US LTL Freight Class Density Scale Changed in July 2025, Many Calculators Outdated

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The National Motor Freight Traffic Association rewrote the density scale used to determine freight class for most US less-than-truckload shipments, effective July 19, 2025. The revised scale expanded from 11 to 13 density-based classes, and many commodities that once carried a fixed class now classify by density alone. The developer of CheckFreightClass reports that numerous online calculators still rely on the old table, some even producing a class 500 result that the current scale cannot generate. The article explains that density is calculated by dividing weight by volume, including pallets and overhang, and recommends classing each piece individually rather than blending densities. It also advises shippers to verify outputs against published test cases, since boundary values are where calculators most often diverge.

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