A freight class calculator works out the density of your LTL shipment in pounds per cubic foot and matches it to an NMFC freight class. One 48 × 40 × 48 inch pallet weighing 500 pounds has a density of 9.38 PCF, which is class 100 on the 13-tier scale in effect since July 19, 2025.
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How to use the freight class calculator
- Enter the pallet length, width and height in inches, including the pallet.
- Enter the number of identical pallets.
- Enter the total shipment weight in pounds, including pallets and packaging.
- Read the density and freight class, and the full density table.
What formula does the freight class calculator use?
- Volume per pallet (cubic feet) = length × width × height in inches ÷ 1,728
- Total volume = volume per pallet × number of pallets
- Density (pounds per cubic foot, PCF) = total weight ÷ total volume
- Freight class = the class for that density on the NMFC 13-tier scale
Measure the pallet with the freight on it, at its longest, widest and highest points, and include the pallet’s weight and height. Carriers measure the same way, so leaving the pallet out understates the volume and can lead to a reclass charge.
NMFC density scale (effective July 19, 2025)
| Density (PCF) | Class |
|---|---|
| 50 or more | 50 |
| 35 to under 50 | 55 |
| 30 to under 35 | 60 |
| 22.5 to under 30 | 65 |
| 15 to under 22.5 | 70 |
| 12 to under 15 | 85 |
| 10 to under 12 | 92.5 |
| 8 to under 10 | 100 |
| 6 to under 8 | 125 |
| 4 to under 6 | 175 |
| 2 to under 4 | 250 |
| 1 to under 2 | 300 |
| under 1 | 400 |
The National Motor Freight Traffic Association expanded its standard density scale from 11 to 13 tiers in Docket 2025-1, effective July 19, 2025. Density is now the main factor for many commodities, but items with special handling, stowability or liability concerns keep a class set by their NMFC item, so check the item number for your goods.
Freight class calculator worked example
| Pallet | Pallets | Weight | Cubic feet | PCF | Class |
|---|---|---|---|---|---|
| 48×40×48 in | 1 | 500 lb | 53.33 | 9.38 | 100 |
| 48×40×40 in | 1 | 1,000 lb | 44.44 | 22.50 | 65 |
| 48×40×60 in | 1 | 300 lb | 66.67 | 4.50 | 175 |
| 48×40×48 in | 2 | 1,600 lb | 106.67 | 15.00 | 70 |
| 48×48×72 in | 1 | 250 lb | 96.00 | 2.60 | 250 |
A standard 48 × 40 inch pallet stacked 48 inches high is 92,160 cubic inches, or 53.33 cubic feet. At 500 pounds the density is 9.38 PCF, which falls in the 8 to under 10 band, so the freight class calculator gives class 100.
Why freight class matters
Less-than-truckload (LTL) carriers use class as one input to price a shipment. A higher class means lighter, bulkier freight that takes more trailer space for its weight, so it usually costs more per hundred pounds. Class also affects liability limits on some tariffs. Putting the wrong class on the bill of lading does not save money for long: carriers inspect and measure freight, and if the class is wrong they reclassify it and bill the difference, often with a fee.
How to lower your freight class
- Stack tighter. Less empty space on the pallet raises density.
- Use the right pallet size. Overhanging or oversized pallets add volume without weight.
- Combine items. Heavier and lighter items on one pallet can average to a lower class, if the carrier rates the pallet as one piece.
- Avoid tall, unstackable loads. Carriers may charge for space a load blocks, even if it is not filled.
Multiple pallets
For several identical pallets, enter the size of one pallet and the number of pallets, plus the total weight. If pallets differ in size, work out the volume of each, add them and divide the total weight by the total volume, or rate them separately if they will be billed as separate pieces. The freight class calculator assumes identical pallets.
Estimates for planning only, not legal, tax or financial advice. Check carrier, card network, lender and state rules before relying on a figure.
Getting the bill of lading right
The bill of lading should describe the goods accurately, with the NMFC item number where one applies, the number of pieces, the total weight and, increasingly, the dimensions. Carriers use this information to plan loads and price the shipment. If the freight class calculator result and the class on the bill do not match, the carrier will usually go by its own inspection. Keeping a record of how you measured and weighed each shipment makes it easier to challenge a reclass you think is wrong.
Some shippers agree a fixed class with a carrier for regular freight, known as a freight-all-kinds (FAK) arrangement. Even then, run the freight class calculator now and then: if your packaging or products change, the density can move into a different band, and a pricing agreement may no longer match the freight you send.
Related converters and calculators
Related calculators:
- Dimensional weight calculator: parcels
- Trucking cost per mile calculator: carrier costs
- Density calculator: density
- Volume calculator: volume
Sources
NMFTA: Docket 2025-1 Disposition Bulletin (13-tier density scale); NMFTA: NMFC classification FAQs.
Questions about this calculator
How is freight class calculated?
Divide the weight by the volume in cubic feet to get density, then look up the class on the NMFC scale.
What class is a 500 lb pallet 48×40×48?
About 9.38 PCF, which is class 100.
When did the 13-tier scale start?
July 19, 2025, under NMFC Docket 2025-1.
Does every item use density?
No. Items with handling, stowability or liability concerns keep the class of their NMFC item.
Should I include the pallet?
Yes. Measure and weigh the shipment as it will be tendered, pallet included.
Check the assumptions and units before relying on a result. Financial, tax and health estimates do not replace advice for your individual circumstances.
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