Shippers say “what's my NMFC?” and mean two different things: the item number that identifies the commodity, and the freight class that prices it. The item produces the class. Understanding that one sentence prevents most classification arguments with carriers.

How the classification is organized

The National Motor Freight Classification, maintained by the NMFTA, groups every commodity that moves LTL into numbered items. Each item carries provisions that assign a class — and since the July 2025 overhaul (Docket 2025-1), those provisions come in two main flavors:

  • Density-rated items. Commodities with no unusual handling, stowability or liability characteristics point at the standard 13-tier density scale. Your measured lb/ft³ picks the sub-provision, and the sub picks the class — sub 1 (under 1 pcf, class 400) through sub 13 (50+ pcf, class 50).
  • Commodity-rated items. Freight that's fragile, hazardous, high-value, awkward to stow, or governed by packaging rules keeps a commodity-specific class or its own conditions. Density doesn't override these.

Reading an item like a rater does

When a carrier inspector looks at your BOL, the sequence is: find the item that best describes the commodity as packaged; apply its provisions (packaging requirements, released-value rules, density subs); assign the class; re-rate the invoice if the BOL disagreed. The most common corrections are shippers using a stale class after a packaging change, and shippers guessing a “nice” class like 70 because it looked normal on last year's quotes.

Estimate the density-based class before you look up the item Open the freight class calculator →

How to actually look up your commodity

  1. ClassIT — NMFTA's official lookup (classit.nmfta.org, subscription). Search by commodity keywords, read the item + subs. This is the source of truth.
  2. Your carrier or 3PL — every LTL carrier's classification desk will confirm an item number, and most sales reps will do it to win the freight. Attach photos and dims when you ask.
  3. Density first, as a sanity check — measure, cube and divide (our step-by-step guide), then check whether the commodity plausibly has special provisions. General merchandise, parts, packaged goods: density usually governs. Batteries, mattresses, artwork, machinery with attachments: expect commodity rules.

What to put on the bill of lading

The BOL line that sails through inspection has four things: a real commodity description (“steel brackets, boxed, palletized” — not “freight”), the NMFC item and sub, the measured dims and weight of each handling unit, and the class those numbers produce. Carriers photograph and dimension nearly everything now; the shippers who never see reclass fees are simply the ones whose paperwork already matches the machine's measurement.

Disclaimer that matters: the NMFC is a licensed publication and changes through NMFTA dockets multiple times a year. Treat any free chart — including ours — as an estimate; the current NMFC text and your carrier's tariff govern.

Quick answers

What is an NMFC code?
An NMFC item number is the National Motor Freight Classification's identifier for a commodity (or commodity group). The item carries the rules that assign your freight class — for most general freight now a density lookup, for special commodities a fixed or condition-based class.
Where do I find my NMFC code?
NMFTA's ClassIT tool (subscription) is the authoritative lookup; your carrier or 3PL can also confirm an item number for you — most will, because misclassified freight costs them time too.
Is the NMFC code the same as the freight class?
No. The item number identifies the commodity; the class (50–400) is the rating the item's rules produce. One item can yield different classes at different densities via its sub-provisions.
Do I need an NMFC code on my BOL?
It's strongly recommended and many carriers require it. A BOL with item number + sub, actual dims and weight is the paperwork least likely to be inspected, reweighed or reclassed.

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