Freight Class Calculator

Effective 19 July 2025 under Docket 2025-1. Each band includes its lower bound and excludes its upper bound, so exactly 8.00 lb/ft³ is class 100, not 125.

The NMFC still has eighteen class levels from 50 to 500, but the 13-sub density scale only produces thirteen of them. It tops out at 400 and skips 77.5, 110, 150, 200, and 500. Those five levels remain valid — they are simply assigned by individual NMFC items rather than by weight per cubic foot, usually because the freight carries a handling, stowability, or liability problem.

This is the most common source of wrong answers online. A chart that sends 7.97 lb/ft³ to class 110, or that runs all the way down to 500 at the light end, is describing the pre-2025 eleven-sub scale. If an older tool disagrees with this one in the mid-range, that is why.

Class bands are narrow in the middle and wide at the ends, which makes mid-density freight unusually sensitive to measurement. At 53.33 cu ft, one and a half pounds of extra weight lifts a 7.97 lb/ft³ pallet from class 125 to 100. At 9.4 lb/ft³ the same pallet needs roughly 32 lb more to reach the next band.

Two consequences. Weigh on a certified scale instead of estimating — carriers audit, and the reclass bill arrives weeks after delivery with a fee attached. And if you are close to a boundary, consider making the load smaller rather than lighter: cutting height reduces volume, which raises density without adding a gram.

Class is an input to the rate, not the rate itself. Carriers price an LTL shipment from class, weight, origin and destination lanes, and accessorials — liftgate, inside delivery, residential, appointment, limited access. A class-125 shipment can cost less than a class-100 one if the latter goes to a remote ZIP code and needs a liftgate at both ends.

What class does control is the rate per hundredweight. Most LTL tariffs publish rates per 100 lb by class, and the spread is steep: class 500 can price at several times the class-100 rate on the same lane. That is why measurement work pays for itself on any lane you ship repeatedly.

Density decides the class for general freight, but the NMFC has always classified on four transportation characteristics, and the other three can override density. Stowability covers freight that cannot be stacked or loaded alongside other shipments, so it occupies space its weight does not pay for. Handling covers anything needing special equipment or care to load and unload. Liability covers high-value, fragile, hazardous, or theft-prone freight.

An item flagged for any of these carries a class above what its density suggests. The NMFC item number is what tells a carrier which rule applies in the first place.

Docket 2025-1 was the largest reclassification in the NMFC's history. More than 2,000 items moved from commodity-based listings to full density-based classification, generic headings were consolidated, the density scale expanded from eleven sub-provisions to thirteen, and NMFTA launched ClassIT+ as the digital home for NMFC data.

The practical effect: a class that was correct in early 2025 may not be correct now, even though the product, packaging, and weight never changed. The process is also rolling rather than one-off — two dockets a year — so the class on last year's invoice is not evidence of the class you should book today.

Every number this calculator wants is a property of the handling unit, not of the product. Three things get left out. A standard 48 × 40 in wood pallet weighs 30 to 70 lb and stands about 5 to 6 in tall, and both the weight and the height are billable. Overhang counts: if cartons extend past the pallet edge, the carrier measures the widest point. And do-not-stack pyramids are sometimes counted in the height and sometimes not, which is an argument worth avoiding with stickers rather than hardware.

Round up. Measure to the nearest inch, upward — carriers re-measure, and under-declaring dimensions is the shortest route to a reclass fee.