Freight class is a standardized rating (1 to 500) set by the National Motor Freight Classification (NMFC) system that groups LTL shipments by density, stowability, handling difficulty, and liability. The lower the class number, the denser and easier to handle the freight — and generally, the cheaper it ships.
How Freight Class Is Determined
Four factors set your class: density (weight relative to size), how easily the freight stows next to other shipments, how much special handling it needs, and the carrier's liability risk if it's damaged or stolen. A pallet of steel bar stock and a pallet of pillows might weigh the same, but they will not ship at the same class.
Why Freight Class Changes Your Rate
LTL carriers price by class because it estimates how much trailer space and handling effort a shipment actually consumes relative to its weight. A low-density shipment (class 300+) takes up trailer space without much weight to justify it, so it costs more per pound to move than something dense and easy to stack (class 50-85).
What Happens If Your Class Is Wrong
Carriers physically inspect and reweigh LTL freight at their terminals. If the declared class doesn't match what's actually on the pallet, the carrier reclassifies the shipment and rebills the difference — sometimes well after the shipment has already delivered. This is the single most common reason an LTL invoice doesn't match the original quote.
How to Get Your Freight Class Right the First Time
Weigh and measure the actual pallet, not an estimate. If you're unsure how a product classifies, the NMFC guide or your broker can confirm it before the quote is issued. Getting this right upfront avoids both an unpleasant reclass bill and repeat disputes over the same product every time you ship it.
IZY Logistics is a licensed freight broker (MC #1615290) happy to walk through any charge or term on your invoice.
Get a Free Quote →Frequently Asked Questions
Is freight class the same for every carrier?
Yes — freight class is a standardized national system (NMFC), not something each carrier sets independently. However, individual carriers can apply their own discounts or minimums on top of the base class rate.
Can two identical-looking pallets have different freight classes?
Yes, if their density differs. Packaging, dunnage, and how tightly a product is packed all affect density, so two similar-looking shipments of different products can land in different classes.
Who decides the freight class on my shipment?
The shipper declares the class at booking based on the product's NMFC classification, but the carrier can re-inspect and correct it at the terminal if it doesn't match.
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