Question 1

How is freight class calculated?

Accepted Answer

For density-based items, divide the shipment weight (lb) by its volume (cubic feet, including the pallet and packaging). The resulting pounds per cubic foot maps to a class on the NMFC density scale — the denser the freight, the lower the class and usually the lower the rate.

Question 2

Did the freight class rules change in 2025?

Accepted Answer

Yes. The NMFC moved many items to a density-based 13-tier scale effective July 19, 2025. This calculator uses that scale. Some commodities still have a fixed class in their NMFC item, so always check the item number for your product.

Question 3

What happens if I use the wrong freight class?

Accepted Answer

The carrier can re-weigh and re-measure your shipment and bill a reclassification fee plus the higher rate. Measuring the full pallet (height to the top of the load) prevents most surprises.

Question 4

Does freight class matter for full truckload?

Accepted Answer

No. Freight class is used for LTL (less-than-truckload) pricing. Full truckload is priced by lane, equipment and market rates.

Density (lb per ft³)	Freight class
50 or more	50
35 – 50	55
30 – 35	60
22.5 – 30	65
15 – 22.5	70
12 – 15	85
10 – 12	92.5
8 – 10	100
6 – 8	125
4 – 6	175
2 – 4	250
1 – 2	300
Less than 1	400

Freight class calculator

NMFC density scale (effective July 19, 2025)

How to use the result

Frequently asked questions

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