Freight Class Examples
Class 55 for 1500 lb at 48x40x30 in
Class 55 is the density-based estimate for 1500 lb at 48 x 40 x 30 inches because the complete handling unit calculates to 45.00 pounds per cubic foot.
Full density and class calculation
The outside envelope contains 48 x 40 x 30 = 57,600 cubic inches. Dividing by 1,728 converts that envelope to 33.33 cubic feet. Dividing the gross packaged weight of 1500 pounds by 33.33 cubic feet gives 45.00 pcf. The current density table places 45.00 pcf in the 35 to under 50 pcf band, which produces the class 55 screening result shown above.
48 x 40 x 30 / 1,728 = 33.33 ft3; 1500 / 33.33 = 45.00 pcf; density estimate = class 55.
Nearest freight class boundaries
At this exact footprint and height, the lower edge of the current band corresponds to 1166.7 pounds. A decrease of about 333.3 pounds would reach that edge and can move the density estimate toward the next higher class number. The upper edge corresponds to 1666.7 pounds. An increase of about 166.7 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 1500 pounds and the 48 x 40 inch footprint constant. A packaged height near 27.0 inches reaches 50 pcf, while a height near 38.6 inches reaches 35 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 |
|---|---|---|
| 35 pcf | 1166.7 lb | 38.6 in |
| 50 pcf | 1666.7 lb | 27.0 in |
What changes the answer
If the entered 30 inch height omitted a 5.6 inch pallet base, including that base would produce 37.92 pcf and a density estimate of class 55. Two inches of combined length and width overhang would produce 41.14 pcf and class 55. Two additional inches of shrink wrap, corner board, or top projection would produce 42.19 pcf and class 55. 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 48 x 40 inch footprint matches a common North American pallet plan, so final wrapped height is the dimension most likely to be omitted from a nominal pallet description. None of the three packaging corrections tested on this page changes the class 55 density result. The closest band edge is 5.00 pcf from the calculated density, and the load sits 66.7% of the way from the 35 pcf edge to the 50 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