Understanding Freight Class for LTL Shipping
Less-than-truckload (LTL) shipping is a common method for moving freight that doesn't fill an entire trailer. Unlike truckload shipping where you pay for the whole truck, LTL rates depend on your shipment's freight class, a classification from 50 to 500 based on the National Motor Freight Classification (NMFC) system. Knowing your freight class is critical for LTL because it directly affects your shipping costs and how carriers handle your freight.
If you're new to freight class, start with our guide on What Is Freight Class? Definition & NMFC Guide 2026 to understand the basics.
Why Freight Class Matters for LTL
LTL carriers consolidate shipments from multiple customers in one trailer. Your freight class tells them how dense, easy to handle, and valuable your items are. Denser items (like steel) get a lower class number (e.g., 50), while light, bulky items (like pillows) get a higher class (e.g., 400-500). Higher class means higher cost per pound because they take up more space relative to weight. Carriers also consider stowability (can it stack?), handling (is it fragile?), and liability (is it valuable?). These factors are built into the NMFC.
For a step-by-step way to find your class, see our How to Calculate Freight Class: Step-by-Step Guide 2026.
LTL vs. Other Shipping Modes: A Comparison
Freight class is most important for LTL. Truckload (TL) and parcel shipping use different systems. The table below highlights key differences.
| Factor | LTL Shipping | Truckload (TL) | Parcel (e.g., UPS, FedEx) |
|---|---|---|---|
| Typical Weight | 150 – 15,000 lbs | 15,000 – 45,000 lbs | 1 – 150 lbs |
| Freight Class Used? | Yes (NMFC 50-500) | No (mostly just weight) | No (dimensional weight rules) |
| Pricing Model | Density-based via class | Flat rate per mile or per truck | Weight and box size (DIM) |
| Handling | Often requires liftgate/inside delivery | Usually dock-to-dock | Door-to-door, minimal handling |
| Typical Freight Classes | 50 – 500 | N/A | N/A (but can be 100-300 if LTL-like) |
For a full list of classes and examples, visit Freight Class Ranges 50-500: What They Mean & Examples.
How Freight Class Affects LTL Rates
LTL carriers use a formula that multiplies your freight class by your shipment's weight and a base rate. For instance, a class 100 shipment costs more per hundredweight (CWT) than a class 60 shipment of the same weight. The key variable is density, calculated as:
Density (lbs/cu ft) = Weight (lbs) ÷ Volume (cubic ft)
Volume = Length × Width × Height (in inches) ÷ 1,728. Use our Freight Class Density Formula Calculator to find density and class quickly.
Carriers also apply accessorial charges for things like liftgate, residential delivery, or inside pickup. Knowing your class helps you avoid reclassification fees (which can double your cost).
Tips for LTL Shippers to Optimize Freight Class
- Measure accurately: Even a few inches off can change your class. Use our tool to double-check.
- Package efficiently: Reduce wasted space to increase density. For example, remove pallet overhang.
- Consider using a freight class calculator: Our Freight Class Calculator helps you estimate class and cost before shipping.
- Classify correctly: Misclassifying leads to extra fees. If unsure, ask your carrier for an NMFC number.
For more common questions, see our Freight Class FAQ: Common Questions Answered 2026.
Conclusion
Freight class is the backbone of LTL shipping pricing. By understanding how density, stowability, handling, and liability affect your class, you can predict costs and avoid surprises. Use our free calculator to get your class and estimate shipping costs in seconds. Whether you're shipping auto parts (class 70) or furniture (class 125), getting the class right saves money.
Try the free Freight Class Calculator ⬆
Get your Freight class is a standardized classification system (NMFC) for shipping, based on density, ranging from 50 to 500. result instantly — no signup, no clutter.
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