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envelope types

Envelope Sizes

We often get questions from clients about what size different envelope types are or what are the names or numbers of different envelopes.  For instance many clients ask, “What are the dimensions of a #10 envelope?”  Dimensions and naming is often confusing but below is an envelope size chart with the type, dimensions, name, and use of the four most common envelope sizes.


Type Dimensions (inches) Name or Number Use
Regular 4 1/8 x 9 1/2 #10 This is typically used for letter mailings where the letter is tri-folded. These included statements, or correspondence
Reply 3 7/8 x 8 7/8 #9 These envelopes are inserted inside a #10 envelope and are used for respondents to send a reply to the mailing
Announcement 6 x 9 1/2 A-10 These are typically used for invitation mailings or mailings that have a 8.5 x 5.5 half sheet of paper insert
9x12 9 x 12 9 by 12 (#10- 1/2 for catalog #9 booklet) These are used when unfolded 8.5x11 letter size sheets are to be inserted without any folding


These are the most common size envelopes, but many other envelope sizes are available and we can even custom make envelopes for your specific mailing.  We can also add windows, security tints, and color variable data printing to your envelope.

Each envelope type will effect the production and handling of your mailing so be sure to contact us to help select the best envelope for the look and feel of you mailing as well as which envelope will save on production and postage costs. If you have questions about additional envelope sizes give us a call at 760 480 2323 or drop by our San Diego offices at 230 Market Place, Escondido, CA 92029.