1 canceled many items and reestablished them under new numbers, so a class from an old bill of lading may be out of date.
• Using density alone for an item with the handling, stowability and liability symbol.
• A vague description on the bill of lading that does not match the NMFC item.

If you think a reclassification is wrong, collect your measurements, photos and the NMFC item you used, and follow the carrier's dispute process. The steps are in "Disputing Freight Classification" further down this guide. When you are ready to ship, see our Freight Shipping services or browse the rest of the Freight Shipping 101 lessons.

Freight Classification: Optimizing Pricing and Ensuring Proper Handling

Understanding freight classification is essential for streamlining operations and maximizing efficiency in the fast-paced world of shipping. Freight classification is essential for classifying products according to their characteristics and allowing firms to decide on the best pricing and handling needs for each shipment.

Why is freight classification important?

1. Pricing Optimization: Shipping expenses are directly impacted by freight categorization. Businesses may make sure they are charged the appropriate rates based on the characteristics of the commodity, such as size, weight, density, and fragility, by appropriately classifying items. With this information, shippers are better equipped to bargain for lower prices and prevent overpaying for shipping services.
2. Proper Handling: For the purpose of preventing damage during transit, different types of commodities require different handling techniques. The exact handling instructions and safety precautions needed for each item are identified with the aid of freight classification. The chance of accidents, breakages, or delays is significantly reduced with proper handling, which guarantees the safe and secure delivery of goods.
3. Efficiency and Accuracy: Businesses may streamline their logistics processes by knowing freight categorization. They are able to distribute resources effectively, choose the best carriers, and choose the right packaging. Better planning, shorter travel times, and more customer satisfaction all result from accurate classification.

We at Shipixy are aware of how important freight categorization is to the shipping sector. Our thorough glossary of freight classification words and meanings offers helpful insights into the fundamental ideas and lingo related to this crucial part of transportation. Whether you are an experienced shipper or a newcomer to the business, our guide attempts to arm you with the information you need to successfully negotiate the complexity of freight classification.

Keep reading as we go deeper into the key terminology and terms connected to freight classification to help you improve handling practices, optimize price, and achieve new levels of shipping performance.

What is Freight Classification?

A system called freight classification is employed in the shipping industry to classify goods according to various criteria. For diverse kinds of goods, it is crucial in choosing the right pricing, handling specifications, and transportation laws. For companies looking to streamline their shipping processes and guarantee effective delivery, understanding the notion of freight categorization is crucial.

Factors Considered in Freight Classification:

1. Size: When classifying the cargo, the length, width, and height of the cargo are taken into consideration. Larger goods could need special handling or transportation tools.
2. Weight: The cost and mode of transportation are directly influenced by the cargo's weight. Weightier objects may require specialized equipment or carriers that can handle the weight, which could result in greater shipping costs.
3. Density: Density, which describes how compact the cargo is, is determined by dividing the shipment's weight by its volume. It influences cost and handling needs by determining how much space the goods takes up in the transportation vehicle.
4. Handling Requirements: Due to their nature, fragility, or hazardous characteristics, some products require specific handling recommendations. These unique handling needs are taken into account while classifying freight to ensure secure transport and avoid damage or mishaps.

The Importance of Accurate Classification:

Accurate freight classification is crucial for efficient shipping operations. It enables businesses to:

• Establish the right price. By appropriately classifying cargo, shippers may make sure they are charged the correct rates depending on the unique characteristics of the items. This aids in negotiating reasonable prices and averting extra expenses.
• Effective resource allocation is made possible by accurate classification, which enables planning and resource allocation for enterprises. They can choose the proper packaging, identify carriers that can handle the cargo, and maximize the use of available space in transportation vehicles.
• Maintaining compliance with rules and constraints on transportation is made easier by freight categorization. Accurate classification assures compliance with any legal requirements that may be unique to a certain class of goods.

In conclusion, it is critical for companies that ship goods to understand freight categorization. It offers a well-organized framework for classifying cargo according to its size, weight, density, and handling needs. Accurate classification helps organizations meet transportation rules and maximizes cost and efficiency. Businesses may optimize their shipping processes and succeed more in the cutthroat world of logistics by understanding the notion of freight categorization.

The National Motor Freight Traffic Association (NMFTA)

By creating guidelines for freight categorization, the National Motor Freight Traffic Association (NMFTA) significantly contributes to the freight transportation sector. The NMFTA assigns distinctive designations to commodities through its National Motor Freight categorization (NMFC) system, simplifying rate calculation and guaranteeing consistency in categorization across the industry.

Introduction to the NMFTA:

The NMFTA is an industry association that governs freight transportation regulations and practices in the United States. It acts as a central authority for establishing guidelines and standards that carriers, shippers, and logistics providers adhere to for fair and consistent freight classification.

The National Motor Freight Classification (NMFC) System:

The NMFTA's NMFC system offers a thorough structure for allocating distinctive codes to various commodities kinds. These identifiers describe particular traits and properties of the items, making freight classification and costing precise.

Simplifying Rate Calculation:

The rate determination process for freight shipments is made easier by the NMFC system. Based on its features, including size, weight, density, and handling needs, each commodity is given a unique code. Carriers then consult the NMFC to establish the correct charge for shipping the products, taking into account things like service quality and distance. This uniform method simplifies the pricing procedure and guarantees accuracy in rate determination across the sector.

Consistency in Freight Classification:

The NMFTA promotes uniformity in freight categorization practices by utilizing the NMFC system. Commodities are given distinctive identifiers that help remove uncertainty and conflicts while identifying the correct classification for a shipment. By establishing clear criteria and lowering conflicts or misunderstandings surrounding freight categorization, consistency benefits both shippers and carriers.

Benefits of the NMFC System:

The NMFC system offers several benefits to businesses involved in freight shipping:

1. Clarity and Transparency: The NMFC codes assigned make it simpler for shippers and carriers to comprehend the precise classification by providing clear and transparent information about the traits and handling needs of commodities.
2. Cost Optimization: With a standardized classification system, businesses can accurately determine the shipping rates for their goods. This allows them to optimize costs by selecting the most efficient transportation options based on the assigned NMFC code.
3. Industry-wide Consistency: The NMFC system guarantees uniform freight classification across the sector, facilitating easy exchanges between shippers and carriers. The shipping procedure benefits from reliability and trust thanks to this regularity.

Conclusion: In the shipping sector, freight classification is determined in large part by the NMFTA and its NMFC system. The NMFTA makes rate calculation easier and guarantees industry-wide classification consistency by giving commodities special codes. Businesses are better equipped to negotiate the complexity of freight classification, reduce expenses, and guarantee effective delivery of their goods when they comprehend the NMFC system and its advantages.

Impact on Pricing and Handling

The way that items are handled and priced in the transportation sector are directly impacted by the way that freight is classified. Carriers base their pricing, which is dependent on classification, on the NMFC code given to a product. To save shipping costs and ensure that the products are handled with care, it is crucial to comprehend how classification affects pricing and handling needs.

Freight Classification and Pricing:

The NMFC code given to a commodity is very important in calculating how much shipment will cost. In order to classify the items and determine the proper rate for transportation, carriers use this code as a guide. Size, weight, density, and handling needs are only a few examples of the classification criteria.

Impact of Lower and Higher Classes:

Higher density and fewer handling needs for the cargo are indicated by lower freight classes. Carriers consequently assess cheaper rates for shipments categorized under lower classes. These goods don't need as much specialist handling because they can be efficiently packed, stacked, and delivered.

Higher freight classes, on the other hand, imply lower density and more specialized handling requirements. Higher-classed commodities take up more space and require special handling when being transported. In order to cover the greater complexity and resources needed to manage and deliver them, carriers charge higher charges for these goods.

Optimizing Pricing and Handling:

Businesses can reduce shipping costs and guarantee correct treatment of their products by optimizing shipping expenses by understanding the effects of freight classification on price and handling. Businesses can: By precisely identifying their commodities

1. Choose the Right Packaging: Knowing the classification helps businesses select the appropriate packaging materials and methods that comply with handling requirements. This ensures the goods are properly protected during transit, reducing the risk of damage and minimizing additional charges.
2. Evaluate Transportation Options: With knowledge of the freight class, businesses can compare pricing from different carriers and select the most cost-effective transportation option. They can negotiate rates based on accurate classification and explore alternative methods, such as intermodal shipping, to optimize costs.
3. Plan Inventory and Logistics: Freight classification provides insights into the space requirements and handling considerations for different commodities. Businesses can use this information to plan their inventory and logistics operations more efficiently, optimizing storage space and ensuring appropriate resources are allocated for handling.

Conclusion:

Freight classification significantly impacts pricing and handling in the shipping industry. Carriers use the NMFC code to determine pricing based on the classification assigned to a commodity. Lower classes indicate higher density and fewer handling requirements, resulting in lower rates, while higher classes imply lower density and more specialized handling needs, leading to higher rates. Understanding this relationship allows businesses to optimize their shipping costs, select appropriate packaging and transportation options, and ensure proper care of their goods throughout the shipping process.

Determining Freight Class

To ensure accurate pricing and appropriate handling, it is crucial to choose the relevant freight class for your shipments. There are a few procedures that shippers can take to classify their goods properly.

1. Understand the NMFC System: Learn about the NMFC (National Motor Freight Classification) system. This approach offers a consistent framework for classifying various commodities according to their traits and handling needs. Understanding the rules and regulations established in the NMFC system is crucial.
2. Review the NMFC Book: Consult the NMFC book for comprehensive details on the descriptions of commodities and freight classes. A detailed list of commodities, together with their respective NMFC numbers and descriptions, is provided in the book. You can find commodities that are similar to yours and learn about their related freight classes by consulting the NMFC book.
3. Seek Expert Advice: Consider speaking with professionals who specialize in freight classification if you are unsure of how to classify your items. These professionals have extensive knowledge and expertise in selecting the proper freight class based on the unique features of your goods. They can help you through it and make sure the classification is correct.
4. Utilize Online Tools: Utilize the tools and information available online to help you determine the freight class. There are numerous websites and software programs that offer classification support. You must frequently enter details about your shipments into these tools, like weight, size, density, and handling needs. The tools create the appropriate freight class for your items based on this data.
5. Consider Freight Class Calculators: On their websites, certain carriers and logistics providers include freight class calculators. You can enter the specifics of your shipments into these calculators, and they will calculate the appropriate freight class depending on the data you give. It is advisable to inquire about the availability of such instruments with your chosen carriers or logistics companies.
6. Accurate Documentation: Make sure your shipments are properly documented, with precise descriptions and specs. Give specific details regarding the dimensions, weight, density, and any special handling needs of your products. The right freight class for your goods can be determined by carriers and freight specialists with the use of accurate documentation.

Conclusion:

For precise pricing and appropriate handling, it is essential to identify the freight class of your goods. Learn about the NMFC system, read the NMFC book, consult an expert, use online tools and calculators, and make sure your shipments are properly documented in order to identify the correct categorization. You may reliably assign the proper freight class to your items and streamline the shipping process by following these procedures.

Disputing Freight Classification

You have the ability to contest the allocated freight class if you think it is improper for your shipment. In order to guarantee fair pricing and accurate treatment of your goods, you must contest the classification. Here is a description of the procedure and the actions you can take to contest the chosen freight class:

1. Review the Classification Basis: Review the criteria used to determine the freight class for your shipment very carefully. Verify that all pertinent criteria, including size, weight, density, and handling requirements, were properly taken into account. Find any inconsistencies or mistakes with the categorisation that was given.
2. Contact the Carrier: Contact the shipping company handling your package's delivery to voice your reservations about the designated freight class. Give them specifics about your shipment and let them know why you think the classification is inaccurate. Throughout the dispute process, it's crucial to keep the lines of communication open with the carrier.
3. Provide Supporting Evidence: Strong proof supporting your disagreement and your need for a change freight class should be provided. Documentation showing the errors in the assigned classification may include product specifications, industry standards, or any other pertinent data. Your case will be stronger if you can offer more meaningful evidence.
4. Seek Professional Assistance: Consult with business specialists or experts in freight classification if you run into difficulties or complexities during the dispute process. Due to their extensive knowledge of the classification system, these experts can offer direction and help while arguing against the allocated freight class. They can examine the particulars of your shipment and offer a qualified assessment of the proper classification.
5. Follow Carrier's Dispute Resolution Process: There may be a different dispute resolution procedure in effect for every carrier. Understand the carrier's policies and follow them when submitting your dispute. This could entail making a formal written request, supplying supporting materials, and having talks or negotiations with the carrier's officials.
6. Maintain Documentation: Keep thorough documentation of all your interactions, correspondence, and evidence related to the dispute. This documentation will be crucial in presenting your case effectively and ensuring a fair resolution.

Conclusion:

It's crucial to dispute the allocated freight class in order to guarantee appropriate pricing and careful management of your shipments. Review the categorization basis, get in touch with the carrier, offer proof, get expert help if necessary, and adhere to the carrier's dispute resolution procedure. You can successfully contest an inaccurate freight classification and work toward a just settlement by following these steps and maintaining thorough documentation.

Conclusion

The idea of freight classification and its importance in the shipping business have been covered in this guide. Businesses must understand freight categorization in order to optimize pricing and guarantee proper product handling. Let's review the main ideas raised:

1. Freight Classification Overview: Freight classification entails classifying cargo according to specifications for handling, size, weight, and density. An effective classification system is essential for smooth shipping operations.
2. The Role of NMFTA: The National Motor Freight Traffic Association (NMFTA) is important in the classification of freight. Through the National Motor Freight Classification (NMFC) system, the NMFTA allocates distinctive designations to goods, simplifying rate calculation and assuring uniformity throughout the sector.
3. Impact on Pricing and Handling: Shipping expenses are directly impacted by freight categorization. According to the classification of the commodity, carriers use the NMFC code to establish pricing. more classes signify lesser density and more specialized handling demands, whereas lower classes indicate more density and fewer handling requirements.
4. Determining Freight Class: By reviewing resources like the NMFC book, speaking with freight professionals, or using internet tools made especially for classification, shippers can identify the freight class of their goods.
5. Disputing Freight Classification: You have the choice to contest the allocated freight class if you think it is inaccurate. Go over the categorization basis, get in touch with the carrier, offer justifications, and adhere to the carrier's dispute resolution procedure. If necessary, seek expert assistance.

Businesses need to understand freight categorization in order to appropriately price their shipments and guarantee proper handling. You can more successfully manage the freight classification process and streamline your shipping operations by adhering to the principles covered in this guide.

Keep in mind that accurate classification ensures your products receive the proper attention they require as well as fair pricing. Keep up with industry news, make use of your resources, and connect with experts when necessary. Understanding freight categorization will help your shipping efforts be successful.

Sources

Updated November 7, 2026. The new sections of this guide were checked on that date against the publications below. The NMFC changes twice a year, so confirm the item and class for your freight in the current NMFC before you ship.

• NMFTA: National Motor Freight Classification (NMFC)
• NMFTA Disposition Bulletin 1371, Docket 2025-1 (March 21, 2025), standard 13-subprovision density scale
• NMFTA FCDC Density Guidelines (the 18 classes)
• NMFTA Help Center: NMFC Classification FAQs
• NMFTA Help Center: NMFC Classification Glossary of Terms
• NMFTA Help Center: Is NMFTA a government body?
• NMFTA Help Center: Calculating Density Best Practices
• NMFTA Help Center: How to classify a mixed-freight package, skid, or crate (Item 110)
• NMFTA Help Center: What are the updates to Item 250100?
• NMFTA Help Center: Why does using the correct classification codes matter?
• NMFTA Help Center: Upcoming Key Dates for the NMFC Data Updates
• NMFTA Docket 2026-2 Disposition, Subject 1 (October 9, 2026)
• Old Dominion Freight Line: Navigating the NMFC Changes