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Stop overpaying for LTL shipments. Calculate your exact density (PCF) and determine your estimated NMFC freight class before booking a truck.
Disclaimer: This calculator provides an estimated density-based Freight Class. While density is the primary factor, the official NMFC class also considers stowability, handling, and liability. Always verify with your carrier.
The NMFC establishes 18 different freight classes (from Class 50 to Class 500). While Density is the most common metric, class is officially determined by four characteristics.
The primary factor. It represents Pounds per Cubic Foot. High density (heavy and compact) = lower class. Low density (light and bulky) = higher class.
How easily can the freight be packed with other freight? Items that are awkwardly shaped, excessively long, or cannot have other pallets stacked on them may be bumped to a higher class.
Standard pallets are easily moved with a forklift. Freight that requires special equipment, excessive manpower, or extreme care will carry a higher freight class.
The risk of theft, damage to the cargo, or damage to adjacent cargo. Highly valuable items (electronics) or hazardous materials represent higher liability to the carrier, resulting in a higher class.
Length × Width × Height = Total Cubes in InchesTotal Cubic Inches ÷ 1728 = Cubic Feet (ft³)Weight (lbs) ÷ Cubic Feet = PCFFreight class is a standardized LTL pricing category that helps carriers quote shipping costs based on handling difficulty and space efficiency. For most shipments, density (PCF) is the biggest pricing lever, but class can also be affected by stowability, handling complexity, and liability risk.
This matters because class errors trigger re-weigh and re-class fees, causing invoice surprises and margin erosion. Calculating class correctly before tendering freight improves quote accuracy and reduces dispute risk.
Cubic Feet = (L x W x H in inches) / 1728
Converts pallet dimensions into the volume carriers use for density billing.
PCF = Total Weight (lbs) / Cubic Feet
Higher PCF generally maps to lower freight classes and lower rates per pound.
Dims: 48 x 40 x 40 in
Weight: 1,200 lbs
PCF: ~27.0
Likely lower class, often favorable LTL pricing.
Dims: 48 x 40 x 72 in
Weight: 700 lbs
PCF: ~8.75
Mid-range class, commonly sensitive to dimensional changes.
Dims: 96 x 48 x 84 in
Weight: 500 lbs
PCF: ~2.15
High class risk and premium rate per pound due to low density.
| Density (PCF) | Typical Class Range | Rate Tendency | Optimization Focus |
|---|---|---|---|
| < 4 | High (e.g., 250-400+) | Expensive | Compress packaging and reduce cube. |
| 4 - 8 | Moderate-high | Moderate-expensive | Tighten pallet footprint and stack height. |
| 8 - 15 | Middle classes | Balanced | Improve dimension accuracy on BOL. |
| > 15 | Lower classes | More favorable | Maintain stable palletization and compliance. |
| Density (PCF) | Typical Class Range | Rate Tendency | Optimization Focus | | --- | --- | --- | --- | | < 4 | High (e.g., 250-400+) | Expensive | Compress packaging and reduce cube. | | 4 - 8 | Moderate-high | Moderate-expensive | Tighten pallet footprint and stack height. | | 8 - 15 | Middle classes | Balanced | Improve dimension accuracy on BOL. | | > 15 | Lower classes | More favorable | Maintain stable palletization and compliance. |
NMFC stands for National Motor Freight Classification. It is a standardized method published by the NMFTA (National Motor Freight Traffic Association) used to provide a uniform pricing structure when shipping LTL (Less Than Truckload) freight across different carriers.
This is usually due to a "Re-weigh and Re-class". If a carrier measures your pallet on their warehouse scales and laser dimensions and finds the Density (PCF) is different from what was stated on the Bill of Lading (BOL), they will legally update the class and bill you the difference.
Class 50 is generally the cheapest possible rate per pound. Class 50 items are dense, heavy, and easy to safely stack on a truck (like a pallet of bricks). Class 500 is the most expensive; these items are very light but take up massive amounts of space on a truck (like a pallet of fully inflated ping-pong balls) or are exceptionally fragile or valuable.
No. This calculator estimates your class strictly based on Density (PCF). While Density is the driving factor for most freight, the official NMFC guidelines also evaluate three other factors: Stowability, Handling, and Liability. An item that is dense but extremely fragile might be bumped to a higher class.
You must measure and weigh each pallet individually. The calculator allows you to add multiple items or pallets to determine the total shipment PCF, which is usually how a carrier will evaluate a multi-pallet LTL shipment.
FAK is an agreement between a shipper and carrier allowing multiple products with different true NMFC classes to be billed under one single, unified class (e.g., shipping everything at class 70). It heavily simplifies billing for companies shipping diverse products.
Yes! The carrier measures the extreme outer dimensions of the entire shipping unit. This includes the full height of the pallet itself, any overhang of the boxes, and the extreme length and width.
For cylindrical freight, carriers calculate the dimensions by "squaring it off". They measure the maximum diameter and treat that as both the Length and Width. This empty space is calculated because a barrel takes up a square footprint on the truck.
To lower your class, you must increase your density. You can do this by packing boxes tighter, removing empty space from packaging, stacking pallets higher (if safe), or dismantling items to ship them flat-packed.
No. Dimensional Weight (DIM weight) is used by parcel carriers like FedEx and UPS for small packages. Freight Class is a specialized classification system used exclusively by LTL (Less Than Truckload) motor carriers.
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