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Package Sizes and Dimensions: USPS Domestic

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The following table lays out the maximum weights and dimensions for domestic package and envelope types offered through the USPS. When determining your package size, you may need to know the packages' girth. The girth of a package is equal to (2 x width) + (2 x height). Learn more about shipment dimensions.

Oversized Priority Mail packages may be subject to dimensional pricing even when below the maximum 108" dimension. Learn more about USPS oversized package charges.

Packages are also subject to minimum dimensions. No package may be smaller than 5" x 3.5" x 0.007". Machinable packages may not be smaller than 6" x 3" x 0.25". Non-machinable packages may be subject to additional handling fees. Learn more about physical standards for parcels.

Some domestic shipping supplies are offered for free through the USPS. Learn how to order free supplies.

DOMESTIC PACKAGE SIZE CHART

Package Type 

Service

Max Weight

Max Dimensions

Package First Class Package Service 15.9 oz 22" x 18" x 15"
Parcel Select Ground 70 lbs Length + Girth < 130"
Priority Mail 70 lbs Length + Girth < 108"
Priority Mail Express 70 lbs Length + Girth < 108"
Flat Rate Small Box Priority Mail 70 lbs  8-5/8" x 5-3/8" x 1-5/8"  
Flat Rate Medium Box Priority Mail 70 lbs  13-5/8" x 11-7/8" x 3-3/8"  
Flat Rate Large Box Priority Mail 70 lbs  12" x 12" x 5-1/2" 
Regional Rate Box A Priority Mail 15 lbs 10-15/16" x 2-3/8" x 12-13/16"
10" x 7" x 4-3/4"
Regional Rate Box B Priority Mail 20 lbs 14-3/8" x 2-7/8" x 15-7/8"
12" x 10-1/4" x 5"

DOMESTIC ENVELOPE SIZE CHART

Envelope Type

Service

Max Weight

Max Dimensions

Letter First Class Mail 3.5 oz 11-1/2" x 1/4" x 6-1/8"
Flat Rate Envelope Priority Mail
Priority Mail Express
70 lbs 12-1/2" x 9-1/2"
Flat Rate Padded Envelope Priority Mail
Priority Mail Express
70 lbs 13" x 10"
Flat Rate Legal Envelope Priority Mail
Priority Mail Express
70 lbs 15" x 9-1/2"

  


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