📦 Freight Class Calculator
Enter your shipment dimensions and weight to find the NMFC freight class for LTL shipping quotes.
How LTL Freight Classes Work
The National Motor Freight Classification (NMFC) system assigns freight classes from 50 to 500. Lower classes (denser freight) cost less to ship per pound; higher classes (lighter, bulkier, or more fragile freight) cost more. Class is primarily determined by density (weight ÷ cubic feet).
To calculate density: convert dimensions from inches to feet (divide each by 12), multiply to get cubic feet, then divide the weight in pounds by the cubic feet. The result maps directly to a freight class range.
Always verify your class with your carrier — some commodities have NMFC-assigned classes regardless of density (e.g., electronics, hazmat, or fragile items).