US Freight Class Calculator
Determine NMFC freight class based on density. Calculate pounds per cubic foot, estimate shipping costs, and optimize your LTL shipments.
US Freight Class Calculator
Accurately determine your NMFC freight class based on dimensions, weight, and commodity type. Optimize shipping costs and avoid reclassification fees.
The National Motor Freight Classification (NMFC) is a standardized system that categorizes commodities for shipping. Developed by the National Motor Freight Traffic Association (NMFTA), it provides a uniform method for describing freight and establishing shipping rates.
18 Classes
From Class 50 (most dense) to Class 400 (least dense)
Density-Based
Primary factor is pounds per cubic foot
Cost Impact
Lower class = lower per-hundredweight rate
NMFC Item Numbers
Each commodity has a specific NMFC code
| Class | Density Range | Cost Factor | Typical Items |
|---|---|---|---|
| Class 50 | 50+ lbs/cu ft | 1.00x (Base) | Steel bars, engine blocks, lead ingots |
| Class 55 | 35-50 lbs/cu ft | 1.05x | Bricks, cement, lumber, hardware |
| Class 60 | 30-35 lbs/cu ft | 1.10x | Auto parts, beverages, canned goods |
| Class 65 | 22.5-30 lbs/cu ft | 1.15x | Bottled products, books, ceramics |
| Class 70 | 15-22.5 lbs/cu ft | 1.20x | Furniture, appliances, car parts |
| Class 85 | 12-13.5 lbs/cu ft | 1.40x | Crated machinery, small appliances |
| Class 92.5 | 10.5-12 lbs/cu ft | 1.50x | Computers, refrigerators |
| Class 100 | 9-10.5 lbs/cu ft | 1.60x | Canvas, wood cabinets, boat covers |
| Class 125 | 7-8 lbs/cu ft | 1.90x | Small appliances, dresses |
| Class 150 | 6-7 lbs/cu ft | 2.10x | Auto sheet metal, bookcases |
| Class 200 | 3-4 lbs/cu ft | 2.60x | Aircraft parts, mattresses |
| Class 300 | 1-2 lbs/cu ft | 3.30x | Wicker furniture, wine tanks |
| Class 400 | <1 lbs/cu ft | 3.80x | Ping pong balls, styrofoam |
While density is the primary factor, NMFC considers four characteristics when determining the appropriate freight class:
1. Density
Primary FactorPounds per cubic foot determines the base freight class. Higher density items have lower classes and lower shipping costs.
2. Stowability
20% WeightCan other freight be loaded on top or around your shipment? Items that can't be stacked or loaded with other goods may have higher classes.
3. Handling
15% WeightSpecial handling requirements like fragility, hazardous materials, or unusual shapes can increase freight class.
4. Liability
15% WeightHigh-value items, perishables, or fragile goods have higher liability and may be assigned higher freight classes.
Measure Accurately
Always use actual dimensions. Carriers will measure and reclassify if dimensions don't match.
Optimize Packaging
Use smaller boxes and eliminate void fill to increase density and lower your freight class.
Calculate Before Shipping
Know your density and class before getting quotes to avoid unexpected reclassification fees.
Know Your NMFC Code
Find the correct NMFC item number for your commodity to ensure accurate classification.
Consolidate Shipments
Combine smaller shipments into larger, denser loads to achieve better freight classes.
Use Standard Pallets
Standard 48×40 pallets are easier to stack and maximize trailer space utilization.
Using Wrong NMFC Code
Incorrect classification can result in reclassification fees, delayed shipments, and billing disputes with carriers.
Estimating Dimensions
Carriers use dimensioners to measure every shipment. Guessing leads to unexpected charges and disputes.
Ignoring Density
Not calculating density beforehand can result in surprise class changes and higher-than-expected costs.
Overlooking Handling Requirements
Failing to declare special handling needs can lead to damage claims and additional fees.