Freight Class Calculator
How It Works
Freight class is the primary factor in determining LTL (Less Than Truckload) shipping costs. The National Motor Freight Classification (NMFC) system assigns classes from 50 (lowest cost) to 500 (highest cost) based on four characteristics: density, handling, stowability, and liability.
Density is the most important factor and is calculated as weight divided by volume in cubic feet. Higher density shipments get lower freight classes and cost less per pound to ship. A dense pallet of bricks might be Class 50, while lightweight foam might be Class 400.
Note that many commodities have specific NMFC codes that override density-based classification. This calculator provides a density-based estimate. Always verify with your carrier or freight broker for the exact classification of your commodity.
Frequently Asked Questions
What is the most common freight class?
Class 70 (density 15+ lbs/cu ft) and Class 85 (density 12+ lbs/cu ft) are among the most common for general merchandise. Food products, auto parts, and boxed goods often fall in the Class 55-85 range.
Does freight class affect shipping cost?
Yes, significantly. Moving from Class 100 to Class 70 can reduce freight charges by 20-40%. Lower classes mean denser, easier-to-handle freight that carriers prefer.
How can I lower my freight class?
Increase density by using smaller packaging, stacking items efficiently, and palletizing tightly. Some items can be reclassified with proper packaging. Applying for a density-based classification through the NMFTA may help.
What is the difference between freight class and commodity code?
Freight class (50-500) is the pricing category. NMFC commodity codes are specific 6-digit codes assigned to every type of product. The commodity code determines the freight class. Some items have fixed classes regardless of density.