LTL Freight Class, Explained Without the Jargon

Short answer: freight class is a 50-to-500 rating based on density, handling, stowability and liability, and it's a key input to your LTL rate. Dense, compact freight gets a low class and a lower rate. Light, bulky or hard-to-handle freight gets a high class. For many items, you can work out the class yourself from weight and dimensions, as shown below.

Freight class is the rating the National Motor Freight Classification (NMFC) gives LTL freight, and for a growing share of items it is set by density: pounds per cubic foot. On the NMFC's standard density scale, dense freight at 50 PCF or more is class 50 and very light freight under 1 PCF is class 400. Work out your density before you quote and the class stops being a surprise.

The calculation is arithmetic you can do with a tape measure and a calculator. It's worth doing, because on class-rated LTL the class feeds the linehaul rate, and a wrong number on the bill of lading is a common cause of reclassification. This is what class measures, how to compute density, and what happens when the carrier's measurement disagrees with yours.

What freight class actually measures

The NMFC is published by the National Motor Freight Traffic Association (NMFTA). Each commodity has an NMFC item, and that item carries a class. Low classes go to dense, compact freight that packs tightly; high classes go to light, bulky freight that takes up trailer space without much weight. On the standard density scale, the class falls step by step as density rises, from class 400 below 1 PCF to class 50 at 50 PCF and above.

Density is not the only consideration. NMFTA's guidance on the 2025 changes notes that items with unique handling, stowability and liability considerations are marked as such, so a commodity can carry a class that density alone would not predict. But for many items density does most of the work, and the 2025 changes moved more items onto density scales. That is why a good first step is to identify your commodity's NMFC item, then check whether that item is classed by density.

How class turns into dollars

LTL rates are commonly quoted per hundred pounds (a hundredweight or "cwt" rate), and NMFTA describes density as a factor that affects both "freight classification and pricing." On class-rated freight, the class is one of the inputs used to look up that rate. It is one input among several, though. What you actually pay depends on the carrier's tariff or your negotiated contract, discounts, minimum charges, fuel surcharge and any accessorials such as liftgate or appointment delivery. Our guide to accessorial charges covers what triggers each one, and what a freight quote actually prices shows how the pieces stack up.

That's why getting class right matters in both directions. Overstate it and your freight is rated at a class it doesn't need. Understate it, deliberately or by guessing, and NMFTA warns that you "risk reclassifications, back charges, or shipping delays."

The density math, with a worked example

NMFTA defines density as the weight of the shipment divided by its volume, in pounds per cubic foot, and tells shippers to include pallets and packaging. The formula:

• Cubic feet = (length × width × height, in inches) ÷ 1,728
• Density = total weight in pounds ÷ cubic feet

Worked example: a machine on a 48” × 40” pallet, standing 48” tall with packaging, weighing 350 lb including the pallet.

• 48 × 40 × 48 = 92,160 cubic inches ÷ 1,728 = 53.3 cubic feet
• 350 lb ÷ 53.3 ft³ = 6.6 lb per cubic foot

If the machine's NMFC item is classed on the standard density scale, 6.6 PCF falls in the 6-to-under-8 band, class 125. Now see what packaging does: crate the same machine into a 48” × 40” × 30” box and the cube drops to 33.3 ft³, density rises to 10.5 PCF, and on the same scale the class falls to 92.5. Density is a pricing input you partly control. Pallet choice matters too; see our standard pallet sizes reference for common footprints.

The standard density breaks NMFTA published for the 2025 changes, for orientation:

Density (PCF)	Freight class
Less than 1	400
1 to under 2	300
2 to under 4	250
4 to under 6	175
6 to under 8	125
8 to under 10	100
10 to under 12	92.5
12 to under 15	85
15 to under 22.5	70
22.5 to under 30	65
30 to under 35	60
35 to under 50	55
50 or more	50

These breaks apply to items classed on that scale. An item with its own listing, or with handling, stowability or liability provisions, can rate differently, so confirm the item before you rely on the table.

The 2025 changes: more items rated by density

NMFTA's changes took effect on July 19, 2025. According to NMFTA, the 11-sub density scale was replaced by a more detailed 13-sub scale, over 2,000 items moved to full density-based classification, many generic NMFC headings were consolidated, and items with unique handling, stowability and liability considerations are now clearly marked. NMFTA also launched ClassIT+, a digital classification tool.

If your product moved onto a density scale, its class can now change with how you package it. NMFTA's advice to shippers is to review their most commonly shipped LTL items, update internal systems with the new item numbers and density scales, and work with their carriers on classification.

Why freight gets reclassified, and how to avoid it

Carriers may inspect, reweigh or re-measure freight, and NMFTA notes that some shippers use dimensioners less accurate than the carriers'. If the carrier's measurement doesn't support the class on your bill of lading, the freight can be reclassified and back-charged. Whether an inspection or reweigh fee applies, and how much, depends on the carrier's tariff and your terms.

NMFTA lists the mistakes it often sees: default dimensions taken from old records, pallet or packaging height left out, measurements rounded too generously, less accurate dimensioners, and irregular items treated as standard boxes. The fixes follow from that list:

1. Measure after packaging, not before. Include the pallet and packaging in both the dimensions and the weight. Weigh the finished pallet rather than estimating what the pallet adds, since pallet weight varies with size and construction.
2. Measure to the inch. That is NMFTA's own advice. If your carrier's tariff or contract sets a rounding rule, use it.
3. Check the item, not just the math. NMFTA recommends double-checking your NMFC item in ClassIT+ for the correct density-based class ranges.
4. Photograph the finished pallet with a tape measure visible. If a correction looks wrong, you have a record to support a dispute.
5. Put the real numbers on the BOL. The carrier works from the bill of lading, so the weight, dimensions and NMFC item there should match what you measured.

When freight class stops mattering

Class exists to price freight that shares a trailer on class-rated LTL. Move the same freight on a dedicated vehicle and the rate is built differently. On DirectXpress's own same-day and final mile runs within Southern California, the quote works from pallet count, weight and dimensions, the lane, and any liftgate, appointment or inside placement you select, as on our same-day freight service in Los Angeles. Weight and dimensions decide the truck; freight class comes in on LTL lanes.

DirectXpress holds both broker and motor carrier authority. The same quote form covers both: within Southern California it prices a same-day or final mile run on our own trucks, and for lanes leaving the region it prices nationwide LTL through our partner carrier network. Send full pickup and delivery addresses, pallet count or piece dimensions, total weight and a description of the commodity. Complex lanes go to a dispatcher, who replies with pricing, typically within one business hour.

FAQ: LTL freight class

How do I choose the right freight class for LTL shipments?

Start with what you're shipping, not the math. Find the commodity's NMFC item, then check whether that item is classed by density; NMFTA's ClassIT+ tool is built for this. If it is, weigh and measure the finished pallet including packaging, divide weight by cubic feet, and read the class off the density table above. If the item has its own listing or carries handling, stowability or liability provisions, use the class that item lists. Put the NMFC item, class, weight and dimensions on the bill of lading, and ask your carrier or broker to confirm if you're unsure.

How do carriers calculate dimensional weight for LTL freight?

Class-rated LTL is built around density rather than a parcel-style dimensional weight divisor. The carrier takes the greatest length, width and height of the shipment including pallet and packaging, converts to cubic feet by dividing cubic inches by 1,728, then divides total weight by that volume to get pounds per cubic foot. In our example, 53.3 ft³ at 350 lb is 6.6 PCF, or class 125 on the standard scale. Some carrier tariffs add their own rules for very bulky freight, so check your contract or ask the carrier how it measures.

How do you calculate LTL freight rates?

LTL rates are commonly quoted per hundred pounds (cwt). The carrier looks up a rate using the freight class, the weight and the origin and destination lanes, then applies your discount from its tariff or contract. Minimum charges, the fuel surcharge and accessorials such as liftgate or appointment delivery are added on top. We don't publish a standard rate because it depends on the lane and the carrier. The fastest way to see a real number is to send addresses, pallet count or dimensions, weight and commodity through the quote form.

What are the LTL freight class codes and what does each class mean?

Classes run from 50 to 500, and the lower the class, the denser and easier to ship the freight. On the standard density scale in this post, the classes are 50, 55, 60, 65, 70, 85, 92.5, 100, 125, 175, 250, 300 and 400. Class 50 is very dense freight at 50 PCF or more; class 400 is freight under 1 PCF. Items with unique handling, stowability or liability considerations can carry a class that density alone wouldn't predict, so the item's own NMFC listing wins over the table.

What freight class is a standard pallet?

There's no single answer, because class belongs to the commodity's NMFC item, not to the pallet. If the item is classed on the standard density scale, a 48×40 pallet at 48” tall (53.3 ft³) would rate class 70 at 800 lb (15.0 PCF), class 125 at 350 lb (6.6 PCF) and class 250 at 150 lb (2.8 PCF). Confirm the item first, then weigh and measure the finished pallet.

Can I just guess a low class to get a cheaper quote?

You can put any class on a bill of lading, but if the carrier's inspection or measurement doesn't support it, NMFTA warns of reclassifications, back charges or delays. Any fee on top depends on the carrier's tariff and your terms. A guessed class can turn a known price into a later adjustment.

What's the difference between freight class and NMFC code?

The NMFC item number identifies what the commodity is; the class is the rating that item carries, and for density-based items it depends on the density you ship at. NMFTA's 2025 guidance tells shippers to update their systems with the new item numbers and density scales, so it helps to keep both on file.

Does freight class apply to same-day or dedicated shipments?

Class is used to price class-rated LTL. DirectXpress quotes its own same-day and final mile runs from pallet count, weight and dimensions, the lane and selected accessorials, with freight class applying on LTL lanes. If you use another provider, ask how they price a dedicated vehicle.

How do I find the density if my freight isn't rectangular?

The common approach is straight dimensioning: the greatest length, width and height, including packaging and pallet. NMFTA notes that some carrier contracts permit it but that it can misstate density for irregular, stackable or oddly shaped freight, so check your NMFC item and your carrier's rules.

Who is responsible if the class on the BOL is wrong?

Two different questions. The shipper supplies the description, weight and dimensions, so accuracy starts there. Who pays a correction depends on the payment terms on the bill of lading and on your contract with the carrier or broker, so check those terms before you ship.