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Freight Class Estimator

LTL · Density · Freight education

Freight Class Information

Understand how a freight class calculator turns packed pallet dimensions and weight into a density-based estimate. Use the freight class calculator for the calculation, then verify the final class with your carrier or broker.

How freight density is calculated

Freight density is the shipment weight divided by its total volume. Measure the freight as it will ship, including the pallet, packaging, and protective materials. Use inches for every dimension and pounds for weight.

Volume (ft³) = length × width × height ÷ 1,728.
Density (lb/ft³) = weight (lb) ÷ volume (ft³).

Worked freight class example

A pallet measuring 48 × 40 × 48 inches and weighing 350 lb has a volume of about 53.333 ft³. Divide 350 lb by 53.333 ft³ to get approximately6.5625 lb/ft³. That density falls in the 6 to less than 8 range, producing an estimatedfreight class 125 on the July 2025 scale.

Freight class density ranges

These are the inclusive-lower and exclusive-upper ranges used by this educational estimator. A higher density generally maps to a lower class number, but density is not the only classification factor.

Density to freight class table

Freight classDensity (lb/ft³)
50≥50 lb/ft³
5535–<50 lb/ft³
6030–<35 lb/ft³
6522.5–<30 lb/ft³
7015–<22.5 lb/ft³
8512–<15 lb/ft³
92.510–<12 lb/ft³
1008–<10 lb/ft³
1256–<8 lb/ft³
1754–<6 lb/ft³
2502–<4 lb/ft³
3001–<2 lb/ft³
400<1 lb/ft³

How to measure freight for an LTL shipment

  1. Measure the longest packed length, width, and height in inches.
  2. Weigh the complete shipping unit, including pallet and packaging.
  3. Enter each pallet into the calculator and review the density and estimated class.
  4. Keep the dimensions, weight, commodity description, and packaging notes for the carrier or broker.

For multiple pallets, this calculator adds all volumes and all weights before calculating one blended density. If the pallets contain different commodities or have very different densities, ask whether they should be submitted as separate freight lines instead.

Why freight class matters for LTL planning

Freight class is one input a carrier may use when rating an LTL shipment. An incorrect class or inaccurate dimensions can lead to a reclassification, a changed invoice, or a request for more shipment details. Keep a record of the packed dimensions, scale weight, commodity description, and pallet count so your quote and bill of lading use consistent information.

How packaging can affect density

Density can increase when you safely reduce empty space, choose an appropriately sized carton, consolidate compatible packages, or ship furniture and equipment in a more compact configuration. Never remove protection that is needed for safe handling, and do not change the declared class simply to obtain a lower quote. A carrier can apply handling, stowability, liability, or commodity rules in addition to density.

Freight class and DIM weight are different

Freight class is an LTL classification estimate based mainly on density and shipment characteristics. DIM weight is a separate pricing concept that multiplies volume by a carrier-specific factor. DIM weight is common in parcel and air pricing and may also appear in some freight quotes, but it does not determine the density class calculated here.

What can change the final freight class?

Density is a useful starting point, but official classification can also depend on the specific NMFC item, packaging, stowability, handling characteristics, and liability. A carrier may review the shipment differently from this educational estimate. This site is not NMFTA ClassIT+, a binding classification service, or a shipping quote.

About Freight Class Estimator

Freight Class Estimator is a free, private educational tool for LTL planning. It performs calculations in your browser, does not rate carriers, and is not affiliated with NMFTA or any carrier network. Read the freight class FAQor contact us with questions.