22.5 - 30 pcf · NMFC density scale
The rating for freight at 22.5 - 30 pounds per cubic foot on the current 13-band NMFC density scale. Typically bottled drinks, boxed car parts, packaged food.
Class 65 covers the 22.5 - 30 pcf band, which catches a lot of everyday industrial freight: bottled beverages, boxed automotive parts, dense packaged food. The band is wide at 7.5 pcf, so most shipments sit comfortably inside it rather than on an edge.
Worked example. A standard pallet: 48 × 40 × 40 in, 1150 lb. That is 44.4 cu ft and 1150 lb → 25.88 pcf → class 65. Run your own numbers →
Band edges are inclusive at the bottom, exclusive at the top: exactly 22.5 pcf is class 65, but just below it the class gets more expensive — 22.49 pcf rates class 70. A few pounds of packaging or an inch of pallet height can move a borderline shipment across that line.
Freight class runs from 50 (densest, cheapest per pound) to 400 on the current density scale. Class 65 is band 4 of 13.
Either side of this band: denser freight (30 - 35 pcf) rates class 60, which is cheaper; lighter freight (15 - 22.5 pcf) rates class 70, which costs more.
The full table is on the freight class chart, and the calculator works out density and class from your dimensions, including multi-pallet shipments.