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Measuring Tips | |
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Let us show you how your mail measures up. |
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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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