Work out freight class from density in pounds per cubic foot using the thirteen-subprovision NMFC density scale that took effect on 19 July 2025, and see exactly how much weight or cube you would need to reach the next class down.
| Input | Result |
|---|---|
| 48×40×48 in pallet, 800 lb | 15.0 lb/ft³ → sub 9, class 70 |
| 48×40×40 in pallet, 310 lb | 7.0 lb/ft³ → sub 5, class 125 |
| two 14×14×96 in rolled rugs, 58 lb each | 5.3 lb/ft³ → sub 4, class 175 |
| four 120×100×150 cm pallets, 320 kg each | 11.1 lb/ft³ → sub 7, class 92.5 |
| Sub | Density (lb per cubic foot) | Freight class | Note |
|---|---|---|---|
| 1 | 0.0 but less than 1.0 | 400 | |
| 2 | 1.0 but less than 2.0 | 300 | |
| 3 | 2.0 but less than 4.0 | 250 | |
| 4 | 4.0 but less than 6.0 | 175 | |
| 5 | 6.0 but less than 8.0 | 125 | |
| 6 | 8.0 but less than 10.0 | 100 | |
| 7 | 10.0 but less than 12.0 | 92.5 | |
| 8 | 12.0 but less than 15.0 | 85 | |
| 9 | 15.0 but less than 22.5 | 70 | |
| 10 | 22.5 but less than 30.0 | 65 | |
| 11 | 30.0 but less than 35.0 | 60 | |
| 12 | 35.0 but less than 50.0 | 55 | new in 2025 |
| 13 | 50.0 or more | 50 | new in 2025 |
Effective 19 July 2025 under NMFTA Docket 2025-1, which replaced the eleven-subprovision scale. Subs 12 and 13 (classes 55 and 50) are new, dense freight got cheaper overnight. Each band is inclusive at the bottom and exclusive at the top: NMFTA writes the ranges as “but less than”, so exactly 15.0 lb/ft³ is sub 9, class 70, not sub 8, class 85.
If the density chart you are working from runs up to class 500 across eighteen levels, it describes the system as it stood before July 2025. The NMFC still contains eighteen class levels from 50 to 500, but the density scale itself now uses only thirteen of them and stops at class 400. Classes 77.5, 110, 150, 200 and 500 remain valid in the NMFC for commodities classified on handling, stowability or liability rather than density, they are simply no longer reachable through density.
This page uses the thirteen-subprovision table as published by the National Motor Freight Traffic Association in its own guidance on the 2025 changes (checked 2026-10-15), not a third-party summary. The change is also not finished: NMFTA runs two dockets a year, so classes assigned to converted commodities can still move without your product changing at all.
NMFC classification has always rested on four transportation characteristics: density (weight against volume), handling (how hard it is to move across a dock), stowability (how well it loads with other freight) and liability (damage, theft and value risk). The 2025 revision made density the default for around two thousand commodity items with no special concerns. Items flagged for handling, stowability or liability keep their own class, and any commodity with a specific NMFC item number follows that item rather than the density table. Treat this calculator as the density answer and your NMFC item as the override.
Three habits cause most reclassification disputes, and all three cost money on a reweigh:
Forgetting the pallet. A standard deck is about 5.5 in tall. The carrier measures the handling unit as presented, so an unrecorded deck adds volume AND the pallet weight. Same for overhang past the pallet edge.
Rounding generously. Under the new scale a few tenths of a pound per cubic foot can cross a band boundary, and every fractional inch counts. Measure to the inch.
Using one piece to describe many. Density is total weight divided by total volume across all pieces in the shipment, pallets included. If pieces are mixed, enter them as one combined handling unit or the answer will not match the carrier’s.
Not affiliated. This is an independent calculator and is not affiliated with the NMFTA or any carrier. NMFC® and National Motor Freight Classification® are registered trademarks of the National Motor Freight Traffic Association, Inc., used here only to identify the standard being applied. Your carrier’s tariff and your bill of lading are the authoritative record.
Divide total weight in pounds by total volume in cubic feet to get density, then read the class off the thirteen-subprovision table. A 48×40×48 in pallet is 53.3 cu ft; at 800 lb that is 15.0 lb/ft³, which lands in sub 9, class 70. At 640 lb the same pallet is 12.0 lb/ft³ and moves to sub 8, class 85, one class worse, because lighter freight of the same size is more expensive to carry.
Yes, on 19 July 2025. NMFTA Docket 2025-1 replaced the eleven-subprovision density scale with a thirteen-subprovision one, and moved over two thousand commodity items to full density-based classification. The visible effect is at the dense end: classes 55 and 50 are now reachable by density, whereas the old scale stopped at class 60. Any chart you find that runs to class 500 across eighteen levels predates the change. It is also still moving, NMFTA issues two dockets a year, so a converted item can change class again.
Yes, and leaving it out is one of the most common and most expensive mistakes. Carriers measure the handling unit as presented: pallet deck, packaging and any overhang past the pallet edge. A standard deck is roughly 5.5 in, which on a 48×40 in pallet adds about 6 cu ft, enough on its own to push a borderline shipment into a worse class.
No. The NMFC classifies on four characteristics: density, handling, stowability and liability. Density is now the default for general freight with no special concerns, but items flagged for handling or liability keep their own class, and any commodity with a specific NMFC item number follows that item. Use the density answer, then check ClassIT+ or the current NMFC for the item.
Increase density: same weight in less cube, or the same cube carrying more weight. Cut the largest dimension first, since volume multiplies all three. Moving from 12.0 to 15.0 lb/ft³ on a 53.3 cu ft pallet takes only 160 lb more, and that single step is class 85 down to class 70. Repalletising to a tighter footprint without overhang is usually the cheapest saving available.
No. This is an independent calculator, not affiliated with the NMFTA or any carrier. NMFC® and National Motor Freight Classification® are registered trademarks of the National Motor Freight Traffic Association, Inc., named here only to identify the standard being applied. Your carrier’s tariff and the class on your bill of lading are the authoritative record, and a reweigh that changes the class changes the invoice.