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Sizes

International standard sizes

 

International standard ISO 269 defines several standard envelope sizes, which are designed for use with ISO 216 standard paper sizes:

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​The German standard DIN 678 defines a similar list of envelope formats.

North American sizes

There are dozens of sizes of envelopes available.The designations such as "A2" do not correspond to ISO paper sizes. (Often, North American paper jobbers and printers will insert a hyphen to distinguish from ISO sizes, thus: A-2.)

Envelopes accepted by the U.S. Postal Service to be eligible for mailing at the price for letters must be:

  • Rectangular

  • At least 3-1/2 inches high x 5 inches long x 0.007 inch thick.

  • No more than 6-1/8 inches high x 11-1/2 inches long x 1/4 inch thick

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