Understanding Freight Class for Amazon Partnered Carrier LTL Shipments
Explains how to determine the correct freight class for LTL shipments through Amazon's Partnered Carrier program, covering density calculations, class ranges, and cost implications for FBA sellers.
Overview
When shipping inventory to Amazon fulfillment centers via less-than-truckload (LTL) carriers through Amazon's Partnered Carrier program, sellers must assign the correct freight class to their shipments. Freight class determines shipping costs and handling requirements, making it one of the most important decisions in the inbound shipping workflow. Choosing the wrong freight class can lead to reclassification fees, delivery delays, or unexpected cost increases.
Key Points / What Sellers Need to Know
- Freight class is density-based — Amazon's partnered carrier program uses the National Motor Freight Classification (NMFC) system, where freight class is primarily determined by the density of your shipment (weight relative to volume).
- Density calculation matters — To estimate your freight class, divide the total shipment weight (in pounds) by the total cubic feet of space it occupies. Higher density generally means a lower freight class and lower shipping cost.
- Classes range from 50 to 500 — Freight classes span from class 50 (heaviest, most dense freight) to class 500 (lightest, least dense freight). Most Amazon FBA shipments fall between class 77.5 and class 200.
- Incorrect classification triggers adjustments — If the carrier determines that your shipment's actual freight class differs from what you declared, they may reclassify it and charge you the higher rate, sometimes with additional fees.
- Pallet dimensions and weight are inputs — You need accurate measurements of each pallet's length, width, height, and weight to calculate density and select the appropriate freight class.
How Freight Class Is Determined
Freight class under the NMFC system considers four primary factors: density, stowability, handling difficulty, and liability. For most standard Amazon FBA shipments consisting of boxed consumer products on pallets, density is the dominant factor. To calculate density, measure each pallet's dimensions in inches, convert to cubic feet (length × width × height ÷ 1,728), and then divide the pallet weight in pounds by the cubic footage. The resulting pounds-per-cubic-foot figure maps to a specific freight class. For example, shipments with a density of 35 pounds per cubic foot or higher typically qualify for class 65, while shipments at 6 to 8 pounds per cubic foot fall into class 125.
Analysis & Recommendations
Why This Matters
Freight class directly determines LTL shipping costs for FBA sellers using Amazon's partnered carriers. Incorrect classification leads to reclassification fees and unexpected charges that reduce profit margins.
Key Takeaways
- Freight class is primarily determined by shipment density — weight divided by cubic volume
- Most FBA shipments fall between freight class 77.5 and 200, with denser shipments getting lower, cheaper classes
- Carriers can reclassify and charge more if your declared freight class is inaccurate
- Compact, dense pallets with minimal empty space result in lower freight classes and shipping savings
Recommended Actions
- →Weigh and measure every pallet accurately before creating LTL shipments in Seller Central
- →Calculate density (lbs per cubic foot) to select the correct freight class rather than guessing
- →Minimize empty space on pallets to increase density and reduce your freight class
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