All eighteen freight classes.

Thirteen of them come from density, so the number depends on how your freight is packed. Five do not, and no density range exists for those — whatever the charts say.

The thirteen density classes

These come off the density scale in Docket 2025-1. Work out pounds per cubic foot and the class follows.

Sub	Density	Class	Example of freight that lands there
13	50+	50	Extremely dense metal products — tightly packed steel hardware, ingots, dense cast components.
12	35–50	55	Very dense metal products. Tightly packed steel parts, fasteners, heavy castings.
11	30–35	60	Heavy metal components — steel assemblies, castings, dense industrial parts.
10	22.5–30	65	Metal hardware and dense machine parts, in compact cartons or crates of steel components.
9	15–22.5	70	Dense industrial equipment, pumps and motors. Compact, heavy manufactured products.
8	12–15	85	Machinery components and heavier packaged goods — substantial product with relatively little empty space.
7	10–12	92.5	Palletized manufactured parts. Moderately dense finished goods.
6	8–10	100	Packaged appliances and equipment, boxed with some foam and void space around them.
5	6–8	125	Boxed household goods and small furniture components. Moderately bulky for what they weigh.
4	4–6	175	Lightweight plastic products — molded plastic housings, totes, light fixtures.
3	2–4	250	Pillows and comforters. Large cartons of lightweight bedding.
2	1–2	300	Foam products and lightweight cushions, shipped as bulky cartons of foam or padding.
1	0–1	400	Artificial flowers and lightweight decorative displays. A huge box with almost no weight in it.

The five that are not density classes

No density produces these. They are named by specific NMFC items, so a chart that gives them a pounds-per-cubic-foot range is making it up.

77.5 110 150 200 500

Work out your own class.

Enter dimensions and weight and the calculator gives you density and the class it lands in, on the current scale.

Freight class calculator Free NMFC check