Envelope Sizing Guide

The following is a guide to envelope types, styles, and sizes. Below you will find the different styles of envelopes. These envelope sizes apply only to the United States. Standard International envelope sizes differ.

Commercial Envelopes

Also called business, standard, or official envelopes, these are open side envelopes usually with commercial style flaps and diagonal seams. However, some sizes come with side seams and square or pointed flaps. Most common uses include business, direct mail, personal correspondence and direct mail. The most popular size is the standard #10 envelope. Commercial envelopes can also come with a window or two on the front, which allow addresses to show through the face of the envelope. These are typically used for invoices or billing statements, paychecks and receipts.

 

  • #5
  • Envelope Size: 5.5 x 3.0625
  • Document Enclosure Size: 5.25 x 2.8125

  • #6
  • Envelope Size: 6 x 3.375
  • Document Enclosure Size: 5.75 x 3.125

  • #6 1/4
  • Envelope Size: 6 x 3.5
  • Window Size: 4.5 x 1.125
  • Position from left: .75
  • Position from bottom: .5
  • Document Enclosure Size: 5.75 x 3.25

  • #6 1/2
  • Envelope Size: 6.25 x 3.5625
  • Document Enclosure Size: 6 x 3.3125

  • #6 3/4
  • Envelope Size: 6.5 x 3.625
  • Window Size: 4.5 x 1.125
  • Position from left: .875
  • Position from bottom: .5
  • Document Enclosure Size: 6.25 x 3.5

  • #7
  • Envelope Size: 6.75 x 3.75
  • Window Size: 4.5 x 1.125
  • Position from left: .875
  • Position from bottom: .5
  • Document Enclosure Size: 6.5 x 3.5

  • #7 1/2
  • Envelope Size: 7.625 x 3.75
  • Document Enclosure Size: 7.375 x 3.5

  • #7 3/4
  • Envelope Size: 7.5 x 3.875
  • Window Size: 4.5 x 1.125
  • Position from left: .875
  • Position from bottom: .5
  • Document Enclosure Size: 7.25 x 3.75

  • Monarch (pointed flap)
  • Envelope Size: 7.5 x 3.875
  • Window Size: 4.5 x 1.125
  • Position from left: .875
  • Position from bottom: .5
  • Document Enclosure Size: 7.25 x 3.75

  • #8 5/8 (Check)
  • Envelope Size: 8.625 x 3.625
  • Window Size: 4 x 1
  • Position from left: 1
  • Position from bottom: .75
  • Document Enclosure Size: 8.375 x 3.5

  • #9
  • Envelope Size: 8.875 x 3.875
  • Window Size: 4.5 x 1.125
  • Position from left: .875
  • Position from bottom: .5
  • Document Enclosure Size: 8.625 x 3.75

  • #10
  • Envelope Size: 9.5 x 4.125
  • Window Size: 4.5 x 1.125
  • Position from left: .875
  • Position from bottom: .5
  • Document Enclosure Size: 9.25 x 3.875

  • #10 1/2
  • Envelope Size: 9.5 x 4.5
  • Document Enclosure Size: 9.25 x 4.25

  • #11
  • Envelope Size: 10.375 x 4.5
  • Window Size: 4.5 x 1.125
  • Position from left: .875
  • Position from bottom: .5
  • Document Enclosure Size: 10.125 x 4.25

  • #12
  • Envelope Size: 11 x 4.75
  • Window Size: 4.5 x 1.125
  • Position from left: .875
  • Position from bottom: .5
  • Document Enclosure Size: 10.75 x 4.5

  • #14
  • Envelope Size: 11.5 x 5
  • Window Size: 4.5 x 1.125
  • Position from left: .875
  • Position from bottom: .5
  • Document Enclosure Size: 11.25 x 4.75

  • #16
  • Envelope Size: 12 x 6
  • Document Enclosure Size: 11.75 x 5.75

 

Baronial Envelopes

Used for formal invitations, greeting cards, and some stationery, Baronial is an open side, almost square envelope with deep pointed flaps and diagonal seams. Send formal announcements or use Baronial envelopes with fancy social stationery.

  • 2 Bar
  • Envelope Size: 4.25 x 3.1875
  • Document Enclosure Size: 4 x 2.9375

  • 4 Bar
  • Envelope Size: 5.125 x 3.625
  • Document Enclosure Size: 4.875 x 3.375

  • 5 Bar
  • Envelope Size: 5.625 x 4.125
  • Document Enclosure Size: 5.375 x 3.875

  • 5 1/4 Bar
  • Envelope Size: 5.25 x 4.25
  • Document Enclosure Size: 5 x 4

  • 5 1/2 Bar
  • Envelope Size: 5.625 x 4.375
  • Document Enclosure Size: 5.375 x 4.125

  • 6 Bar
  • Envelope Size: 6.5 x 4.75
  • Document Enclosure Size: 6.25 x 4.625

  • Gladstone
  • Envelope Size: 5.5625 x 3.5625
  • Document Enclosure Size: 5.375 x 3.375

  • Astor
  • Envelope Size: 5.625 x 3.625
  • Document Enclosure Size: 5.375 x 3.5

  • Belmont
  • Envelope Size: 6.25 x 4.25
  • Document Enclosure Size: 6 x 4

  • Lee
  • Envelope Size: 7.25 x 5.25
  • Document Enclosure Size: 7 x 5.125

 

Square Envelopes

Square envelopes are very distinctive due to their large square flaps and side seams, but the nonstandard size and shape can increase postage costs. Square envelopes are used primarily with announcements, advertising, and specialty greeting cards or other mailings where the sender wants to draw attention to the contents.

 

  • 5
  • Envelope Size: 5 x 5
  • Document Enclosure Size: 4.75 x 4.75

  • 5 1/2
  • Envelope Size: 5.5 x 5.5
  • Document Enclosure Size: 5.25 x 5.25

  • 6
  • Envelope Size: 6 x 6
  • Document Enclosure Size: 5.75 x 5.75

  • 6 1/2
  • Envelope Size: 6.5 x 6.5
  • Document Enclosure Size: 6.25 x 6.25

  • 7
  • Envelope Size: 7 x 7
  • Document Enclosure Size: 6.75 x 6.75

  • 7 1/2
  • Envelope Size: 7.5 x 7.5
  • Document Enclosure Size: 7.25 x 7.25

  • 8
  • Envelope Size: 8 x 8
  • Document Enclosure Size: 7.75 x 7.75

  • 8 1/2
  • Envelope Size: 8.5 x 8.5
  • Document Enclosure Size: 8.25 x 8.25

  • 9
  • Envelope Size: 9 x 9
  • Document Enclosure Size: 8.75 x 8.75

  • 9 1/2
  • Envelope Size: 9.5 x 9.5
  • Document Enclosure Size: 9.25 x 9.25

  • 10
  • Envelope Size: 10 x 10
  • Document Enclosure Size: 9.75 x 9.75

  • 13 1/2
  • Envelope Size: 13.5 x 13.5
  • Document Enclosure Size: 13.25 x 13.25

 

Announcement Envelopes

Typical uses of the Announcement envelope are for greeting cards, announcements, informal invitations, and small booklets. They are open side envelopes with square, often deep flaps and side seams. They are also often called A-Style or A-Line Envelopes.

 

  • A-1
  • Envelope Size: 5.125 x 3.625
  • Document Enclosure Size: 4.75 x 3.5

  • A-2
  • Envelope Size: 5.75 x 4.375
  • Document Enclosure Size: 5.5 x 4.125

  • A-6
  • Envelope Size: 6.5 x 4.75
  • Document Enclosure Size: 6.25 x 4.5

  • A-7
  • Envelope Size: 7.25 x 5.25
  • Document Enclosure Size: 7 x 5

  • A-8
  • Envelope Size: 8.125 x 5.5
  • Document Enclosure Size: 7.875 x 5.25

  • Slimline A-10
  • Envelope Size: 8.875 x 3.875
  • Document Enclosure Size: 8.625 x 3.625

  • A-10
  • Envelope Size: 9.5 x 6
  • Document Enclosure Size: 9.25 x 5.75

 

Booklet Envelopes

Open side envelopes with small square or wallet flaps and side seams, booklet envelopes are ideal for overall printing and mailing. Booklet envelopes are used not only for booklets but for brochures, catalogs, annual reports and other multi-page mailings.

 

  • #3
  • Envelope Size: 6.5 x 4.75
  • Document Enclosure Size: 6.25 x 4.5

  • #4 1/4
  • Envelope Size: 7.5 x 5
  • Document Enclosure Size: 7.25 x 4.75

  • #4 1/ 2
  • Envelope Size: 7.5 x 5.5
  • Document Enclosure Size: 7.25 x 5.5

  • #5
  • Envelope Size: 8.5 x 5.5
  • Document Enclosure Size: 8.25 x 5.25

  • #6
  • Envelope Size: 8.875 x 5.75
  • Document Enclosure Size: 8.625 x 5.5

  • #6 1/2
  • Envelope Size: 9 x 6
  • Document Enclosure Size: 8.75 x 5.75

  • #6 5/8
  • Envelope Size: 9.5 x 6
  • Document Enclosure Size: 9 x 5.75

  • #6 3/4
  • Envelope Size: 9.5 x 6.5
  • Document Enclosure Size: 9.25 x 6.25

  • #7
  • Envelope Size: 9.625 x 6.25
  • Document Enclosure Size: 9.375 x 6

  • #7 1/4
  • Envelope Size: 10 x 7
  • Document Enclosure Size: 9.75 x 6.75

  • #7 1/2
  • Envelope Size: 10.5 x 7.5
  • Document Enclosure Size: 10.25 x 7.25

  • #8
  • Envelope Size: 11.125 x 8
  • Document Enclosure Size: 10.875 x 7.75

  • #9
  • Envelope Size: 11.5 x 8.75
  • Document Enclosure Size: 11.25 x 8.5

  • #9 1/2
  • Envelope Size: 12 x 9
  • Document Enclosure Size: 11.75 x 8.75

  • #10
  • Envelope Size: 12.625 x 9.5
  • Document Enclosure Size: 12.125 x 9.25

  • #13
  • Envelope Size: 13 x 10
  • Document Enclosure Size: 12.75 x 9.75
 
 

 

Catalog Envelopes

Open-end style envelopes with wallet flaps and center seams, catalog envelopes are used for magazines, reports, catalogs, and other heavyweight materials. Policy envelopes, used for insurance policies, wills, mortgages, and other legal papers sometimes come with a full-view window on the face.

 

  • #7 Glove
  • Envelope Size: 4 x 6.375
  • Document Enclosure Size: 3.75 x 6.125

  • #8 Glove
  • Envelope Size: 3.875 x 7.5
  • Document Enclosure Size: 3.625 x 7.25

  • #9 Policy
  • Envelope Size: 4 x 9
  • Document Enclosure Size: 3.75 x 8.75

  • #10 Policy
  • Envelope Size: 4.125 x 9.5
  • Document Enclosure Size: 3.875 x 9.25

  • #11 Policy
  • Envelope Size: 4.5 x 10.375
  • Document Enclosure Size: 4.25 x 10.125

  • #12 Policy
  • Envelope Size: 4.75 x 10.875
  • Document Enclosure Size: 4.5 x 10.625

  • #14 Policy
  • Envelope Size: 5 x 11.5
  • Document Enclosure Size: 4.75 x 11.25

  • #1 Scarf
  • Envelope Size: 4.625 x 6.75
  • Document Enclosure Size: 4.375 x 6.5

  • #3 Scarf
  • Envelope Size: 5 x 7.5
  • Document Enclosure Size: 4.75 x 7.25

  • #4 1/4 Scarf
  • Envelope Size: 5.5 x 7.5
  • Document Enclosure Size: 5.25 x 7.25

  • #6 Scarf
  • Envelope Size: 5.5 x 8.25
  • Document Enclosure Size: 5.25 x 8

  • #1
  • Envelope Size: 6 x 9
  • Document Enclosure Size: 5.75 x 8.75

  • #1 3/4
  • Envelope Size: 6.5 x 9.5
  • Document Enclosure Size: 6.25 x 9.25

  • #2
  • Envelope Size: 6.5 x 10
  • Document Enclosure Size: 6.25 x 9.75

  • #3
  • Envelope Size: 7 x 10
  • Document Enclosure Size: 6.75 x 9.75

  • #6
  • Envelope Size: 7.5 x 10.5
  • Document Enclosure Size: 7.25 x 10.25

  • #7
  • Envelope Size: 8 x 11
  • Document Enclosure Size: 7.75 x 10.75

  • #8
  • Envelope Size: 8.25 x 11.25
  • Document Enclosure Size: 8 x 11

  • #9 1/2
  • Envelope Size: 8.5 x 10.5
  • Document Enclosure Size: 8.25 x 10.25

  • #9 3/4
  • Envelope Size: 8.75 x 11.25
  • Document Enclosure Size: 8.5 x 11

  • #10 1/2
  • Envelope Size: 9 x 12
  • Document Enclosure Size: 8.75 x 11.75

  • #12 1/2
  • Envelope Size: 9.5 x 12.5
  • Document Enclosure Size: 9.25 x 12.25

  • #13 1/2
  • Envelope Size: 10 x 13
  • Document Enclosure Size: 9.75 x 12.75

  • #14 1/4
  • Envelope Size: 11.25 x 14.25
  • Document Enclosure Size: 11 x 14

  • #14 1/2
  • Envelope Size: 11.5 x 14.5
  • Document Enclosure Size: 11.25 x 14.25

  • #15
  • Envelope Size: 10 x 15
  • Document Enclosure Size: 9.75 x 14.5

  • #15 1/2
  • Envelope Size: 12 x 15.5
  • Document Enclosure Size: 11.75 x 15.25