Guides to freight classification, density calculation and LTL pricing. Plain English, specific enough to act on.
The full density-to-class table behind this site's calculators, with methodology, sourcing and a downloadable CSV.
View data →How the 18 NMFC classes work, why lower class means cheaper freight, and how carriers use class to set LTL rates.
Read →The density method step by step, with a worked example showing the full calculation from dimensions to class number.
Read →Weight divided by cubic feet gives PCF. That number maps to an NMFC class. See the formula and a full worked example.
Read →NMFC item numbers, what they are, when they override the density-based class, and how to use them on a bill of lading.
Read →All 18 NMFC freight classes, the density range each covers, and typical goods that fall into each one.
Read →How freight class sets the per-cwt rate, what the difference between class 50 and class 300 looks like in dollars, and the practical ways to lower your class.
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