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Freight Class & Density Calculator

LTL Shipping

LTL Density & Freight Class Calculator

Determine the density of your shipment and estimate its standard NMFC freight class to avoid carrier reclassification fees.

About Freight Class & Density (LTL)

In North America, Less-Than-Truckload (LTL) shipments are classified using the National Motor Freight Classification (NMFC) system. This system groups commodities into 18 classes (ranging from 50 to 500) to standardize freight pricing. The class is primarily determined by cargo density (measured in pounds per cubic foot or PCF), alongside handleability, stowability, and liability.

How Density Determines Your Freight Class

A higher density shipment occupies less space relative to its weight (e.g., steel rods, tiles). This makes it cheaper to transport per pound, leading to a lower class (like Class 50). Conversely, low-density cargo takes up a lot of space but is very light (e.g., ping pong balls, foam packaging), resulting in a high class (like Class 400 or 500) which has a higher shipping rate per pound.

NMFC Standard Density-to-Class Table

Carriers use the following density ranges to categorize freight. If your cargo does not have a specific commodity-based NMFC code, it is generally classified based on these density tiers:

Minimum Density (lbs/cu ft) Estimated NMFC Class Common Commodities
50 or greater50Steel, gravel, heavy machinery
35 to 5055Hardwood, bricks, cement bags
30 to 3560Ceramic tile, car parts
22.5 to 3065Bottled drinks, books
15 to 22.570Engines, car accessories, boxes
13.5 to 1577.5Shoes, apparel, hand tools
12 to 13.585Canned foods, leather cases
10.5 to 1292.5Computers, monitors, hardware
9 to 10.5100Vacuum cleaners, boat covers
8 to 9110Office chairs, cabinets
7 to 8125Cushions, small appliances
6 to 7150Suitcases, plastic hoses
5 to 6175Clothing racks, exhaust pipes
4 to 5200Boxed furniture, mattresses
3 to 4250Ladders, lighting fixtures
2 to 3300Model airplanes, kayaks
1 to 2400Deer antlers, foam packaging
Less than 1500Ping pong balls, gold dust

Why Getting the Class Right Matters

If you declare the wrong freight class on your Bill of Lading (BOL), the carrier will audit the shipment at the terminal using automated dimensioning machines. If they find the density does not match your declared class, they will reclassify the shipment and hit you with a **reclassification fee** (typically $50–$150) plus the rate difference. Using this calculator helps you avoid these unexpected chargebacks.