How Freight Class Works: Density, the BOL and Your LTL Price
Here is how freight class works: the NMFC puts every LTL shipment in one of 18 classes from 50 to 500, mostly by density, and lower classes cost less. You measure the packaged freight, divide pounds by cubic feet, and write the class on the bill of lading. If the carrier inspects and finds a different class, it rebills at the correct one and adds fees.
How is an LTL freight class decided?
The NMFC (National Motor Freight Classification) decides LTL freight class using four factors: density, stowability, handling and liability. Since the 2025 NMFC changes, density drives most classes.
Stowability covers freight that cannot stack or has an odd shape. Handling covers fragile or awkward pieces that need extra care. Liability covers value and the risk of damage, theft or harm to nearby freight. Freight that scores badly on these can land in a higher class than its density alone suggests.
An NMFC item number names the commodity. The freight class is the rating attached to it. Both belong on the shipping paperwork.
How do you calculate freight density?
Freight density is total pounds divided by total cubic feet, measured on the packaged shipment with the pallet included.
Example: a 48 by 40 inch pallet stacked 48 inches high is 92,160 cubic inches, or 53.33 cubic feet. At 1,000 pounds, density is 18.75 pounds per cubic foot, which falls in class 70. The freight class calculator runs the same math for several pallets at once.
- Measure length, width and height in inches at the widest and tallest points, including the pallet and any overhang.
- Multiply the three numbers and divide by 1,728 to get cubic feet.
- Weigh the full shipment on a scale, not from a spec sheet.
- Divide pounds by cubic feet to get freight density.
- Match that density to the class band in the NMFC.
Should you use an NMFC commodity entry or a density based class?
Use the specific NMFC item when the commodity has one that is not density based; use the density scale when the item points to density or no specific entry fits.
Some products, such as certain hazmat, high value or hard to handle goods, keep a fixed class regardless of weight. To check, look up the exact product as packaged, not the general category. A crated machine and the same machine loose on a skid can rate differently. Ask the carrier or broker to confirm the item number before pickup, and keep that confirmation with the quote.
How freight class works in the final LTL price
Class picks the rate column, but the bill is the carrier's base rate for the lane, times the weight, minus any discount, plus fuel surcharge and accessorials.
The base rate depends on origin and destination zip codes and the class. Heavier shipments usually earn a lower rate per hundred pounds. Carriers apply a negotiated discount, then add a fuel surcharge that moves with diesel prices. Accessorials cover anything beyond dock to dock service. More on how shared loads are priced is on the partial and LTL service page.
- Liftgate at pickup or delivery
- Residential or limited access delivery
- Inside delivery
- Delivery appointment or call ahead
- Reweigh and reclassification fees after inspection
What triggers a reclassification, and what does it cost?
Carriers reclassify when their own scale or dimensioner shows different numbers than the BOL, or when the description does not match the freight on the dock.
Common triggers are guessed weights, measuring the box but not the pallet, ignoring overhang, stacking freight that cannot be stacked, and vague descriptions like "parts" or "supplies." The result is a corrected invoice at the new class and weight, plus inspection or reweigh fees. Disputes can hold up billing and slow claims. A correct BOL is cheaper than any correction.
What should the BOL and the quote request include?
Send the same facts for the quote that will go on the bill of lading, so the price and the paperwork match.
The BOL is the contract of carriage, the receipt for the goods and the document of title. The driver signs it at pickup. The receiver signs at delivery, and that signed copy is the proof of delivery. For hazmat, include the required hazmat details. Answers to other paperwork questions are on the freight questions page.
- Shipper, consignee and who pays the freight
- Pickup and delivery addresses, hours and dock or liftgate needs
- Pallet or piece count and packaging type
- Packaged dimensions of each piece, in inches
- Total weight from a scale
- A plain commodity description, NMFC item number and freight class
- Hazmat details and any special instructions
When freight class stops mattering
Freight class applies to LTL; partial and full truckloads are usually priced by lane, weight and trailer space instead. A partial stays on one truck with one or two other shipments, usually 6 to 18 pallets or 5,000 to 30,000 pounds, with no terminal handling. A full truckload is one shipper's freight door to door.
Lifetime Logistics Services LLC arranges LTL and partial loads through vetted carriers and runs its own 53 foot dry vans from Southern California, and the quote form or (562) 566-8953 gets a firm price.
| Density (pounds per cubic foot) | Freight class | Typical freight | Price effect |
|---|---|---|---|
| 50 or more | 50 | Dense, compact loads | Lowest class rate |
| 15 to 22.5 | 70 | Dense palletized goods | Low |
| 6 to 7 | 125 | Light, bulky cartons | Higher |
| Under 1 | 500 | Light, bulky items | Highest class rate |
From our own loads
Our dispatch records for the 12 months to October 2026, every lane we ran. Ranges, not counts, so no customer can be picked out.
- Trailers
- about 8 in 10 dry van, about 1 in 10 flatbed, about 1 in 10 power only, the rest box truck, sprinter van and hot shot
- Typical transit
- 1 day
- Busiest months
- October and May
- Hauled by
- mostly partner carriers we vet
Questions shippers ask
- Who is responsible for the class and measurements, and who pays if the carrier changes them?
- The shipper is responsible for an accurate description, weight, dimensions and class on the BOL. A broker can help check the numbers, but the carrier has the final say after inspection. The party paying the freight usually pays the corrected charges and fees.
- How early should you request an LTL quote or book pickup?
- Request the quote as soon as the freight is packed and measured, and book at least a day ahead when you can. Transit time depends on the lane, the carrier's terminal network and pickup cutoffs. Rural or remote points can add days.
- What if the dimensions are uncertain or the shipment mixes commodities?
- Measure after final packing, not before. For mixed commodities, list each item with its own weight, dimensions and class on the BOL, or confirm with the carrier whether one class applies. Unusual packaging, like crates or loose pieces, should be described exactly before pickup.
- How do you dispute a reclassification?
- Ask the carrier for the inspection report, photos and scale or dimensioner readings. Compare them with your own measurements, photos of the packed freight and any written class confirmation. Submit the dispute in writing within the carrier's deadline. Good records before pickup make disputes short.
- Is a freight class calculator result final?
- No. A calculator gives the density class from the numbers you enter, which is a strong starting point. It cannot see a specific NMFC item that overrides density, or handling and liability issues. Confirm the commodity entry before you print the BOL.
- Does lowering the class by repacking actually save money?
- Often it does. Tighter packaging, fewer empty spaces and stackable pallets raise density and can drop the shipment into a lower class. Check that the repacked freight still travels safely, because damage claims and handling problems can cost more than the savings.
Measure the packed freight, weigh it on a scale, confirm the NMFC item, and put the same numbers on the quote and the BOL. That habit prevents most reclassification bills.
Ready to price a load?
Send the quote form or call us. Quotes within 15 minutes, Monday to Friday 6 AM to 6 PM Pacific; operations team available 24/7 for active loads.