Freight Class Calculator
Estimate NMFC freight class from shipment density, weight, and dimensions for LTL shipping quotes.
What Is Freight Class?
Freight class is a standardized rating used in less-than-truckload (LTL) shipping in the United States. The National Motor Freight Classification (NMFC) assigns classes from 50 to 500 based on shipment density in pounds per cubic foot.
How Freight Class Is Calculated
Measure your pallet or crate in feet, multiply length by width by height to get volume in cubic feet, then divide total weight in pounds by that volume. Higher density usually means a lower class number and often a lower rate per pound.
Pair this with the Dimensional Weight Calculator and CBM Shipping Calculator when planning international or volumetric shipments.
Frequently Asked Questions
What freight class is 4.33 lb/cu ft?
A density of 4.33 lb/cu ft falls in class 200, which covers densities from 4 to 5 lb/cu ft under the NMFC table.
Why does density determine freight class?
Denser cargo uses less trailer space per pound. Carriers price LTL freight partly on how efficiently a shipment fills a truck.
What is the lowest freight class?
Class 50 is the lowest standard class for very dense freight at 50 lb/cu ft or more. Class 500 applies to very light, bulky cargo under 1 lb/cu ft.
Can I lower my freight class?
Sometimes. Increasing weight slightly or reducing package volume can push density into a lower class bracket and reduce the rate per pound.
Is this the same as dimensional weight?
No. Dimensional weight is a billing method for parcel carriers. Freight class is an NMFC density rating used in LTL trucking.
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