Key Takeaways

Freight class is one of the main levers behind ltl freight pricing because it tells ltl carriers how much cost, risk, and trailer space your shipment creates.

• Modern nmfc classes come from the national motor freight classification and are driven by density, stow ability, handling, and liability.
• A freight classification chart or freight class calculator helps calculate density before you ship, reducing reclassification fees, invoice disputes, and delays.
• Forefront Global Logistics helps shippers choose the correct nmfc code, correct nmfc item number, and nmfc freight class for ltl shipments across road, intermodal, air, and ocean legs, while our LTL shipping services platform simplifies quoting and execution.
• This guide explains how to read a chart, calculate freight density, and control shipping costs.

What Is Freight Class and Why It Matters for LTL Shipments

Freight classification is the standardized way North American motor freight rates are organized for less than truckload shipping. A freight class is a rating from 50 to 500 defined by the National Motor Freight Traffic Association through the National Motor Freight Classification system; the motor freight classification nmfc method categorizes commodities into one of 18 classes based on density, handling, stowability, and liability.

These classes apply mainly to ltl shipments and less than truckload ltl road freight, not parcel, full truckload, or full-container ocean freight shipping moves. Rates in LTL shipping are billed per hundred pounds, or CWT, with lower class numbers corresponding to lower baseline rate standards. The higher the class, the higher the cost per CWT and usually the higher total shipping costs.

A pallet of dense steel parts may earn a lower class, while bulky foam displays become higher class freight because they use more space compared with their weight. Forefront Global Logistics validates class and code before booking to prevent surprise re-bills.

How Freight Class Is Determined: The Four Key Factors

NMFTA uses four factors: density, stowability, handling, and liability. Density is now the primary factor in determining freight class, with lower density typically resulting in a higher freight classification and cost, while higher density usually results in a lower classification. Still, the other factors can move freight into higher classes.

Every commodity is tied to an nmfc code that may be fixed or class based on density. The same product can change class when packed differently: loose cartons create lower density; tighter cartons create higher density; a pallet, crate, or other packaging changes total measurements. FGL reviews product specs, packaging, and freight shipments history to map many commodities correctly and align them with appropriate road freight transport services.

Freight Classification Chart: Understanding Classes 50–500

A freight classification chart compares different classes with density ranges, example commodities, and relative pricing. Shippers use it with a freight class calculator to check whether a quoted class makes sense.

The NMFC system includes 18 distinct freight classes, ranging from Class 50 to Class 500. These classes are:

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

Freight Class	Typical Density Range (lbs per cubic foot)	Example Commodities
50–70	15+ to 50+	steel bars, bricks, canned food
77.5–125	6 to 15	machinery, boxed goods, car covers, furniture
150–200	4 to 6	assembled furniture, textiles, fragile goods
250–500	under 4	foam, assembled displays, bulky lightweight freight

Lower-density freight occupies more trailer space per pound, so classes 250–500 often cost more. Some NMFC codes assign a fixed class independent of density, such as certain pharmaceuticals, hazardous materials, or high-value electronics. Moving from class 150 to 85 through better packaging or consolidation can materially reduce LTL spend.

On July 19, 2025, the National Motor Freight Traffic Association (NMFTA) will implement a new 13-tier density-based classification scale, replacing the previous 11-class system. The upcoming changes will affect nearly 2,000 commodities, which will be moved to a newly expanded density table containing 13 classes, adding classes 50 and 55 for higher densities. The current 11-tier scale used for many density-based commodities will be expanded to a 13-tier table, while the existing 18-tier classification density scale will remain unchanged. The NMFTA’s new online classification tool, ClassIT+, will be launched alongside the new density-based classification system to improve pricing accuracy for shippers.

Density and Freight Class: How to Calculate Density Correctly

To calculate density, measure length, width, and height x width at the farthest points, including pallet, wrap, and packaging. Multiply the three measurements in cubic inches, get total cubic inches, divide by 1,728 for total cubic feet, then divide weight by cubic foot volume.

Example: 48” x 40” x 40” = 76,800 cubic inches. 76,800 ÷ 1,728 = 44.44 cubic feet. An 800-lb shipment is 800 ÷ 44.44 = 18 lbs per cubic foot, usually class 70. Under 4 PCF often means higher classes; 4–8 is mid-range; 15+ supports lower freight classes. Accurate measurement of a shipment’s dimensions and weight is essential for determining the correct freight class, as misclassification can lead to unexpected fees and higher shipping costs.

Stowability, Handling, and Liability: Beyond Pure Density

Stowability refers to how easily a commodity can be stored with other freight, and more difficult-to-stow items will increase the freight class and cost. Odd-shaped machinery, hazardous materials, unstackable pallets, or regulated cargo hurt stowability.

Handling involves the ease of managing a commodity during transport, where more fragile or complex items will lead to a higher freight class and increased shipping costs. At an ltl terminal, loose parts, tall pallets, glass, unstable loads, and side-load-only freight can require special handling and additional fees, while time-critical or high-value freight may be routed via international air freight instead of road.

Liability assesses the risk of damage or theft associated with a shipment; higher liability risks will increase the freight class and associated costs. FGL evaluates the commodity’s transportability, handling requirements, value, and mode options before customers ship high-risk commodities, leveraging specialized industrial and aerospace logistics capabilities where required.

NMFC Codes and How to Use Them with a Freight Class Chart

An NMFC code is a numeric identifier for a commodity description, packaging type, and classification. Each code may be fixed or density-based, so the chart must be read with the applicable item and sub-item.

Canned food, wooden furniture, and plastic pellets may fall into different commodities and different classes depending on packaging, and fast-moving goods for stores and ecommerce channels benefit from tailored consumer and retail logisticsto keep freight flowing efficiently. The correct nmfc code must appear on the BOL for ltl freight; old or mistyped codes commonly cause reclassification and extra charges. Public tools help, but official NMFC listings and carrier tariffs control final pricing.

Using a Freight Class Calculator to Estimate Shipping Costs

A freight class calculator uses length, width, height, weight, packaging type, and sometimes NMFC hints to estimate class, but you still need a partner providing end-to-end supply chain solutions to turn those estimates into optimized routing and pricing. Measure after final palletizing because wrap, corner boards, and pallet height change density. Use the output to compare LTL, partial truckload, and intermodal options, then let FGL combine it with carrier rules and live pricing.

How Freight Class Influences Your Overall Shipping Costs

LTL carriers price by class, weight, distance, and accessorials. A move from class 175 to 92.5 on repeat Chicago-to-Dallas lanes can sharply reduce CWT charges. High classes may also raise minimums, limit stacking, and trigger inspections. Accurate freight classification helps avoid reclassification fees and unexpected cost adjustments, keeping budgets predictable across road, drayage, intermodal transport, ocean freight, and air freight.

Practical Tips to Avoid Freight Class Mistakes

Capture precise inches and pounds with calibrated tools. Do not eyeball dimensions or reuse specs after package changes. Review codes annually or whenever design, material, or packaging changes. Standardize pallets, shrink wrap, and corner protection to improve density and reduce handling issues. Involve Forefront Global Logistics early during launch or redesign to pursue a lower freight classification before volume scales.

How Forefront Global Logistics Supports Accurate Freight Classification

Forefront Global Logistics is a B2B logistics provider specializing in multimodal freight and LTL optimization, and our Who we are overview explains the team and philosophy behind our service model. Our account managers review catalogs, packaging standards, and historical bills to validate NMFC codes and classes across road freight, intermodal transport, drayage, ocean freight, air freight, warehousing, and expedited or hotshot shipping.

We support automotive, fresh and frozen foods, healthcare and pharma, industrial and aerospace, technology, retail, and consumer goods shippers through dedicated automotive logistics solutions and secure, high-visibility technology logisticsprograms.

Request a freight review, ask for a quote on current LTL lanes, email info@forefrontlog.com, or call 773-466-8283 for classification help.

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