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New Mailing     Manage Mailings
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View Dimensions

Domestic Dimensions

Postcards

Valid Postcard Dimensions
Property Minimum Maximum
Length 5 inches 9 inches
Height 3-1/2 inches 6 inches
Thickness 0.007 inch 0.016 inch

Letter

Valid Letter Dimensions
Property Minimum Maximum
Length 5 inches 11-1/2 inches
Height 3-1/2 inches 6-1/8 inches
Thickness 0.007 inch 1/4 inch

Flats

Valid Large Envelope Dimensions
Property Minimum Maximum
Length 11-1/2 inches 15 inches
Height 6-1/8 inches 12 inches
Thickness 1/4 inch 3/4 inch

Parcel

Valid Package Dimensions

Length: the longest side of the parcel
Girth: measurement around the thickest part (perpendicular to the length)
Length plus girth combined cannot exceed 108 inches. (USPS Retail Ground cannot exceed 130 inches.)

International Dimensions

Postcards

Valid Postcard Dimensions
Property Minimum Maximum
Length 5-1/2 inches 6 inches
Height 3-1/2 inches 4-1/4 inches
Thickness 0.007 inch 0.016 inch

Letter

Valid Letter Dimensions
Property Minimum Maximum
Length 5-1/2 inches 11-1/2 inches
Height 3-1/2 inches 6-1/8 inches
Thickness 0.007 inch 1/4 inch

Large Envelope

Valid Large Envelope Dimensions
Property Minimum Maximum
Length 11-1/2 inches 15 inches
Height 6-1/8 inches 12 inches
Thickness 1/4 inch 3/4 inch

Package

Valid Package Dimensions

International Packages except First-Class Package International Service
Length is the longest side of the parcel.
Girth is the measurement around the thickest part of the parcel.
Length plus girth cannot exceed 108 inches.

First-Class Package International Service
Size—Other than Rolls
Maximum length = 24 inches
Maximum length + height + thickness combined = 36 inches

Size—Rolls
Minimum length = 4 inches
Minimum length + twice the diameter combined = 6-3/4 inches
Maximum length + twice the diameter combined = 42 inches

M-Bag

There are no defined size limits so long as articles being sent can be enclosed in the mailbag.

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