Results & Class Mapping
Determined NMFC freight class details:
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An NMFC class lookup establishes the correct freight classification for Less-Than-Truckload (LTL) shipments based on commodity density. Calculating measurements prevents freight re-billing adjustments from carriers.
Density Formula:
Density (PCF) = Weight (lbs) ÷ [(Length (in) × Width (in) × Height (in)) ÷ 1,728]
The NMFC Freight Classification System
National Motor Freight Classification (NMFC) is a standardized pricing index managed by the NMFTA [1]. LTL freight rates are tiered into 18 classes based on shipping characteristics (density, handling, stowability, liability) as mandated by FMCSA transport standards [2] and ASTM commercial shipping packaging methods [3].
Standard Density-to-Class Reference Matrix
| Shipment Density (PCF) | Freight Class | Representative Commodity |
|---|---|---|
| > 50 lbs/cu ft | Class 50 | Steel hardware, nuts & bolts, raw iron castings |
| 30.0 to 35.0 lbs/cu ft | Class 60 | Car parts, hand tools, electrical switches |
| 15.0 to 22.5 lbs/cu ft | Class 70 | Heavy pumps, motors, packaged books |
| 12.0 to 13.5 lbs/cu ft | Class 85 | Packed tires, canned food, sheet goods |
| 9.0 to 10.5 lbs/cu ft | Class 100 | Laptops, clothes, bulk boxed inventory |
| 7.0 to 8.0 lbs/cu ft | Class 125 | Chairs, monitors, large home appliances |
| 6.0 to 7.0 lbs/cu ft | Class 150 | Corrugated boxes, standard plastic pipes |
| 3.0 to 4.0 lbs/cu ft | Class 250 | Empty plastic bottles, large foam wraps |
| < 1.0 lbs/cu ft | Class 500 | Table tennis balls, feathers, air filters |
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