Freight Class Examples
Class 100 for 500 lb at 48x48x42 in
Class 100 is the density-based estimate for 500 lb at 48 x 48 x 42 inches because the complete handling unit calculates to 8.93 pounds per cubic foot.
Full density and class calculation
The outside envelope contains 48 x 48 x 42 = 96,768 cubic inches. Dividing by 1,728 converts that envelope to 56.00 cubic feet. Dividing the gross packaged weight of 500 pounds by 56.00 cubic feet gives 8.93 pcf. The current density table places 8.93 pcf in the 8 to under 10 pcf band, which produces the class 100 screening result shown above.
48 x 48 x 42 / 1,728 = 56.00 ft3; 500 / 56.00 = 8.93 pcf; density estimate = class 100.
Nearest freight class boundaries
At this exact footprint and height, the lower edge of the current band corresponds to 448.0 pounds. A decrease of about 52.0 pounds would reach that edge and can move the density estimate toward the next higher class number. The upper edge corresponds to 560.0 pounds. An increase of about 60.0 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 500 pounds and the 48 x 48 inch footprint constant. A packaged height near 37.5 inches reaches 10 pcf, while a height near 46.9 inches reaches 8 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 |
|---|---|---|
| 8 pcf | 448.0 lb | 46.9 in |
| 10 pcf | 560.0 lb | 37.5 in |
What changes the answer
If the entered 42 inch height omitted a 5.6 inch pallet base, including that base would produce 7.88 pcf and a density estimate of class 125. Two inches of combined length and width overhang would produce 8.23 pcf and class 100. Two additional inches of shrink wrap, corner board, or top projection would produce 8.52 pcf and class 100. 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 48 x 48 inch footprint covers 2,304 square inches, 20.0% more area than a 48 x 40 pallet, so substituting a standard-pallet footprint would change the density calculation. 1 of the three packaging corrections tested on this page changes the density-based class result. The closest band edge is 0.93 pcf from the calculated density, and the load sits 46.4% of the way from the 8 pcf edge to the 10 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