Freight Density Calculator
Enter the dimensions and weight of a packaged handling unit to get its density in pounds per cubic foot — the figure NMFC freight class is derived from.
650 lb ÷ 55.556 ft³ = 11.70 lb/ft³ — subprovision 7 (10 but less than 12 pcf), density class 92.5.
The calculation, and why it is worth a page of its own
Density is weight divided by volume: multiply length by width by height in inches, divide by 1,728 to reach cubic feet, then divide the total weight by that. Carriers care about it because a trailer runs out of space long before it runs out of weight capacity. Freight that fills space without adding weight costs a carrier the revenue of whatever else could have been in that space.
It is worth isolating from the class calculation because density is the number you can actually change. You cannot argue a class down, but you can rebuild a pallet. Every inch of unnecessary height is volume with no weight behind it, dragging the ratio toward a more expensive subprovision.
Worked example
A 48" × 40" pallet built to 50", weighing 650 lb.
Volume: 48 × 40 × 50 = 96,000 in³ ÷ 1,728 = 55.56 ft³.
Density: 650 ÷ 55.56 = 11.70 lb/ft³ — subprovision 7 (10 but less than 12 pcf), class 92.5.
What a few inches is worth
Take the same 650 lb and compress it from 50" to 42" tall. Density rises from 11.70 to 13.93 lb/ft³, moving it from subprovision 7 to 8 — class 92.5 down to class 85. Same goods, same weight, eight inches.
Density thresholds worth knowing
These are the boundaries where a class actually changes. If a shipment lands within a pound or two below one, it is worth re-checking the build before the bill of lading goes out.
| Reach this density | Class becomes |
|---|---|
| 10 lb/ft³ | 92.5 |
| 12 lb/ft³ | 85 |
| 15 lb/ft³ | 70 |
| 22.5 lb/ft³ | 65 |
| 30 lb/ft³ | 60 |
| 35 lb/ft³ | 55 |
| 50 lb/ft³ | 50 |
Keep going
- Density is only half the answer — the freight class calculator maps that number onto its NMFC subprovision and the class carriers rate from. Freight Class Calculator
- Density is fixed by how tightly the pallet is built; the pallet calculator shows how many cases fit in the same footprint, which is the lever that moves density. Pallet Calculator
Frequently Asked Questions
What is freight density and why does it matter?
Freight density is the weight of a packaged handling unit divided by the space it occupies, in pounds per cubic foot. Since the NMFC moved to density-based classification in July 2025 it is the primary input to freight class, and freight class is what an LTL carrier prices from. It is also the number a carrier recalculates when it re-measures a pallet on the dock.
Do I include the pallet in the measurement?
Yes. Density is calculated on the handling unit as the carrier receives it, which means the pallet deck, the product, the shrink wrap and any overhang. A standard pallet adds roughly 5 to 6 inches of height, and leaving it out overstates density enough to move a shipment into the wrong subprovision.
How do I convert cubic inches to cubic feet?
Divide by 1,728. A cubic foot is 12 × 12 × 12 inches, so 92,160 cubic inches (a 48 × 40 × 48 pallet) is 53.33 cubic feet.
What density do I need to hit a lower freight class?
The thresholds that matter most in practice are 15 lb/ft³ (class 70), 22.5 (class 65), 30 (class 60), 35 (class 55) and 50 (class 50). If a shipment sits just below one of these, reducing pallet height or consolidating onto fewer pallets can push it over and drop the class.
Does density change if I ship more pallets?
No, as long as the pallets are identical. Density is a ratio, so doubling both the volume and the weight leaves it unchanged. Enter the handling-unit count and the total weight and the result is the same as for a single unit.
Related Calculators
- Freight Class Calculator — Freight Classification
- CBM Calculator — Dimensions & Weight
- Dimensional Weight Calculator — Dimensions & Weight
- Chargeable Weight Calculator — Dimensions & Weight