A-Envelope Size Guide

Dealing with envelopes can get complicated, especially if they are not something you deal with on a regular basis.  There are a few VERY common envelopes such as a #10 (the standard business letterhead envelope) and a #9 (the standard reply envelope that comes with all of your bills) and then there are tons of other "standard" sizes such as A2, A7, 4-Bar, #6 3/4 and so on.

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This blog is going to focus on the "A" sizes of envelopes.  A-envelopes are typically used for more formal communications such as invitations.  They are made from thicker paper stock and usually come in a wider variety of colors and finished than some of the other envelope sizes.  Most A-envelopes also have side seams (the back of the envelope is put together with two vertical glue seams as opposed to three triangular flaps) which give a more finished look to the envelope.

A-Envelope Sizes (inches):
  • A1 Envelopes - 3 5/8 x 5 1/8
  • A2 Envelopes - 4 3/8 x 5 3/4
  • A6 Envelopes - 4 3/4 x 6 1/2
  • A7 Envelopes - 5 1/4 x 7 1/4
  • A8 Envelopes - 5 1/2 x 8 1/8
  • A9 Envelopes - 5 3/4 x 8 3/4
  • A10 Envelopes - 6 x 9 1/2
A-Envelope Insert Sizes (inches):
  • A1 Envelopes fits 3 1/2 x 4 7/8 inserts
  • A2 Envelopes fits 4 1/4 x 5 1/2 inserts
  • A6 Envelopes fits 4 1/2 x 6 1/4 inserts
  • A7 Envelopes fits 5 1/8 x 7 inserts
  • A8 Envelopes fits 5 3/8 x 7 7/8 inserts
  • A9 Envelopes fits 5 1/2 x 8 1/2 inserts
  • A10 Envelopes fits 5 3/4 x 9 1/4 inserts