Dim divisor
The number a carrier divides cubic inches by to get dimensional weight in pounds.
In practice
A smaller divisor makes the same box bill heavier. USPS moved to 139 for rectangular Priority Mail and Parcel Select parcels from 2026-07-12, per its Domestic Mail Manual.
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Related terms
- Dimensional weight
- A billing weight that carriers compute from package size: length × width × height divided by a divisor.
- Billable weight
- The weight a carrier actually charges for: the greater of the rounded actual weight and the dimensional weight.
Definitions written by Packgent, last reviewed 2026-10-27. All terms.