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For every size and shape of mail or package, there is a minimum and maximum size. See the charts below to ensure your mail meets the United States Postal Service measurement standards and limits.
Standard Shape and Size Guidelines
Letters:
• Maximum thickness is 1/4”
• Minimum size is 5” long X 3 1/2” high
• Maximum size is 11 1/2" long X 6 1/8" high
Postcard:
• Maximum size is 6” long X 4 1/4” high
• Minimum size is 5” long X 3 1/2” high
Large Envelopes:
• Maximum thickness is 3/4”
• Minimum size is 11 1/2" long X 6 1/8" high
• Maximum size is 15" long X 12" high
Parcel Post package:
• Maximum size is length + width around largest point = 130”
Other package services:
• Maximum size is length + width around largest point = 108”
Unusual Shapes and Sizes Guidelines
Once a piece of mail exceeds the maximum length, height or thickness of one shape, it automatically gets classified as the next largest shape. In addition, a piece of mail requires more postage when it is a certain shape or size that is difficult to process on mail sorting machines.
The examples below could require additional postage:
• Square envelopes.
• Packages larger than 34 inches long, 17 inches wide or 17 inches high.
• Envelopes on which the address is written parallel to the shorter edge.
• Packages weighing more than 35 pounds.
• Books or printed material weighing more than 25 pounds.
• Tubes and rolls.
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