Ecommerce

Understanding Freight Class: What is Class in Freight Shipping?

June 9, 2025
7 min read

When it comes to freight shipping, there’s a significant difference between getting something from point A to point B and doing it efficiently and cost-effectively. Did you know that nearly 70% of all freight tonnage in the U.S. moves by truck? This underscores the importance of understanding the various aspects of shipping logistics, especially freight class. But what exactly is freight class, and why does it matter to you as an ecommerce merchant?

At ShipAid, we believe that every package matters. Robust shipping protection is not just about safeguarding shipments; it’s also about enhancing customer satisfaction and driving business revenue. In this blog post, we aim to demystify freight classes, why they matter for shipping, and how understanding them can empower your shipping strategy. By the end, you’ll have a clearer idea of how freight classifications work, the factors that influence them, and how they can ultimately affect your bottom line.

Introduction

Imagine a world where shipping costs were unpredictable, and every package you sent had a different price tag depending on the carrier’s whims. That chaos is mitigated by a system known as freight class. The freight class system standardizes shipping costs based on specific characteristics of the cargo, allowing for a more streamlined and predictable shipping process.

In this article, we will cover the following aspects:

  1. What is Freight Class?
  2. The Importance of Freight Class in Shipping
  3. How Freight Class is Determined
  4. The Role of Density in Freight Classification
  5. Handling, Liability, and Stowability Factors
  6. Navigating the 18 Freight Classes
  7. Implications for Ecommerce Merchants
  8. Conclusion and Next Steps
  9. FAQ Section

By the end of this post, we hope you’ll not only understand what freight class is but also how leveraging this knowledge can enhance your shipping strategy and contribute to your business growth.

What is Freight Class?

Freight class is a standardized shipping classification used primarily for less-than-truckload (LTL) shipments. Established by the National Motor Freight Traffic Association (NMFTA), this system categorizes freight into 18 different classes, ranging from 50 to 500. Each class corresponds to certain characteristics that affect shipping costs.

At its core, freight class serves to standardize pricing and facilitate communication between shippers and carriers, making it easier to negotiate rates and understand the costs associated with shipping various types of cargo.

Why is Freight Class Important?

Understanding freight class is essential for any ecommerce merchant for several reasons:

  • Cost Management: Correctly classifying your freight can lead to lower shipping costs. A lower freight class generally translates to lower shipping fees.
  • Avoiding Reclassification Fees: Misclassifying freight can result in unexpected costs if the carrier reclassifies your shipment and charges you at the higher rate.
  • Enhanced Customer Trust: Reliable shipping practices, including accurate freight classification, enhance customer trust and satisfaction, leading to repeat business.
  • Streamlined Shipping Processes: By understanding freight classes, you can effectively manage logistics, improving efficiency in your supply chain.

How Freight Class is Determined

Freight class is determined based on four primary characteristics:

  1. Density: This measures the weight of the freight relative to its volume. A higher density generally results in a lower freight class.
  2. Ease of Handling: Some items require special handling due to their shape, weight, or fragility, which can affect their classification.
  3. Liability: The likelihood of damage or theft associated with certain types of freight can increase its class.
  4. Stowability: This refers to how easily a shipment can be stowed alongside other freight, with limited space or irregular shapes resulting in a higher class.

The Role of Density in Freight Classification

Density is perhaps the most crucial factor in determining freight class. It is calculated as the weight of the item per cubic foot. For example:

  • Class 50: Items weighing more than 50 lbs. per cubic foot.
  • Class 500: Items weighing less than 1 lb. per cubic foot.

Understanding how to calculate density can help you determine the correct freight class for your shipments, ultimately impacting your shipping costs.

Calculating Freight Density

To calculate the density of your freight, use the formula:

[ \text{Density} = \frac{\text{Weight (lbs)}}{\text{Volume (cubic feet)}} ]

Where volume can be calculated by:

[ \text{Volume} = \left(\frac{\text{Length (inches)} \times \text{Width (inches)} \times \text{Height (inches)}}{1728}\right) ]

By accurately determining the density of your freight, you can ensure that you classify it correctly, helping to manage your shipping costs effectively.

Handling, Liability, and Stowability Factors

1. Handling

Handling factors into freight class based on how easy or difficult an item is to load, transport, and unload. For example, fragile items or those requiring special equipment for loading will typically fall into a higher freight class.

2. Liability

Liability refers to the risk associated with transporting the goods. High-value items or those that are easily damaged may incur higher shipping fees due to the increased risk. For example, perishable goods will often carry a higher classification due to their liability concerns.

3. Stowability

Stowability takes into account how easily a shipment can be arranged alongside other items in the transport vehicle. Items that are bulky, oddly shaped, or hazardous may require more space or special handling, thus increasing their freight class.

By considering these factors, you can better prepare your shipments for transportation and avoid unnecessary costs.

The NMFTA has established 18 distinct freight classes, each with its own pricing structure based on the aforementioned factors. Here’s a quick overview of these classes:

  • Class 50: Heavy, dense items that are easy to handle.
  • Class 100: Standard items that are moderately dense.
  • Class 175: Bulkier items that may require special handling.
  • Class 500: Very light items that may be fragile or difficult to handle.

Understanding these classifications can help you make informed decisions regarding pricing and shipping strategies.

Implications for Ecommerce Merchants

For ecommerce merchants, understanding freight class is not just about managing shipping costs; it’s about building a reliable shipping strategy that enhances customer satisfaction.

How Freight Class Affects Your Business

  • Pricing Strategy: By accurately classifying your products, you can provide more accurate shipping quotes to your customers, enhancing transparency and trust.
  • Inventory Management: Understanding how different products are classified can help you make better decisions regarding inventory management and shipping logistics.
  • Customer Experience: Efficient shipping practices lead to faster deliveries, which can significantly improve customer experiences and drive repeat business.

Conclusion and Next Steps

In summary, understanding freight class is essential for navigating the complexities of freight shipping. By leveraging this knowledge, you can optimize your shipping strategies, reduce costs, and enhance customer satisfaction.

As an ecommerce merchant, we encourage you to explore our innovative shipping protection solutions at ShipAid, designed to safeguard every package while converting potential losses into revenue opportunities. Our interactive demo can show you how our shipping protection works in real time—experience it for yourself here.

FAQ Section

1. What is freight class?
Freight class is a classification system used in the shipping industry to standardize pricing based on specific characteristics like density, handling, liability, and stowability.

2. How many freight classes are there?
There are 18 freight classes, ranging from 50 (least expensive) to 500 (most expensive).

3. How is freight class determined?
Freight class is determined based on the density of the item, how easy it is to handle, the liability associated with the item, and how easily it can be stowed with other freight.

4. Why is understanding freight class important?
Understanding freight class helps merchants manage shipping costs effectively, avoid unexpected fees, and enhance customer trust through reliable shipping practices.

5. How can ShipAid help my ecommerce business?
At ShipAid, we provide shipping protection solutions that ensure every package is safeguarded, allowing you to focus on growing your business. Check out our app here for more information.

By investing time in understanding freight class and implementing effective shipping strategies, we can together ensure that every package matters, driving your ecommerce success.


Participation is optional and ShipAid is not insurance. It does not provide indemnification for loss, damage, or liability. Instead, it allows brands to offer a free replacement if an item is not delivered or arrives in unsatisfactory condition. ShipAid does not sell or ship products, but provides tools for brands to manage replacements. All resolution decisions are made by the brand and may require proof of damage or non-delivery or other information

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