Table of Contents
- What Are LTL Freight Classes and How Do They Work?
- How Do You Calculate Freight Density and Determine Your Class?
- What Changed with LTL Freight Classification in 2025 and 2026?
- What Is an NMFC Code and How Does It Relate to Freight Class?
- How Do LTL Freight Classes Affect Your Shipping Costs?
- How Can You Reduce LTL Freight Classification Costs?
- What Are the Most Common LTL Freight Classes by Commodity?
- What Is the Difference Between LTL Freight Class and NMFC Code?
- How Do Carriers Verify Freight Class?
- What LTL Freight Services Support These Classifications?
- Frequently Asked Questions About LTL Freight Class
- Conclusion
- Sources
LTL freight class is a standardized 18-tier system — numbered 50 through 500 — that determines less-than-truckload shipping costs based on four factors: density, stowability, handling, and liability. Lower class numbers mean lower shipping rates, while higher class numbers apply to bulky, fragile, or difficult-to-handle freight that costs more to move.
The classification system underwent its biggest transformation in decades on July 19, 2025, when NMFC Docket 2025-1 expanded density-based pricing to approximately 2,000 commodity items. A follow-up docket — Docket 2026-1, released February 6, 2026 — continued refining those changes. If you ship LTL regularly, understanding how freight class works in this new environment directly affects what you pay on every shipment between 150 and 15,000 pounds.
What Are LTL Freight Classes and How Do They Work?
LTL freight classes are standardized categories created and maintained by the National Motor Freight Traffic Association (NMFTA). The system includes 18 classes numbered from 50 to 500. Class 50 represents the densest, most compact freight — things like steel, bricks, or hardwood flooring — and carries the lowest rates. Class 500 covers the lightest, most awkward items, like ping pong balls or deer antlers, and carries the highest rates.
Every LTL shipment must be assigned a class before a carrier can quote a rate. The class tells the carrier how efficiently they can load your freight, how carefully it must be handled, and how much liability risk they’re taking on.
Four factors determine your freight class:
- Density: Weight per cubic foot — the single most important factor after the 2025 NMFC overhaul
- Stowability: How well the freight fits alongside other cargo in a trailer
- Handling: Ease of loading and unloading, including any special equipment required
- Liability: Risk of theft, damage, spoilage, or harm to surrounding freight
For most general commodities today, density is the deciding factor. The other three characteristics can still push a commodity into a higher class, but density drives the baseline classification for the vast majority of LTL freight.
How Do You Calculate Freight Density and Determine Your Class?
The density formula is straightforward: divide the shipment weight in pounds by the volume in cubic feet. Volume equals length times width times height (all in inches) divided by 1,728.
Example: A pallet measuring 48″ × 40″ × 36″ tall and weighing 300 pounds. Volume = (48 × 40 × 36) ÷ 1,728 = 40 cubic feet. Density = 300 lbs ÷ 40 cu ft = 7.5 lbs per cubic foot, which falls into Class 150.
After the July 2025 NMFC updates, the density scale expanded from 11 to 13 subprovisions — adding Class 50 and Class 55 for extremely dense freight. This means heavy, compact shipments that previously landed in Class 60 may now qualify for lower-cost Class 50 or 55 pricing.
The table below shows the full density-to-class mapping under the updated 2025–2026 system:
| Density (lbs per cu ft) | Freight Class | Example Commodities |
|---|---|---|
| 50+ lbs/cu ft | Class 50 | Steel, bricks, hardwood flooring, canned goods |
| 35–50 lbs/cu ft | Class 55–60 | Machinery, automotive parts, glass |
| 30–35 lbs/cu ft | Class 65 | Car parts, bottled beverages, cast iron products |
| 22.5–30 lbs/cu ft | Class 70–77.5 | Food items, auto engines, appliances |
| 15–22.5 lbs/cu ft | Class 85–92.5 | Computers, electronics, musical instruments |
| 10.5–15 lbs/cu ft | Class 100 | Boat covers, car covers, wine cases |
| 8–10.5 lbs/cu ft | Class 125 | Small appliances, packaged goods |
| 6–8 lbs/cu ft | Class 150 | Auto sheet metal, ATVs, medical equipment |
| 4–6 lbs/cu ft | Class 175 | Clothing, couches, stuffed furniture |
| 2–4 lbs/cu ft | Class 200–250 | Mattresses, auto body parts, plasma TVs |
| 1–2 lbs/cu ft | Class 300 | Wood cabinets, boxes of chain, bamboo furniture |
| Less than 1 lb/cu ft | Class 400–500 | Ping pong balls, deer antlers, gold dust |
Always measure the longest, widest, and tallest points of your packaged freight — including any overhang or irregular protrusions. Carriers use actual dimensions when inspecting shipments, not estimates.
What Changed with LTL Freight Classification in 2025 and 2026?
The July 19, 2025 NMFC Docket 2025-1 was the largest reclassification event in decades. The NMFTA shifted approximately 2,000 commodity items — roughly 30% of all LTL freight — from commodity-based classification to density-based pricing. Instead of looking up what an item is, carriers and shippers now primarily care about how dense it is.
Key changes from the 2025 overhaul include:
- Exact dimensions required: Generic NMFC item descriptions are no longer sufficient for many commodities — carriers require actual measurements to assign a class
- 13-subprovision density scale: The previous 11-tier scale expanded to 13 tiers, adding Class 50 and 55 for very dense freight
- 2,000 consolidated commodity listings: NMFTA combined similar items to reduce lookup complexity and standardize pricing
- Liability and handling flags: High-liability or difficult-to-handle items now carry specific flags that affect class assignment independent of density
Docket 2026-1, released February 6, 2026, continued this transition by refining additional commodity classifications and further consolidating the NMFC item list. A public comment period closed in March 2026, with more updates expected later in the year.
The practical result: lightweight bulk freight is more expensive than before, while heavy, dense freight may qualify for lower rates under the new Class 50 and 55 tiers. Shippers using a FedEx Freight Class Calculator can verify how these updates affect specific shipments.
What Is an NMFC Code and How Does It Relate to Freight Class?
An NMFC code is a specific item number assigned by the NMFTA to identify a commodity within the National Motor Freight Classification system. Every LTL shipment needs both an NMFC code and a freight class — the code identifies what you’re shipping, while the class determines the rate.
Think of it this way: the NMFC code is the commodity’s identity, and the freight class is the pricing tier. Before July 2025, most NMFC codes had a fixed class regardless of dimensions. Now, many codes lead to a density calculation that produces the actual class.
The authoritative source for current NMFC codes and classes is ClassIT+, the NMFTA’s digital classification tool. ClassIT+ replaced the previous NMFC Item Lookup Tool and is the single source of truth for classification, density rules, and docket updates. Subscriptions are available through the NMFTA website.
How Do LTL Freight Classes Affect Your Shipping Costs?
Freight class is one of the biggest levers in your LTL invoice. A shipment in Class 50 costs far less per pound to ship than the same weight in Class 300, which can run several times higher per pound. The multiplier effect is significant at any volume.
Beyond the base rate, class affects two additional cost areas:
- Reclassification charges: If a carrier’s dock team measures your freight and determines the actual class is higher than what you declared, they’ll charge the difference plus a reclassification fee. These fees can add 20–50% to the original quoted rate.
- Reweigh charges: Carriers routinely weigh and dimension-scan LTL freight. If your declared weight is off, you’ll face additional charges on top of any class adjustment.
In 2025, major LTL carriers implemented general rate increases ranging from 4.9% to 7.9%: ABF Freight and FedEx Freight at 5.9%, Saia at 7.9%, and Old Dominion at 4.9%. With baseline rates already elevated, avoiding reclassification surprises is more important than ever going into 2026.
How Can You Reduce LTL Freight Classification Costs?
You can’t change your freight class arbitrarily, but you can take real steps to ensure you’re landing in the correct — and lowest applicable — class.
Measure accurately and consistently. Always measure dimensions at the widest points, including any packaging overhang. The July 2025 NMFC changes made exact dimensions mandatory for thousands of commodities. One inch of error can push a shipment into a higher class.
Optimize your packaging. Reducing void space inside boxes and using proper corrugated boxes with appropriate ECT ratings increases your freight’s density per cubic foot. Denser freight typically earns a lower class. Switching from loosely packed boxes to tighter packaging can drop a shipment from Class 150 to Class 125 or lower.
Palletize whenever possible. Palletized freight is more stowable and easier to handle, which works in your favor on the stowability and handling classification factors. It also reduces the risk of carrier-assessed handling surcharges.
Use a freight class calculator before booking. Running dimensions through a freight class calculator before you create a bill of lading catches errors before the carrier does. The LTL class chart is also a useful quick-reference when evaluating commodities.
Verify your NMFC code in ClassIT+. After the 2025 overhaul, some commodity codes changed significantly. A commodity you’ve been shipping under a specific code for years may now require an updated code and a density calculation instead of a fixed class.
Negotiate FAK agreements with carriers. Freight All Kinds (FAK) pricing allows you to ship multiple freight classes under a single agreed-upon class — typically beneficial if you ship items across a range of classes. Carriers are more open to FAK negotiations with high-volume shippers.
What Are the Most Common LTL Freight Classes by Commodity?
While every shipment requires a formal density calculation and NMFC code lookup, some commodity categories consistently fall within predictable class ranges. The table below provides a general reference — always verify with ClassIT+ for the exact current classification.
| Commodity Category | Typical Freight Class | Key Classification Consideration |
|---|---|---|
| Building materials (steel, brick, concrete) | Class 50–55 | Very high density; rarely reclassified |
| Machinery and industrial equipment | Class 60–70 | Density and handling complexity both factor in |
| Automotive parts (solid components) | Class 65–85 | Body panels and sheet metal skew higher |
| Electronics and computers | Class 85–100 | Liability factor can push class higher |
| Furniture and home goods | Class 85–125 | Packaging and pallet density matter most |
| Clothing and textiles | Class 100–150 | Bulky packaging hurts density |
| Mattresses and boxsprings | Class 200–250 | Low density despite significant weight |
| Empty plastic bottles | Class 200–300 | Almost entirely volume-driven |
If your commodity appears in the table above at a class higher than expected, review your packaging. Tighter packing, smaller boxes, or palletization can legitimately lower the density-calculated class.
What Is the Difference Between LTL Freight Class and NMFC Code?
These two terms are related but serve different purposes. An NMFC code is a lookup identifier — a specific number that tells you where to find your commodity in the National Motor Freight Classification directory. The freight class is the pricing tier that the NMFC code resolves to, based on your commodity’s characteristics and (increasingly) its density.
Before 2025, most NMFC codes had a fixed freight class assigned directly to them. The July 2025 overhaul broke this link for roughly 2,000 commodities: the NMFC code now points you to a density scale, and the freight class you land in depends on your actual measured density.
For shippers, this means bill of lading accuracy now requires two things: the correct NMFC code and the correct density-derived class. Getting one right without the other is enough to trigger a reclassification on the dock.
Resources like the LTL class codes guide and the LTL freight class chart can help you cross-reference codes and classes efficiently.
How Do Carriers Verify Freight Class?
Most major LTL terminals use dimensioning systems — automated scanners that photograph and measure every pallet as it moves through the facility. These systems capture length, width, height, and weight in seconds, then compare the results against what was declared on the bill of lading.
If the dimensions or weight don’t match, the carrier generates an inspection exception. The shipment gets reclassified to the correct class based on actual measurements, and the shipper receives a corrected invoice with additional charges — including a reweigh or reclassification fee on top of the rate difference.
This process happens on a significant percentage of LTL shipments, particularly for shippers who use estimates or outdated NMFC codes. Accurate declarations from the start are the only reliable way to avoid these adjustments.
What LTL Freight Services Support These Classifications?
Standard LTL carriers — including FedEx Freight, Old Dominion, Saia, ABF Freight, and XPO — all use the NMFC classification system for pricing. Each carrier applies the same class structure but applies their own base rates and fuel surcharges on top, which is why the same shipment can receive different quotes from different carriers.
ParcelPath’s LTL shipping platform lets you compare carrier rates across the same freight class, giving you a straightforward view of actual cost differences without having to contact each carrier individually. Understanding your LTL class accurately before comparing quotes ensures you’re looking at apples-to-apples rates.
For shippers new to freight classification or those navigating the post-2025 NMFC changes, the LTL freight overview and class LTL breakdown are useful starting points.
Frequently Asked Questions About LTL Freight Class
What is the most common LTL freight class?
Classes 70 through 125 cover the largest share of general LTL shipments, including furniture, electronics, food products, and packaged goods. Class 70 is particularly common for automotive parts and appliances. After the 2025 NMFC overhaul, many commodities that previously fell in Class 85–100 were reclassified based on density, so verify your current class through ClassIT+ rather than relying on historical codes.
Can freight class change after pickup?
Yes. Carriers routinely inspect, weigh, and dimension-scan LTL shipments at their terminals. If your declared class doesn’t match the carrier’s measured class, they will reclassify the shipment and issue a revised invoice. Reclassification charges typically add 20–50% to the original quoted rate. The best way to avoid this is to measure accurately, use the current NMFC code, and calculate density before completing your bill of lading.
What happened to freight classification in July 2025?
NMFC Docket 2025-1 took effect July 19, 2025, shifting approximately 2,000 commodity items — about 30% of all LTL freight — from commodity-based to density-based classification. The density scale also expanded from 11 to 13 tiers. Many commodities that previously had a fixed class now require exact measured dimensions to determine the correct class. A follow-up docket (2026-1) released in February 2026 continued refining these changes.
What is the difference between freight class and freight rate?
Freight class is a standardized category (50 through 500) that reflects how difficult a shipment is to transport. Freight rate is the actual dollar amount a carrier charges, which is based on the freight class combined with the carrier’s base rate tariff, the shipment’s origin and destination, fuel surcharges, and any applicable accessorials. Two carriers can quote different rates for the exact same freight class because they apply different base tariffs on top of the shared classification system.
How do I find the NMFC code for my product?
The authoritative source is ClassIT+, available at classitplus.nmfta.org, which replaced the old NMFC Item Lookup Tool. ClassIT+ requires an NMFTA subscription but provides the most current codes, density rules, and docket updates. For quick estimates, freight brokers and 3PLs can often look up your commodity’s code. Be cautious using outdated printed NMFC guides — the 2025 docket made thousands of changes, and old codes may no longer be accurate.
Does packaging affect freight class?
Packaging affects freight class directly by changing your shipment’s density. If you pack items loosely in oversized boxes, the added cubic volume lowers your density per cubic foot, potentially pushing you into a higher class. Tighter packaging, right-sized boxes, and proper palletization can legitimately increase density and reduce your freight class — lowering the rate without changing the commodity itself. Packaging also affects the handling and stowability factors, which can independently influence class for difficult-to-stack or fragile items.
Conclusion
LTL freight class determines more of your shipping cost than almost any other factor on the bill of lading. The July 2025 NMFC overhaul made density the dominant driver for thousands of commodities, and the February 2026 Docket 2026-1 continued tightening those standards. Shippers who measure accurately, verify current NMFC codes in ClassIT+, and optimize packaging density are the ones avoiding reclassification charges and controlling their costs in this environment.
ParcelPath’s tools — including the freight class calculator and the LTL class chart — give you a straightforward way to confirm classifications before booking. Accurate classification upfront means fewer surprises after pickup, and cleaner invoices every time.
Sources
- National Motor Freight Traffic Association, nmfta.org
- ClassIT+ Classification Tool, classitplus.nmfta.org
- FedEx Freight Classification Guide, fedex.com
- Old Dominion Freight Line Classification Information, odfl.com
- UPS Freight Classification Resources, ups.com
- NMFC Docket 2025-1 and 2026-1 Documentation, nmfta.org
Freight class is set by the NMFTA’s official freight class standards.
Part of our LTL Class Chart guide. Related: Freight Class Codes, Freight Class Calculator, LTL Density Calculator.
