You'll pay an extra fee for sending a nonstandard size: See if a nonstandard size fee applies.If you give inaccurate dimensions and/or don’t pay the DIM weight rate (when it applies), you’ll pay a dimension-noncompliance fee.If the DIM weight (Length x Width x Height ÷ 166) is greater than the actual package weight, you’ll need to pay the DIM weight price.

Dimensional (DIM) weight 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). For example, Commercial First-Class Package Service ® can only be used for packages under 15.999 oz when creating a label through a PC Postage vendor anything over the weight limit must be shipped with Priority Mail ® service. This applies to all mail classes-domestic and international. If you have a First-Class Package Service-Retail ® 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).

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