Multiply length x width x height in inches, divide by 1,728 to get cubic feet, then divide the weight in pounds by the cubic feet. A 48 x 40 x 45 in. pallet weighing 450 lb is 50 cubic feet and 9.00 pounds per cubic foot, which falls in the class 100 tier of the NMFC density scale.
This calculator does the density math for LTL freight. Enter each handling unit’s dimensions and weight and it returns the cube, the total weight, the density in pounds per cubic foot and the tier that density falls in on the NMFC density scale that took effect on July 19, 2025. Use it to sanity-check a quote, compare packaging options or spot freight that will rate high because it is light for its size.
How to Use the Freight Class Calculator
- Choose inches or centimeters, and pounds or kilograms.
- Enter the greatest length, width and height of one handling unit, including the pallet and any overhang.
- Enter the weight of one handling unit and the number of identical units.
- Read the density and the educational class, then confirm the NMFC item for your commodity before booking.
If a shipment has different pallet sizes, run each size separately: density is figured per handling unit.
How RapidShips Calculates This
- Formula
- cube (ft³) = L x W x H (in) ÷ 1,728density (lb/ft³) = weight (lb) ÷ cube (ft³)
- Units
- Metric entries are converted with exact factors (1 in = 2.54 cm, 1 lb = 0.45359237 kg) before the math, so inches and centimeters give the same answer.
- Class reference
- The density is matched to the 13-tier density scale adopted by NMFC Docket 2025-1, effective July 19, 2025. Tier boundaries follow the published wording, for example “8 but less than 10” pcf.
- Assumptions
- Every handling unit in the count is the same size and weight. Dimensions are the greatest straight-line measurements including projections, as NMFTA describes.
- Limitations
- Freight class is set by the NMFC item for the commodity, based on density, handling, stowability and liability. Many items use density; some do not. The result is a reference, not a classification.
The 2025 NMFC Density Scale
NMFC Docket 2025-1 expanded the standard density scale from 11 to 13 subprovisions and added classes 55 and 50 for dense freight.[1][3] When you calculate, your tier is highlighted below.
| Subprovision | Density (lb per ft³) | Class |
|---|---|---|
| Sub 1 | Less than 1 | 400Your result |
| Sub 2 | 1 but less than 2 | 300Your result |
| Sub 3 | 2 but less than 4 | 250Your result |
| Sub 4 | 4 but less than 6 | 175Your result |
| Sub 5 | 6 but less than 8 | 125Your result |
| Sub 6 | 8 but less than 10 | 100Your result |
| Sub 7 | 10 but less than 12 | 92.5Your result |
| Sub 8 | 12 but less than 15 | 85Your result |
| Sub 9 | 15 but less than 22.5 | 70Your result |
| Sub 10 | 22.5 but less than 30 | 65Your result |
| Sub 11 | 30 but less than 35 | 60Your result |
| Sub 12 | 35 but less than 50 | 55Your result |
| Sub 13 | 50 or greater | 50Your result |
Does Freight Density Determine Freight Class?
Often, but not always. NMFTA assigns every commodity a class from 50 to 500 based on four transportation characteristics: density, handling, stowability and liability.[4] For items classed by density, the class comes straight from a scale like the one above. For others, fragility, handling needs or value set the class and density plays a smaller role. That is why the result here is labeled educational: it tells you where your density falls, not which NMFC item your product belongs to.
If the class on the bill of lading does not match the freight, the carrier can correct it, which usually changes the charge. Checking the NMFC item before you ship avoids that surprise.
Worked Example
Four pallets, each 48 x 40 x 45 in. and 450 lb including the pallet:
- Cube per pallet: 48 x 40 x 45 = 86,400 in³ ÷ 1,728 = 50.00 ft³
- Density: 450 lb ÷ 50 ft³ = 9.00 lb/ft³, which is Sub 6 (8 but less than 10 pcf), class 100 on the density scale
- Shipment totals: 200.00 ft³ and 1,800 lb
This matches the handling-unit example NMFTA publishes for a 48 x 40 x 45 in., 450 lb pallet.[2]
What Can Change Your Density
Density goes up when the same weight takes less space. Tighter pallet builds, removing empty space in cartons, or consolidating partial pallets can all raise it, while overhang, tall light stacks and oversized pallets lower it. If freight arrives badly built, freight rework and pallet rebuilding can fix the build before it moves on. Confirm with your carrier how the NMFC item for your commodity is classed before you change packaging for rating reasons.
Frequently Asked Questions
What is freight density?
Does freight density determine freight class?
What changed in the NMFC density scale in 2025?
Should I include the pallet in the dimensions and weight?
How do I calculate density for pallets of different sizes?
Related Freight Tools
Related Guides and Services
Sources
- National Motor Freight Traffic Association (NMFTA), “Disposition Bulletin 1371, Notice of Disposition: Docket 2025-1 (PDF),” accessed September 2026.
- NMFTA Help Center, “How is the density of a handling unit calculated?,” accessed September 2026.
- NMFTA Help Center, “NMFC Changes FAQ: density and class breaks for the new 13 sub-structure,” accessed September 2026.
- NMFTA, “What is Freight Class? (NMFC),” accessed September 2026.
This page is general information, not a freight classification or tariff advice. NMFC rules change; confirm the current item and class with your carrier or NMFTA.