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USPS Priority Mail Dimensional Weight Calculator

Estimate chargeable pounds for rectangular domestic retail Priority Mail parcels under the July 2026 rules.

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Good to know: Current-rule worksheet from July 12, 2026, reviewed November 11, 2026: domestic retail Priority Mail, zones 1–9, rectangular non-Flat-Rate/non-Cubic parcels only. Each outer dimension rounds UP to a whole inch. Above 1,728 cubic inches, divide by 139 and round up to whole pounds; compare with rounded actual weight, capped at the 70-pound price for DIM. Actual weight must not exceed 70 lb. Conservatively checks rounded length plus girth against 108 inches. Not postage pricing, service eligibility, surcharge calculation, or a rule for every courier. Older pages may still show 166; this version follows current DMM 123.1.3.2.

How to use it (step by step)

  1. 1Confirm this is a rectangular domestic retail Priority Mail parcel, not Flat Rate or Cubic.
  2. 2Enter the packed outer length, width and height in inches and total packed weight in pounds. Use at most two decimal places.
  3. 3Compare chargeable pounds with the official USPS postage calculator. Destination, surcharges and packaging can change the final price.

Words to know

DIM weight
A pricing weight based on how much space a large light parcel occupies. It is not its scale weight.
Girth
Twice width plus twice height; the longest side is the length.

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Sources & methods

References checked November 11, 2026. Read each tool’s scope and assumptions before relying on its result.

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