Standard Sizes and Dimensions for Envelope Enclosures

Learn more about envelope types and typical uses

Explore common envelope styles, construction, usage and sizes as well as dimensions of standard envelopes and their envelopes.

Announcements / Invitation envelopes

Style A envelopes are typically used for greeting cards, announcements, informal invitations and small booklets.

Common A-Series Envelope Sizes and Box Dimensions Send greetings, announcements, and invitations in an A-style envelope.
Lifewire/Jacci Howard Bear

Open side envelopes with square, often deep flaps and side seams, these envelopes, also called A-Style or A-Line, may have fringed edges on the top flap and are often used with matching text and cover papers in white and in color. You can find the announcement and other envelopes called invitation, greeting card or personal correspondence envelopes. Look at the size and flap/seam style to know exactly which style you are getting.

The following list shows the name/number designation, enclosure dimensions, and approximate maximum enclosure dimensions for some of the more common sizes of the A-Series enclosure style. Actual enclosure dimensions will depend on the thickness of the attachment (thickness of the paper, number of pages).

A1
5.125 x 3.625
4.75×3.5

A2
5.75×4.375
5.5×4.125

A6
6.5×4.75
6.25×4.5

A-7
7.25×5.25
7×5

AT 8
8.125 x 5.5
7.875×5.25

On
(slim line)
8.875 x 3.875
8.625 x 3.625

A10
9.5×6
9.25×5.75

All measurements in inches: .125 = 1/8 | .25 = 1/4 | .375 = 3/8 | .5 = 1/2 | .625 = 5/8 | .875 = 7/8

These Series A envelope sizes apply specifically to the United States. Standard international envelope sizes differ.

Baronial envelopes

Common baronial envelope sizes and enclosure dimensions Send official announcements or use baronial envelopes with sophisticated social stationery.
Lifewire/Jacci Howard Bear

Used for formal invitations, greeting cards, and some stationery, Baronial is an open-sided, nearly square envelope with pointed flaps and diagonal seams.

The inner/outer envelope sets come with the (slightly smaller) inner envelope ungummed.

The following list shows the name/number designation, envelope dimensions, and approximate maximum enclosure dimensions for some of the more common sizes of this style of envelope. The actual dimensions of attachments will depend on the thickness of the attachment (thickness of paper, number of pages).

2
4.25×3.1875
4×2.9375

4
5.125 x 3.625
4.875 x 3.375

5
5.625 x 4.125
5.375 x 3.875

5 ¼
5.25×4.25
5×4

5 ½
5.625 x 4.375
5.375 x 4.125

6
6.5×4.75
6.25×4.625

Gladstone
5.5625×3.5625
5.375 x 3.375

astor
5.625 x 3.625
5.375×3.5

Lee
7.25×5.25
7×5.125

All measurements in inches: .125 = 1/8 | .25 = 1/4 | .375 = 3/8 | .5 = 1/2 | .625 = 5/8 | .875 = 7/8

These baronial envelope sizes apply specifically to the United States. Standard international envelope sizes differ.

booklet envelopes

Common Booklet Envelope Sizes and Envelope Dimensions Booklet envelopes hold more than just booklets.
Lifewire/Jacci Howard Bear

Open side envelopes with small square or wallet flaps and side seams, booklet envelopes are ideal for printing and mailing.

Booklet envelopes are used not only for booklets, but also for brochures, catalogs, annual reports and other multi-page mailings. They work well with automatic insertion machines.

The following list shows the name/number designation, envelope dimensions, and approximate maximum envelope dimensions for some of the more common sizes of the booklet envelope style. The actual dimensions of attachments will depend on the thickness of the attachment (thickness of paper, number of pages).

3
6.5×4.75
6.25×4.5

4 ¼
7.5×5
7.25×4.75

4 ½
7.5×5.5
7.25×5.25

5
8.5×5.5
8.25×5.25

6
8.875×5.75
8.625×5.5

6 ½
9×6
8.75×5.75

6 5/8
9.5×6
9×5.75

6 ¾
9.5×6.5
9.25×6.25

7
9.625×6.25
9.375×6

7 ¼
10×7
9.75×6.75

7 ½
10.5×7.5
10.25×7.25

8
11.125×8
10.875×7.75

9
11.5×8.75
11.25×8.5

9 ½
12×9
11.75×8.75

ten
12.625×9.5
12.125 x 9.25

13
13×10
12.75×9.75

All measurements in inches: .125 = 1/8 | .25 = 1/4 | .375 = 3/8 | .5 = 1/2 | .625 = 5/8 | .875 = 7/8

These booklet envelope sizes apply specifically to the United States. Standard international envelope sizes differ.

Catalog envelopes

Common Catalog Envelope Sizes and Box Dimensions Use catalog envelopes for heavy materials such as magazines and catalogs.
Lifewire/Jacci Howard Bear

Typically open-ended envelopes with portfolio flaps and center seams, catalog envelopes are used for magazines, reports, catalogs and other heavy materials.

Police envelopes, used for insurance policies, wills, mortgages and other legal documents, sometimes have a panoramic window on the face.

The following list shows the name/number designation, envelope dimensions, and approximate maximum enclosure dimensions for some of the more common sizes of this style of envelope. The actual dimensions of attachments will depend on the thickness of the attachment (thickness of paper, number of pages).

1
6×9
5.75×8.75

1 ¾
6.5×9.5
6.25×9.25

2
6.5×10
6.25×9.75

3
7×10
6.75×9.75

6
7.5×10.5
7.25×10.25

7
8×11
7.75×10.75

8
8.25×11.25
8×11

9 Policy
4×9
3.75×8.75

9 ½
8.5×10.5
8.25×10.25

9 ¾
8.75×11.25
8.5×11

10 Policy
4.125 x 9.5
3.875×9.25

10 ½
9×12
8.75×11.75

11 Policy
4.5×10.375
4.25×10.125

12 Policy
4.75×10.875
4.5×10.625

12 ½
9.5×12.5
9.25×12.25

13 ½
10×13
9.75×12.75

14 Policy
5×11.5
4.75×11.25

14 ¼
11.25×14.25
11×14

14 ½
11.5×14.5
11.25×14.25

15
10×15
9.75×14.5

15 ½
12×15.5
11.75×15.25

All measurements in inches: .125 = 1/8 | .25 = 1/4 | .375 = 3/8 | .5 = 1/2 | .625 = 5/8 | .875 = 7/8

These catalog envelope sizes apply specifically to the United States. Standard international envelope sizes differ.

Business envelopes

Common Business Envelope Sizes and Envelope Dimensions The #10 business envelope is the most popular size for business and personal correspondence.
Lifewire/Jacci Howard Bear

Used for business, direct mail, personal correspondence and direct mail style envelopes, the business envelope style includes the standard, readily available #10 envelope.

Also called business, standard, or official, business envelopes are open side envelopes typically with business style flaps and diagonal seams, although some sizes come with side seams and square/wallet or pointed flaps. The Monarch is a variation of the #7 ¾ envelope but with a pointed flap. The windowed version has single or double windows that allow addresses to appear through the face of the envelope. They are normally used for invoices or billing statements, paychecks and receipts.

The following list shows the name/number designation, envelope dimensions, and approximate maximum enclosure dimensions for some of the more common sizes of this style of envelope. The actual dimensions of attachments will depend on the thickness of the attachment (thickness of paper, number of pages).

#5
5.5×3.0625
5.25×2.8125

#6
6×3.375
5.75×3.125

#6 ¼
6×3.5
5.75×3.25

#6 ½
6.25×3.5625
6×3.3125

#6 ¾
6.5×3.625
6.25×3.5

#7
6.75×3.75
6.5×3.5

#7 ½
7.625×3.75
7.375×3.5

#7 ¾ & monarch
7.5×3.875
7.25×3.75

To verify
8.625 x 3.625
8.375×3.5

#9
8.875 x 3.875
8.625×3.75

#ten
9.5×4.125
9.25×3.875

#10 ½
9.5×4.5
9.25×4.25

#11
10.375×4.5
10.125×4.25

#12
11×4.75
10.75×4.5

#14
11.5×5
11.25×4.75

#16
12×6
11.75×5.75

All measurements in inches: .125 = 1/8 | .25 = 1/4 | .375 = 3/8 | .5 = 1/2 | .625 = 5/8 | .875 = 7/8

These trade envelope sizes apply specifically to the United States. Standard international envelope sizes differ.

Square envelopes

Common Square Envelope Sizes and Envelope Dimensions Square envelopes look great, but can cost more than other styles.
Lifewire/Jacci Howard Bear

With their large square (and sometimes pointed) flaps and side seams, square envelopes are distinctive, but the non-standard size and shape can potentially increase postage costs. Some sizes of square envelopes cannot be mailed unless placed in a larger, mailable envelope.

Square envelopes are primarily used with announcements, advertisements and specialty greeting cards or other mailings where the sender wishes to draw attention to the contents before the envelope is even opened.

The following list shows the name/number designation, enclosure dimensions, and approximate maximum enclosure dimensions for some of the more common sizes of the square enclosure style. The actual dimensions of attachments will depend on the thickness of the attachment (thickness of paper, number of pages).

5
5×5
4.75×4.75

6
6×6
5.75×5.75

6 ½
6.5×6.5
6.25×6.25

7
7×7
6.75×6.75

7 ½
7.5×7.5
7.25×7.25

8
8×8
7.75×7.75

8 ½
8.5×8.5
8.25×8.25

9
9×9
8.75×8.75

9 ½
9.5×9.5
9.25×9.25

ten
10×10
9.75×9.75

13 ½
13.5×13.5
13.25×13.25

All measurements in inches: .125 = 1/8 | .25 = 1/4 | .375 = 3/8 | .5 = 1/2 | .625 = 5/8 | .875 = 7/8

These square envelope sizes apply specifically to the United States. Standard international envelope sizes differ.


More information about Standard Sizes and Dimensions for Envelope Enclosures

Learn about envelope types and typical uses

Explore common envelope styles, construction, usage, and sizes along with dimensions for standard envelopes and their enclosures.

Announcement / Invitation Envelopes

Typical uses of the A-Style envelopes are for greeting cards, announcements, informal invitations, and small booklets.

Common A Series Envelope Sizes and Enclosure Dimensions Send your greetings, announcements, and invitations in an A-Style envelope.
Lifewire / Jacci Howard Bear
Open side envelopes with square, often deep flaps and side seams, these envelopes, also called A-Style or A-Line, can have deckle edges on the top flap and are often used with matching text and cover papers in white and colors. You may find ​the announcement and other envelopes called invitation, greeting card, or personal correspondence envelopes. Look at the size and flap/seam style to know exactly what style you’re getting.

The following list shows the name/number designation, envelope dimensions, and approximate maximum enclosure dimensions for some of the more common sizes of the A-series envelope style. Actual dimensions for enclosures will depend on the thickness of the enclosure (paper thickness, number of pages).

A15.125 x 3.6254.75 x 3.5

A25.75 x 4.3755.5 x 4.125

A66.5 x 4.756.25 x 4.5

A-77.25 x 5.257 x 5

A88.125 x 5.57.875 x 5.25

A-Long(Slimline)8.875 x 3.8758.625 x 3.625

A109.5 x 69.25 x 5.75

All measurements in inches: .125 = 1/8 | .25 = 1/4 | .375 = 3/8 | .5 = 1/2 | .625 = 5/8 | .875 = 7/8

These A series envelope sizes apply specifically to the United States. Standard International envelope sizes differ.

Baronial Envelopes
Common Baronial Envelope Sizes and Enclosure Dimensions Send formal announcements or use Baronial envelopes with fancy social stationery.
Lifewire / Jacci Howard Bear
Used for formal invitations, greeting cards, and some stationery, Baronial is an open side, almost square envelope with pointed flaps and diagonal seams.

Inner/Outer envelope sets come with the (slightly smaller) inner envelope ungummed.

The following list shows the name/number designation, envelope dimensions, and approximate maximum enclosure dimensions for some of the more common sizes of this envelope style. Actual dimensions for enclosures will depend on the thickness of the enclosure (paper thickness, number of pages).

24.25 x 3.18754 x 2.9375

45.125 x 3.6254.875 x 3.375

55.625 x 4.1255.375 x 3.875

5 ¼5.25 x 4.255 x 4

5 ½5.625 x 4.3755.375 x 4.125

66.5 x 4.756.25 x 4.625

Gladstone5.5625 x 3.56255.375 x 3.375

Astor5.625 x 3.6255.375 x 3.5

Lee7.25 x 5.257 x 5.125

All measurements in inches: .125 = 1/8 | .25 = 1/4 | .375 = 3/8 | .5 = 1/2 | .625 = 5/8 | .875 = 7/8

These Baronial envelope sizes apply specifically to the United States. Standard International envelope sizes differ.

Booklet Envelopes
Common Booklet Envelope Sizes and Enclosure Dimensions Booklet envelopes hold more than just booklets.
Lifewire / Jacci Howard Bear
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. They work well with automatic insertion machines.

The following list shows the name/number designation, envelope dimensions, and approximate maximum enclosure dimensions for some of the more common sizes of the booklet envelope style. Actual dimensions for enclosures will depend on the thickness of the enclosure (paper thickness, number of pages).

36.5 x 4.756.25 x 4.5

4 ¼7.5 x 57.25 x 4.75

4 ½7.5 x 5.57.25 x 5.25

58.5 x 5.58.25 x 5.25

68.875 x 5.758.625 x 5.5

6 ½9 x 68.75 x 5.75

6 5/89.5 x 69 x 5.75

6 ¾9.5 x 6.59.25 x 6.25

79.625 x 6.259.375 x 6

7 ¼10 x 79.75 x 6.75

7 ½10.5 x 7.510.25 x 7.25

811.125 x 810.875 x 7.75

911.5 x 8.7511.25 x 8.5

9 ½12 x 911.75 x 8.75

1012.625 x 9.512.125 x 9.25

1313 x 1012.75 x 9.75

All measurements in inches: .125 = 1/8 | .25 = 1/4 | .375 = 3/8 | .5 = 1/2 | .625 = 5/8 | .875 = 7/8

These booklet envelope sizes apply specifically to the United States. Standard International envelope sizes differ.

Catalog Envelopes
Common Catalog Envelope Sizes and Enclosure Dimensions Use catalog envelopes for heavy material like magazines and catalogs.
Lifewire / Jacci Howard Bear
Usually open-end envelopes with wallet flaps and center seams, catalog envelopes are used for magazines, reports, catalogs, and other heavy-weight materials.

Policy envelopes, used for insurance policies, wills, mortgages, and other legal papers sometimes come with a full-view window on the face.

The following list shows the name/number designation, envelope dimensions, and approximate maximum enclosure dimensions for some of the more common sizes of this envelope style. Actual dimensions for enclosures will depend on the thickness of the enclosure (paper thickness, number of pages).

16 x 95.75 x 8.75

1 ¾6.5 x 9.56.25 x 9.25

26.5 x 106.25 x 9.75

37 x 106.75 x 9.75

67.5 x 10.57.25 x 10.25

78 x 117.75 x 10.75

88.25 x 11.258 x 11

9 Policy4 x 93.75 x 8.75

9 ½8.5 x 10.58.25 x 10.25

9 ¾8.75 x 11.258.5 x 11

10 Policy4.125 x 9.53.875 x 9.25

10 ½9 x 128.75 x 11.75

11 Policy4.5 x 10.3754.25 x 10.125

12 Policy4.75 x 10.8754.5 x 10.625

12 ½9.5 x 12.59.25 x 12.25

13 ½10 x 139.75 x 12.75

14 Policy5 x 11.54.75 x 11.25

14 ¼11.25 x 14.2511 x 14

14 ½11.5 x 14.511.25 x 14.25

1510 x 159.75 x 14.5

15 ½12 x 15.511.75 x 15.25

All measurements in inches: .125 = 1/8 | .25 = 1/4 | .375 = 3/8 | .5 = 1/2 | .625 = 5/8 | .875 = 7/8

These catalog envelope sizes apply specifically to the United States. Standard International envelope sizes differ.

Commercial Envelopes
Common Commercial Envelope Sizes and Enclosure Dimensions The #10 commercial envelope is the most popular size for business and personal correspondence.
Lifewire / Jacci Howard Bear
Used for business, direct mail, and personal correspondence, and direct-mail style envelopes, the commercial envelope style includes the standard, readily available #10 envelope.

Also called business, standard, or officials, commercial envelopes are open side envelopes usually with commercial style flaps and diagonal seams although some sizes come with side seams and square/wallet or pointed flaps. The Monarch is a variation of the #7 ¾ envelope but with a pointed flap. The window version has single or double windows that allow addresses to show through the face of the envelope. They are normally used for invoices or billing statements, paychecks, and receipts.

The following list shows the name/number designation, envelope dimensions, and approximate maximum enclosure dimensions for some of the more common sizes of this envelope style. Actual dimensions for enclosures will depend on the thickness of the enclosure (paper thickness, number of pages).

#55.5 x 3.06255.25 x 2.8125

#66 x 3.3755.75 x 3.125

#6 ¼6 x 3.55.75 x 3.25

#6 ½6.25 x 3.56256 x 3.3125

#6 ¾6.5 x 3.6256.25 x 3.5

#76.75 x 3.756.5 x 3.5

#7 ½7.625 x 3.757.375 x 3.5

#7 ¾ & Monarch7.5 x 3.8757.25 x 3.75

Check8.625 x 3.6258.375 x 3.5

#98.875 x 3.8758.625 x 3.75

#109.5 x 4.1259.25 x 3.875

#10 ½9.5 x 4.59.25 x 4.25

#1110.375 x 4.510.125 x 4.25

#1211 x 4.7510.75 x 4.5

#1411.5 x 511.25 x 4.75

#1612 x 611.75 x 5.75

All measurements in inches: .125 = 1/8 | .25 = 1/4 | .375 = 3/8 | .5 = 1/2 | .625 = 5/8 | .875 = 7/8

These commercial envelope sizes apply specifically to the United States. Standard International envelope sizes differ.

Square Envelopes
Common Square Envelope Sizes and Enclosure Dimensions Square envelopes look great but can cost more to mail than other styles.
 Lifewire / Jacci Howard Bear
With their large square flaps (and sometimes pointed flaps) and side seams, square envelopes are distinctive but the nonstandard size and shape can potentially increase postage costs. Some sizes of square envelopes cannot be mailed unless placed inside a larger, mailable envelope.

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 before the envelope is even open.

The following list shows the name/number designation, envelope dimensions, and approximate maximum enclosure dimensions for some of the more common sizes of the square envelope style. Actual dimensions for enclosures will depend on the thickness of the enclosure (paper thickness, number of pages).

55 x 54.75 x 4.75

66 x 65.75 x 5.75

6 ½6.5 x 6.56.25 x 6.25

77 x 76.75 x 6.75

7 ½7.5 x 7.57.25 x 7.25

88 x 87.75 x 7.75

8 ½8.5 x 8.58.25 x 8.25

99 x 98.75 x 8.75

9 ½9.5 x 9.59.25 x 9.25

1010 x 109.75 x 9.75

13 ½ 13.5 x 13.513.25 x 13.25

All measurements in inches: .125 = 1/8 | .25 = 1/4 | .375 = 3/8 | .5 = 1/2 | .625 = 5/8 | .875 = 7/8

These square envelope sizes apply specifically to the United States. Standard International envelope sizes differ.

#Standard #Sizes #Dimensions #Envelope #Enclosures


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