USPS aligns dimensional pricing July 12

The U.S. Postal Service said on May 11 that it will change how it measures and prices certain packages beginning July 12. The changes apply to Priority Mail Express, Priority Mail, USPS Ground Advantage and Parcel Select pieces that are subject to dimensional-weight pricing. USPS said the revisions are part of its July 2026 competitive package pricing filing with the Postal Regulatory Commission. (about.usps.com) ### Which packages are affected on July 12? USPS said the rule change applies to competitive package products including Priority Mail Express, Priority Mail, USPS Ground Advantage and Parcel Select. (federalregister.gov) Supply Chain Dive reported the dimensional-pricing changes affect packages larger than 1 cubic foot, which are the parcels generally subject to dimensional-weight pricing under USPS rules. The Postal Service also said July 12 is the date for a broader parcel-dimension compliance change requiring commercial mailers to include accurate parcel dimensions in manifests for those same product lines, excluding Flat Rate pieces and USPS Returns. (about.usps.com) USPS said enforcement of broader noncompliance fees will be deferred until a second phase tentatively scheduled for early 2027, though existing fees remain for certain parcels over 1 cubic foot or 22 inches in length when dimensions are omitted or inaccurate. ### How will USPS measure a box differently? USPS said it will begin rounding up any fractional package measurement to the next whole inch. (about.usps.com) Supply Chain Dive cited the agency’s example that a package measuring 12.2 inches will be treated as 13 inches for calculation purposes. That matters because dimensional weight starts with package volume: length multiplied by width by height. When each side is rounded up before the calculation, the billed size can increase even if the physical box did not change. FedEx and UPS already use similar rounding practices, according to Supply Chain Dive. (about.usps.com) ### What is changing in dimensional-weight pricing itself? USPS said it will “align the divisor for dimensional weight pieces to industry standards” for the affected services. The Postal Service said the new divisor will be 139, replacing 166. (supplychaindive.com) Supply Chain Dive said a lower divisor increases dimensional weight for large, lightweight parcels because the package volume is divided by a smaller number. The publication said that means dimensional-weight billing will apply to more bulky shipments regardless of their actual scale weight. (supplychaindive.com) ### Why did USPS say it is making the change? USPS said the adjustments will let it “continue providing reliable, nationwide service while managing the capacity of our ground and air networks efficiently.” The agency also said that aligning its calculation methods with those used across the shipping industry will provide “a more consistent experience for businesses and consumers alike.” (about.usps.com) In its May 11 release, the Postal Service said the July package-price filing is part of its broader shipping-products strategy and remains subject to Postal Regulatory Commission review. USPS directed customers to the PRC docket for the full filing materials. (supplychaindive.com) ### What should shippers and software teams check before July 12? July 12 is the date when rating engines, shipping APIs and billing workflows will need to reflect both whole-inch rounding and the 139 divisor for affected USPS parcel services. If those systems continue using fractional dimensions or the old divisor, quoted prices and invoiced prices can diverge once the rule takes effect. (supplychaindive.com) That is an inference based on the published USPS calculation changes and the simultaneous expansion of manifest-dimension requirements. The Postal Regulatory Commission comment window in the Federal Register notice ran through May 14, 2026, and USPS said the proposed competitive package changes are scheduled to take effect July 12 pending favorable review. (about.usps.com) The filing is listed with the PRC under Docket No. CP2026-8, according to the Postal Service. (federalregister.gov) (about.usps.com)