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Dimensional Weight Calculator

Calculate the volumetric weight to determine your package's billable weight.

Standard: 139 for Domestic US.

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Understanding Dimensional Weight

When shipping packages via major couriers like FedEx, UPS, or DHL, you aren't just charged by how heavy your box is. If you ship a very lightweight item in a massive box, it takes up valuable space on their planes and trucks. To account for this, couriers use Dimensional (DIM) Weight.

Your "Billable Weight" is always the greater of the Actual Weight or the Dimensional Weight.

How it is Calculated

Multiply Length × Width × Height to get the volume, then divide by the correct DIM Divisor. For US domestic shipments in inches, FedEx and UPS typically use 139. For international metric shipments in cm, 5000 is often used.

Stop Paying for Air

If your dimensional weight exceeds your actual weight, you are essentially paying to ship empty space. Using correctly sized packaging is the single best way to lower your shipping rates.

Frequently Asked Questions

Dimensional weight is a pricing technique used by commercial freight transport companies (like FedEx, UPS, and DHL). It reflects package density, which is the amount of space a package occupies in relation to its actual weight.
For US domestic shipments and international shipments measured in inches, FedEx generally uses a divisor of 139. If you are calculating in centimeters and kilograms, the common divisor is 5000. However, high-volume shippers may negotiate lower customized divisors.
The best way to reduce or avoid high DIM weight charges is to pack your items in the smallest possible box. Minimize void fill (like bubble wrap and peanuts) where safe to do so, and consider shipping multiple small items separately rather than in one giant box.
No, the billable weight relies on whichever value is higher between the actual weight of the package and its calculated dimensional weight.
If you use standard "FedEx One Rate" packaging, standard dimensional rates often do not apply as long as it fits and is under a generous weight limit (typically 50 lbs). However, using your own boxes will subject it to DIM weight rules.
Yes, USPS has implemented DIM pricing for Priority Mail, Priority Mail Express, and Parcel Select for packages exceeding 1 cubic foot (1728 cubic inches). They use a divisor of 166.
Yes, FedEx rules state you must round to the nearest whole inch or centimeter. If the fraction is .5 or greater, round up to the next whole number. For .49 or less, round down.

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