LTL Freight Class Calculator (Density-Based)
Enter your shipment dimensions and weight to estimate NMFC freight class using standard density breakpoints.
Formula used: Density = Total Weight (lb) ÷ Total Volume (cu ft), where Volume = (L × W × H × Pieces) ÷ 1728.
What is freight class?
Freight class is a standardized way to price less-than-truckload (LTL) shipments. In the U.S., carriers use NMFC (National Motor Freight Classification) categories to estimate cost and handling complexity. Most classes range from 50 (typically lower cost) to 500 (typically higher cost).
While several factors can affect final class—like liability, handling, and stowability—density is one of the most common starting points. That is exactly what this calculator estimates.
How this freight class calculator works
1) Measure shipment dimensions
Enter length, width, and height in inches for each pallet or shipping unit. Use the longest points, including overhang and packaging.
2) Enter total pieces and total weight
Input the number of pieces/pallets and total shipment weight in pounds. The calculator computes cubic feet, then calculates density in pounds per cubic foot (PCF).
3) Match density to class
The tool maps your density to commonly used NMFC density-based classes:
| Density (lb / cu ft) | Estimated Freight Class |
|---|---|
| 50 or greater | Class 50 |
| 35 to < 50 | Class 55 |
| 30 to < 35 | Class 60 |
| 22.5 to < 30 | Class 65 |
| 15 to < 22.5 | Class 70 |
| 13.5 to < 15 | Class 77.5 |
| 12 to < 13.5 | Class 85 |
| 10.5 to < 12 | Class 92.5 |
| 9 to < 10.5 | Class 100 |
| 8 to < 9 | Class 110 |
| 7 to < 8 | Class 125 |
| 6 to < 7 | Class 150 |
| 5 to < 6 | Class 175 |
| 4 to < 5 | Class 200 |
| 3 to < 4 | Class 250 |
| 2 to < 3 | Class 300 |
| 1 to < 2 | Class 400 |
| Less than 1 | Class 500 |
Why freight class matters
- Pricing: Lower class often means lower cost per hundredweight.
- Quoting accuracy: Correct class helps avoid reclassification charges.
- Transit planning: Better package data improves carrier acceptance and dispatch speed.
Common mistakes that increase shipping costs
- Using estimated dimensions instead of measured dimensions.
- Forgetting pallet height after stretch wrap is applied.
- Entering per-piece weight instead of total shipment weight.
- Ignoring non-density factors like fragile handling or hazardous materials.
Pro tips for better LTL quotes
If possible, increase density by reducing unused air space in cartons, consolidating cartons onto denser pallets, or selecting packaging that improves stackability. Also keep records of previous BOLs and carrier audits so future quotes stay accurate.
Important note
This tool gives a practical estimate. Carriers can still assign a different class based on commodity type and NMFC item rules, plus handling, liability, or stowability concerns. Always verify with your carrier, broker, or tariff documentation for final billing class.