Dimensional (DIM) weight 1 rates apply to domestic Priority Mail ®, Priority Mail Express ®, Parcel Select ®, and Parcel Select Lightweight ® packages larger than 1 cubic foot (1,728 cubic inches). Measure the length, width, and height of the package. Select the Right Mail Classįor example, First-Class Package Service-Commercial can only be used for packages under 15.999 oz anything over the weight limit must be shipped with Priority Mail ® service. This applies to all mail classes-domestic and international. If you have an item for shipping by First-Class Package Service ® that weighs 7.3 oz, it must be charged at the 8 oz-rate. For example, if your package weighs 3 lbs 5 oz, it would be charged at the 4 lb-rate. USPS rounds up to either the next pound (lb) or ounce (oz). How to Calculate Postage Correctly Weigh Your Item and Round Up
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