Freight Class Calculator
Determine your NMFC freight class from pallet dimensions and weight. Calculates density, class 50–500, and estimated shipping cost. Free online tool.
About This Calculator
The Freight Class Calculator helps shippers, logistics professionals, and small business owners determine the correct NMFC (National Motor Freight Classification) class for their LTL (Less Than Truckload) shipments. Simply enter your pallet dimensions and weight to get an instant freight class classification based on density, along with estimated shipping costs.
This calculator uses the official NMFC density table published by the National Motor Freight Traffic Association (NMFTA). Freight class is determined by calculating the density of your shipment in pounds per cubic foot (lb/cu ft). The NMFC system assigns class numbers from 50 (dense freight) to 500 (light, bulky freight). Higher density shipments receive lower class numbers and are generally cheaper to ship per pound. The formula is: Density = Weight (lbs) ÷ Volume (cu ft), where Volume = Length × Width × Height / 1728 (for imperial inches).
Regional Notes
United States: The NMFC system is the standard for all domestic LTL shipping in the US, regulated by the NMFTA. All major carriers (FedEx Freight, UPS Freight, XPO, Old Dominion, etc.) use NMFC classes for rating. This calculator follows the latest NMFC density-based classification table. Note that hazardous materials, oversized items, and certain commodities may have special item-specific NMFC numbers that override the density class.
Canada: Canadian LTL shipping uses a similar but not identical classification system. Canadian carriers often reference NMFC classes but may apply their own adjustments and surcharges. Confirm with your Canadian carrier before finalizing classification.
UK/Europe: The UK and EU do not use the NMFC system. European LTL shipping typically uses weight-based or volume-based pricing (e.g., chargeable weight calculated as actual weight vs. volumetric weight). Use this calculator for reference only if shipping internationally to the US.
Frequently Asked Questions
What is freight class and how is it determined?
Freight class is a standardized shipping category under the National Motor Freight Classification (NMFC) system used for LTL (Less Than Truckload) shipping. It is primarily determined by the density of your shipment in pounds per cubic foot. Denser cargo gets a lower class number (e.g., Class 50) and is cheaper to ship per pound, while lightweight bulky cargo gets a higher class number (e.g., Class 500) and costs more per pound.
How do I calculate freight class from pallet dimensions?
To calculate freight class, first find the volume of your pallet by multiplying length times width times height. For imperial units, divide cubic inches by 1728 to get cubic feet. Then divide the weight in pounds by the volume in cubic feet to get density in lb/cu ft. Finally, compare your density to the NMFC density table — denser shipments receive lower class numbers. For example, a 260 lb pallet measuring 36 × 48 × 60 inches has a density of 4.33 lb/cu ft, which corresponds to Class 200.
What are the NMFC freight class numbers and their density ranges?
NMFC freight classes range from 50 to 500 based on density. Class 50 is for shipments over 50 lb/cu ft (densest, cheapest per pound). Classes step up as density decreases: 55 (35-50), 60 (30-35), 65 (22.5-30), 70 (15-22.5), 77.5 (13.5-15), 85 (12-13.5), 92.5 (10.5-12), 100 (9-10.5), 110 (8-9), 125 (7-8), 150 (6-7), 175 (5-6), 200 (4-5), 250 (3-4), 300 (2-3), 400 (1-2), and Class 500 for shipments under 1 lb/cu ft (least dense, most expensive per pound).
Is the freight class based on NMFC the same in all countries?
No, the NMFC (National Motor Freight Classification) system is specific to the United States. Canada uses a similar system but with some variations in class numbers and rules. Other countries have their own freight classification systems or use simpler weight-based pricing. This calculator follows the US NMFC standard as published by the National Motor Freight Traffic Association (NMFTA).
Can I lower my freight class to save money?
Yes, you can potentially lower your freight class by increasing the density of your shipment. If your density is just below the threshold for the next class (e.g., 7.98 lb/cu ft for Class 125 vs 8.0 lb/cu ft for Class 110), adding a small amount of weight or reducing the volume through better packaging can push you into a more favorable class. Always optimize packaging to minimize empty space and maximize density.
What factors besides density affect freight class?
While density is the primary factor, the NMFC system also considers stowability (how easily the freight fits on a truck), handling (special equipment needed), and liability (value, perishability, fragility). Some items have a specific NMFC item number that overrides the density-based class. Always check with your carrier for the exact classification of your specific commodity.
How does freight class affect shipping costs?
Freight class directly impacts your LTL shipping costs. Carriers apply a base rate that is multiplied by a class factor — lower classes (like Class 50) have a lower multiplier, while higher classes (like Class 500) have a higher multiplier. This means denser, lower-class freight is cheaper to ship per pound. For example, shipping a Class 50 pallet might cost $0.25/lb while a Class 400 pallet could cost $2.00/lb, a significant difference.
What is the difference between NMFC class and freight class?
NMFC class and freight class refer to the same concept. The National Motor Freight Classification (NMFC) system is maintained by the NMFTA and assigns a class number from 50 to 500 to every type of freight shipped in the US. The class number is based on density, handling, stowability, and liability. When someone asks for a 'freight class', they are nearly always referring to the NMFC classification.