Freight class 125
A displayed density close to 8 can still belong to class 125.
6 to under 8 lb/ft³
The lower boundary of 6 lb/ft³ is included. Exactly 8 lb/ft³ enters class 100.
2025 density scale. Item confirmation required.
Where this class 125 example sits
Toward class 175: 7.5 − 6 = 1.5 lb/ft³ above the cutoff. The lower edge remains included. Toward class 100: 8 − 7.5 = 0.5 lb/ft³ to the next boundary.
A 480 lb load and a near-boundary weight
A finished 48 × 48 × 48 in handling unit has a volume of 64 ft³. At 480 lb, density is 7.5 lb/ft³ and the estimate is class 125.
For the same exact volume, 511.936 lb gives 7.999 lb/ft³. Rounding that result to 8 before the class lookup would put it in class 100 incorrectly. Only a true result of at least 8 reaches the next band; at this volume that begins at 512 lb.
| Scenario | Quantity × L × W × H; weight per unit | Total volume | Density | Class |
|---|---|---|---|---|
| 48 in cube at 480 lb | 1 × 48 × 48 × 48 in at 480 lb each | 64 ft³ | 7.5 lb/ft³ | 125 |
| Same cube at 511.936 lb | 1 × 48 × 48 × 48 in at 511.936 lb each | 64 ft³ | 7.999 lb/ft³ | 125 |
| Same cube at exactly 512 lb | 1 × 48 × 48 × 48 in at 512 lb each | 64 ft³ | 8 lb/ft³ | 100 |
Hypothetical measurements. Calculator Methodology.
Compare the measured scenarios
Unrounded density; rounded display labels.
Precision cannot repair an incomplete footprint
If the 480 lb load extends to 50 in wide, its rectangular volume becomes about 66.667 ft³ and density falls to 7.2 lb/ft³. It remains class 125, but its distance from the 8 lb/ft³ boundary increases.
The three-decimal weight above is chosen to show a rounding edge, not to claim a scale can weigh a shipment that precisely. Use the accuracy supported by the actual measurement equipment and resolve carrier measurement rules before relying on a boundary result.
At 480 lb, change the envelope instead of the weight
A true 48 × 48 × 45 in unit occupies 60 ft³ and reaches 8 lb/ft³. The near-boundary weight example above keeps the larger cube and answers a different question.
| Boundary density | Target volume | Total height | Class at boundary |
|---|---|---|---|
| 8 lb/ft³ | 60 ft³ | 45 in | 100 |
Arithmetic target; confirm safe packaging.
Questions before you ship
Can the calculator display 8.000 but keep class 125?
Yes, if a value just below 8 rounds to 8.000 for display. The unrounded density controls the class. Reaching the exact lower boundary of class 100 is different from displaying a rounded value of 8.
Related density bands
Sources
Reviewed 2026-10-25: NMFTA scale; effective July 19, 2025; packaging margin (2026).
Last updated