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FedEx Dimensional Weight (DIM)

By Last updated on: February 26, 2024

Dimensional (DIM) weight pricing is the carriers’ way of encouraging parcel shippers to optimize box sizes. This discourages wasted space inside the boxes, which destroys room in their trucks. The package’s DIM weight replaces the billable weight if it’s higher than the physical weight. Standard FedEx DIM weight calculation, the DIM weight divisor is 139 for ground and express domestic shipping and international shipments.

Estimated reading time: 3 minutes

What is Dimensional Weight?

All shippers must now think about FedEx’s dimensional weight. Ultimately, this negatively affects e-commerce business owners that ship large, lightweight packages. Because the package’s DIM weight will be high, and its actual weight will be low.

Dimensional weight = Package Volume / DIM weight factor

FedEx Dimensional weight = ( L x W x H ) / 139

DIM Weight Calculations
DIM Weight Dimensional FedEx UPS Refund Retriever Calculations

To calculate dim weight:

  1. Multiply length by width by height in inches. Round each measurement to the nearest whole inch. The resulting total is the cubic size of your package. For example, 1 to 1.49 will be considered 1, and 1.5 to 1.99 will be considered 2.
  2. Dividing by 139 for U.S., Puerto Rico, and international shipments.
FedEx Dimensional Weight DIM 2021

DIM Weight Refund

FedEx and UPS calculate the dimensional weight of all packages. Package charges will be for the higher amount of DIM or actual weight. Thus, FedEx DIM weight will cause you to pay for shipping weight that is not even present.

Today’s hall-of-fame post is a dimensional-weight error on a package from New York City. A customer recently sent a heavy package Priority Overnight. The box weighs just over 100 pounds but was billed with a rated weight of over 270 pounds. Based on the dimensions, our calculations find it should have been rated at around 100 pounds instead.

The result of our efforts? The package charge is over $900, but re-rate the application to about $100. Our customer gets a check for an $800+ refund, thanks to our FedEx express auditing service watching for dim-weight mistakes.

example refund check

Shipping Reports to help your company

Refund Retriever provides a full suite of shipping reports to help your business cut shipping costs. Reports include mistakes made by FedEx and UPS or your shipping manager. We will provide information with all your FedEx DIM weight packages at no charge. Therefore, sign up with Refund Retriever and start saving money today.

FedEx Dim Weight Report

FedEx Smart Post (FedEx Ground Economy) Dim Weight

FedEx Smart Post Dim Weight
Brian Gibbs

Author Brian Gibbs

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Brian Gibbs | President of Refund Retriever

Brian Gibbs founded Refund Retriever in 2006 while running his first eBay-based business and seeing the shortcomings of other shipment auditing companies. Refund Retriever's primary focus is FedEx and UPS parcel invoice auditing. After graduating from Texas A&M University in 2001, he graduated from the University of Houston in 2004 with a JD and MBA. Gibbs has been featured in Forbes, Entrepreneur, and other publications discussing parcel auditing, shipping, e-commerce, and more. Learn more at or call (800) 441-8085 for more information.

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