Let’s play a little logistics game. You’re shipping a pallet of merchandise to a customer across the country. You go online, request an LTL (Less-Than-Truckload) shipping quote, and boom sticker shock. The rate’s higher than you expected. You think, “Wait… why is this so expensive? It’s just one pallet!”
You double check your info:
- Weight? Correct.
- Dimensions? On point.
- Origin and destination? No mistake there.
Then you spot the culprit: Freight class. Ah yes, that little detail that somehow makes a big difference. “But what even is a freight class; and how does it affect my LTL costs?” Buckle up, because today we’re diving deep into the world of freight classes, and why understanding them can save you time, money, and shipping headaches. We’ll cover:
- What freight class actually means
- The 18 different classes (yep, there are 18!)
- How your freight gets classified
- The direct impact of freight class on your LTL shipping rates
- How to avoid overpaying by choosing the right class
- Pro tips to optimize your freight classification and cut costs
Let’s roll!
What is Crossdocking ? (Read our Article here)
Crossdocking is a logistics method where incoming freight is unloaded, sorted, and shipped out with little to no storage time. Instead of sitting on shelves, products flow directly from the receiving dock to outbound transportation.
Benefits of crossdocking:
- Faster delivery – Goods reach stores or customers within hours.
- Lower storage costs – Reduces the need for warehousing.
- Fewer handling steps – Less damage and labor.
- Improved inventory turnover – Products move quickly and efficiently.
What Is Freight Class in LTL Shipping?
Think of freight class as the DNA of your shipment. It’s a standardized classification system created by the National Motor Freight Traffic Association (NMFTA) to group freight based on specific characteristics that influence how easy (or difficult) it is to ship. There are 18 freight classes, ranging from Class 50 to Class 500. Each class represents a different cost tier with lower numbers = cheaper to ship, and higher numbers = more expensive.
The classification is used by LTL carriers to:
- Determine pricing
- Optimize trailer space
- Assess handling requirements
- Identify liability risk
If your shipment has a higher freight class, expect to pay more.
The 4 Main Factors That Determine Freight Class
Here’s where it gets interesting. Your freight class isn’t picked at random—it’s based on four main characteristics of your shipment. Let’s break them down:
1. Density (Weight-to-Size Ratio) This is the #1 factor for most LTL shipments. Density = weight ÷ volume. The denser your freight (more weight in less space), the lower your class—and the cheaper it is to ship.
|
Example |
Weight |
Dimensions (in) |
Density |
Likely Class |
|
Heavy machinery |
2,000 lbs |
48 x 40 x 48 |
High |
Class 50-70 |
|
Styrofoam coolers |
200 lbs |
60 x 48 x 60 |
Low |
Class 300-400 |
Why it matters: Light, bulky items take up a lot of trailer space but don’t contribute much weight—so they’re priced higher to compensate.
2. Stowability
Can it be stacked or packed tightly with other freight?
- Yes: You get a lower class (better pricing)
- No: You might bump up a few classes
Items that are oddly shaped, sharp, hazardous, or can’t be stacked reduce trailer efficiency—and that affects pricing.
3. Handling: Is your freight easy to move with a forklift or pallet jack?
- Crated machinery? No problem.
- Loose parts with sharp edges or fragile items? More handling risk = higher class.
The more labor or caution required, the more you’ll pay.
4. Liability This includes:
- How likely the freight is to be damaged
- Its value (especially if it’s high-dollar or perishable)
- Whether it poses safety risks
Think electronics, wine, or anything fragile higher risk = higher class.
The 18 Official Freight Classes (Quick Guide)
Here’s a simplified look at all the freight classes:
|
Class |
Density Range (lbs per cubic ft) |
Typical Freight Examples |
|
50 |
≥ 50 |
Bricks, metal parts, heavy machinery |
|
55 |
35–50 |
Hardware, tile, steel rods |
|
60 |
30–35 |
Bagged cement, canned goods |
|
65 |
22.5–30 |
Car parts, industrial supplies |
|
70 |
15–22.5 |
Books, flooring, pumps |
|
77.5 |
13.5–15 |
Tools, fixtures |
|
85 |
12–13.5 |
Furniture, small appliances |
|
92.5 |
10.5–12 |
Electronics, packaged goods |
|
100 |
9–10.5 |
Bottled liquids, plastics |
|
110 |
8–9 |
Home goods, mixed freight |
|
125 |
7–8 |
Electronics, household items |
|
150 |
6–7 |
Bicycles, lighting fixtures |
|
175 |
5–6 |
Clothing, artwork |
|
200 |
4–5 |
Mattresses, fragile goods |
|
250 |
3–4 |
Foam, assembled furniture |
|
300 |
2–3 |
Large signs, fragile display items |
|
400 |
1–2 |
Lightweight, bulky items |
|
500 |
<1 |
Very low density, very high value |
Important Note: Some items may have pre-assigned classes regardless of density (e.g., hazardous materials or regulated goods).
How Freight Class Affects Your LTL Shipping Costs: Now we get to the real talk.
Higher Class = Higher Cost: It’s that simple. For LTL carriers, space is money. They want to move the heaviest and densest loads in the most efficient way possible.
|
Freight Class |
Cost to Ship 1 Pallet (500 miles) |
|
55 |
$110 |
|
85 |
$145 |
|
125 |
$185 |
|
250 |
$260 |
|
400 |
$340 |
As you can see, freight class can double or triple your shipping cost. Misclassifying Freight = Extra Charges: If you guess your freight class and guess wrong? You might get hit with a reclassification fee (also called a “reclass”). This happens when the carrier measures or weighs your shipment and realizes it doesn’t match what you declared. And yes, they will charge you the difference; plus a penalty. Lesson? Know your class. Or ask your 3PL to help you get it right.
How to Calculate Freight Class for Your Shipment
Want to avoid overpaying or getting hit with reclassification fees? Here’s how to estimate your freight class:
: Measure Your Shipment: Get the length, width, and height (in inches) of the palletized load, including overhang.
2: Weigh It: Use an accurate scale to get the total shipment weight (including the pallet or packaging).
3: Calculate Volume and Density Use this formula: Density = (Weight in pounds) ÷ (Cubic feet of space) Convert cubic inches to cubic feet: (Length × Width × Height) ÷ 1,728 = Cubic feet
Step 4: Match Density to Class Table Use a freight class density chart to estimate your class range. Or plug it into an online freight class calculator (many carriers and 3PLs offer this for free).
Pro Tips to Lower Your Freight Class (and Cost)
1. Increase Density Whenever Possible
- Use tighter packaging
- Remove unnecessary void space
- Stack pallets if safe and allowed
- Choose compact crates over large boxes
Denser freight = lower class = lower rates.
2. Use Standard Pallet Sizes: Odd-sized pallets = less stackability = higher class. Stick to 48″ x 40″ standard pallets whenever you can.
3. Crate or Wrap Fragile Items Carriers will assign higher classes to fragile or hard-to-handle items. A well crated load might qualify for a lower class and better protection.
4. Let Your 3PL Do the Math Working with a freight broker or 3PL?
- Properly calculate class
- Find NMFC codes
- Consolidate freight to increase density
- Avoid surprise reclasses
It’s worth the extra layer of protection.
What Is an NMFC Code and Why Does It Matter? NMFC = National Motor Freight Classification code. It’s a unique identifier assigned to specific types of freight, used to standardize how goods are classified and priced.
- Think of it like a product’s SKU but for freight.
- Carriers use it to verify your class and rate.
- Incorrect NMFC codes lead to—you guessed it—reclass fees.
You can find NMFC codes:
- On the NMFTA website (subscription required)
- From your 3PL
- In your carrier’s LTL guide
What If You’re Still Not Sure About Your Freight Class? Here’s what to do:
- Ask your freight broker or 3PL
- Use a freight class calculator
- Request a freight inspection from your carrier
- Consider paying for a Freight Class Verification service
Better safe than sorry—because guessing wrong can cost you. So, how do freight classes affect LTL shipping costs? In a word? Significantly. Your freight class is one of the biggest pricing levers in LTL shipping. Understanding how it’s calculated—and how to optimize it—can help you:
- Lower your costs
- Avoid reclassification fees
- Improve delivery efficiency
- Build a smarter, leaner supply chain
Whether you’re shipping everyday products or complex freight, knowing your freight class is like knowing your credit score; it can make or break the deal. And remember, when in doubt: wrap it tight, weigh it right, and check the class twice. Your shipping budget will thank you.