What this calculator does
Find out which freight class your pallet is likely to fall in. Freight class is a number from 50 to 400 here that helps set the price of a shared truck shipment. A lower class usually means a lower rate.
Enter the pallet's size and weight. The calculator finds its density, which is how heavy each cubic foot is. It then reads the class from the NMFC density scale. NMFC stands for National Motor Freight Classification, the US system for grading freight.
That scale changed recently. The update took effect on July 19, 2025, and the standard scale grew to 13 steps, adding classes 55 and 50 for very dense freight.
Where it's used
Why this math matters outside the classroom:
- Small business shipping. A shop owner finds that a 500-pound, 48 by 40 by 48 inch pallet has a density of 9.375, which is class 100.
- Packing choices. A shipper cuts a pallet's height from 48 to 36 inches, which raises the density from 9.375 to 12.5 and the scale class to 85.
- Warehouse checks. A dock worker measures a 40-inch cube weighing 300 pounds and finds about 8.1 pounds per cubic foot, or class 100.
- Quote review. An office manager checks a carrier's class on a 1-cubic-foot, 50-pound box and finds that the density scale gives class 50.
How to use it
- Measure the longest length, width and height, with the pallet included.
- Enter the weight of that pallet or crate.
- Read the density and the class on the scale.
- Check the NMFC listing for your item before you book the shipment.
What the inputs mean
- Height
- Measure to the highest point of the load. Round up to the next whole inch if your carrier asks for it, because carriers check and can reclassify a shipment.
- Weight of this pallet or crate
- Include the pallet and packaging. For several pallets of different sizes, run each one on its own.
Formula and method
cubic feet = length × width × height ÷ 1,728 density = weight ÷ cubic feet class = the row of the density scale that holds your density
Length, width and height are in inches, and weight is in pounds. There are 12 × 12 × 12 = 1,728 cubic inches in a cubic foot, so dividing by 1,728 turns inches into cubic feet.
A dense load takes up less room for its weight, so carriers charge less per pound. That's why the highest density gets the lowest class. Each row includes its lower number and stops just before the next one.
Worked example
You're shipping a 48 by 40 by 48 inch pallet that weighs 500 pounds.
- Find the volume: 48 × 40 × 48 = 92,160 cubic inches.
- Convert it: 92,160 ÷ 1,728 = 53.33 cubic feet.
- Find the density: 500 ÷ 53.33 = 9.38 pounds per cubic foot (9.375 before rounding).
- That's in the row for 8 but less than 10.
Result: The density-based class is 100.
Understanding the result
This is the class the density scale gives. It's your starting point, not the final word. Many items have their own NMFC listing, and that listing decides.
The scale is meant for freight with no special problems. Items that are hard to handle, hard to load around or easily damaged can be listed at a different class.
A wrong class can bring a reclassification charge from the carrier, so check before you ship.
Assumptions and limitations
- It uses the 13-step scale printed in the NMFTA notice for Docket 2025-1, effective July 19, 2025.
- NMFTA, the National Motor Freight Traffic Association, publishes the NMFC. Later dockets may change listings for individual items.
- It treats your load as one pallet or crate. Density is normally worked out for each one.
- It doesn't look up your item's NMFC number. That requires NMFTA's paid lookup tools or your carrier.
- We did not check every docket since 2025, so a newer rule could change the result for your item.
- Carriers may use their own pricing rules. Your freight quote or carrier decides the final class.
Frequently asked questions
What changed in the NMFC in 2025?
Docket 2025-1 took effect on July 19, 2025. It moved many items to density-based listings using a standard 13-step scale that reaches classes 55 and 50.
Is density the only thing that sets a class?
No. NMFTA looks at density, handling, stowability (how well it loads with other freight) and liability (how likely it is to be damaged or cause damage).
Why is the top class 400 here, when classes go to 500?
The 13-step density scale tops out at class 400 for loads under 1 pound per cubic foot. A specific item's listing can set a different class.
Should I use the density of one pallet or the whole shipment?
NMFTA's guidance says each handling unit, such as a pallet, is usually worked out on its own. A total can be used only in limited cases, so ask your carrier.
Sources
- NMFTA: Disposition Bulletin 1371, Docket 2025-1 (checked 2026-10-31)
- NMFTA: 2025 NMFC changes FAQ (checked 2026-10-31)
How this calculator is checked
Method: Scale read from NMFTA Disposition Bulletin 1371 (Docket 2025-1), the 13-subprovision density table repeated throughout the bulletin. The official FAQ web page returned 403, but the FAQ PDF and bulletin were read. Handling-unit wording is from the FAQ PDF. The calculation is covered by automated tests with known reference values and edge cases. Last updated 2026-10-31. Found a problem? Tell us.
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