Freight Class Examples
Class 65 for 1000 lb at 42x42x36 in
Class 65 is the density-based estimate for 1000 lb at 42 x 42 x 36 inches because the complete handling unit calculates to 27.21 pounds per cubic foot.
Full density and class calculation
The outside envelope contains 42 x 42 x 36 = 63,504 cubic inches. Dividing by 1,728 converts that envelope to 36.75 cubic feet. Dividing the gross packaged weight of 1000 pounds by 36.75 cubic feet gives 27.21 pcf. The current density table places 27.21 pcf in the 22.5 to under 30 pcf band, which produces the class 65 screening result shown above.
42 x 42 x 36 / 1,728 = 36.75 ft3; 1000 / 36.75 = 27.21 pcf; density estimate = class 65.
Nearest freight class boundaries
At this exact footprint and height, the lower edge of the current band corresponds to 826.9 pounds. A decrease of about 173.1 pounds would reach that edge and can move the density estimate toward the next higher class number. The upper edge corresponds to 1102.5 pounds. An increase of about 102.5 pounds would reach the higher-density edge and can move the estimate toward the next lower class number.
The same boundaries can be expressed as height changes while holding 1000 pounds and the 42 x 42 inch footprint constant. A packaged height near 32.7 inches reaches 30 pcf, while a height near 43.5 inches reaches 22.5 pcf. Decreasing height raises density; increasing height lowers density. Measure the final wrapped load rather than choosing a favorable nominal carton height.
| Boundary | Weight at current size | Height at current weight |
|---|---|---|
| 22.5 pcf | 826.9 lb | 43.5 in |
| 30 pcf | 1102.5 lb | 32.7 in |
What changes the answer
If the entered 36 inch height omitted a 5.6 inch pallet base, including that base would produce 23.55 pcf and a density estimate of class 65. Two inches of combined length and width overhang would produce 24.79 pcf and class 65. Two additional inches of shrink wrap, corner board, or top projection would produce 25.78 pcf and class 65. These comparisons show why the greatest tendered dimensions control the arithmetic.
How stable is this estimate?
This combination sits nearer the middle of its density band than either edge. A small rounding difference is less likely to change the band immediately, but an omitted pallet, material overhang, or a meaningful weight change can still alter the estimate. The boundary values above show the size of change required.
Decision profile for this exact load
The square 42 x 42 inch footprint covers 1,764 square inches, 8.1% less area than a 48 x 40 pallet, so substituting a standard-pallet footprint would change the density calculation. None of the three packaging corrections tested on this page changes the class 65 density result. The closest band edge is 2.79 pcf from the calculated density, and the load sits 62.8% of the way from the 22.5 pcf edge to the 30 pcf edge.
Four-factor NMFC caveat
NMFC classification is not determined by density alone. The four transportation characteristics are density, stowability, handling, and liability. A commodity item, packaging rule, unusual handling need, poor stowability, or liability characteristic can override this density-only estimate and lead to a different official class.
Use the current NMFTA ClassIT+ record or qualified classification guidance to confirm the governing item and rules. Freight Totals is independent of NMFTA and carriers, and this page is a planning calculation rather than an official classification or rate.
Sources
- NMFTA: NMFC 13-Sub Density and Class BreaksSource record 2026-08-13. Density-based NMFC provisions only
- NMFTA: How is the density of a handling unit calculated?Source record 2026-08-12. LTL handling-unit measurement