LTL Freight Class & Density Calculator

LTL (Less-Than-Truckload) freight class is a standardized classification system (ranging from Class 50 to Class 500) established by the NMFTA to determine shipping costs based on density, stowability, ease of handling, and liability.

PCF density (Pounds per Cubic Foot) is the primary factor. High-density cargo (e.g. steel, bricks) resolves to lower, cheaper classes (like Class 50 or 55). Low-density, bulky cargo (e.g. ping-pong balls, furniture) resolves to expensive classes (Class 400 or 500).

The four factors are: Density (weight relative to volume), Stowability (shape and stackability), Ease of Handling (danger or care required to load), and Liability (value and fragile susceptibility to damage).

PCF Density = Weight (lbs) / Volume (cubic feet). Volume is calculated by multiplying Length × Width × Height in inches and dividing by 1,728.

An NMFC code identifies specific commodities. Even if density is high, some items have high liability or handling issues (like hazardous chemicals), which overrides default density classes.

If a shipment occupies more than a set length of a truck (typically 12 to 14 linear feet), carriers charge based on a space surcharge rather than class weight rates to prevent truck volume hogging.

You must include the weight of the shipping pallet (typically 30 to 50 lbs) and shrinkwrap in total weight, and pallet outer dimensions in total volume computations.

Breakpoints include: Over 30 PCF (Class 50), 15 to 22.5 PCF (Class 70), 8 to 9 PCF (Class 110), 4 to 5 PCF (Class 250), and under 1 PCF (Class 500).

Yes, but you must convert kg/m³ to PCF. Multiply kg/m³ density by 0.0624 to find the equivalent PCF rating for NMFC lookup.

Carriers re-weigh and audit shipments using dimensioning scanners. Discrepancies result in expensive re-classification fees and rate adjustments invoiced to the shipper.

Cargo density (pounds per cubic foot, PCF) is the primary baseline factor, modified by stowability, handling ease, and liability/damage risk.

The National Motor Freight Traffic Association (NMFTA) defines 18 standardized freight classes ranging from Class 50 (cheapest) to Class 500 (most expensive).

Class 50 applies to extremely dense, durable freight weighing over 50 lbs/cu ft (e.g. steel, cast iron). Class 500 applies to low-density, fragile cargo weighing under 1 lb/cu ft.

Compute Total Package Volume in cubic feet = (Length × Width × Height) / 1,728 (for inches). Divide Total Weight (lbs) by Total Volume (cu ft).

When shipping freight on pallets, carrier density formulas measure total outer dimensions including the 4-inch pallet height and overhanging edges.

NMFC rules permit 'bumping' freight to a lower class tier by declaring a higher artificial billing weight if it results in lower total shipping cost.

Items susceptible to theft, spoilage, or hazardous material contamination are bumped to higher freight classes regardless of density.

If carrier dimensioners find actual density or weight differs from the bill of lading (BOL), the shipment is re-classed at higher spot rates plus inspection penalties.