Prepare Density Inputs for Freight Classification
The Freight Classification Calculator is an NMFC decision assistant. Enter commodity, packaging, dimensions, handling units, weight and handling conditions, and it returns density in pounds per cubic foot, the indicated freight class under the 13-break density scale, reclassification risk, accessorial requirements, recommended mode and trailer, and quote complexity. It does not publish rates and it is not a final NMFC determination; a coordinator verifies classification and pricing in writing.
NMFC decision assistant
Shipment information
Freight classification questions
How is freight class calculated?
Cubic feet equals length x width x height per handling unit, multiplied by units, divided by 1,728. Density equals total weight divided by total cubic feet. The resulting pounds per cubic foot maps to a class on the 13-break density scale, from Class 50 at 50 lb/ft³ and above down to Class 400 and below at very low density.
Is the indicated class the same as an NMFC class?
No. Density is the starting point. The published NMFC item, packaging, stowability, handling and liability characteristics can move the final class. Provide the NMFC item number when you know it so the classification can be verified.
Why does reclassification happen after pickup?
Carriers inspect and reweigh freight. Wrong dimensions, missed stacking restrictions, unlisted accessorials or a density near a break point are the most common causes of a corrected invoice.
Can I save or share the analysis?
Yes. Every analysis produces a crawlable results page with the shipment profile in the URL, so it can be bookmarked, shared with a coordinator or printed to PDF.
Sources, review status and limitations
How this page is maintained
- Sources reviewed
- Carrier tariffs, NMFTA classification concepts, port authority publications, FMCSA guidance
- Last reviewed
- 2026-07-25
- Data year
- 2026
- Reviewed by
- FreightShippingNow freight operations editorial team
- Claim limitations
- No rates, rankings, transit times or capacity availability are guaranteed on this page.
- Provider role
- Freight coordination and brokerage-style arrangement of transportation; carrier services are performed by licensed motor carriers.
- Change notice
- Operational information, terminal procedures and accessorial rules are subject to change.