Standard Envelope Sizes and Dimensions

Learn the general styles, construction, uses, and sizes of envelopes, as well as the dimensions of standard envelopes and their bodies.

Typical uses for A-style envelopes include greeting cards, announcements, casual invitations, and small booklets.

Contents
  1. Announcements/Invitations Envelopes
  2. Baronial Envelopes
  3. Booklet Envelopes
  4. Catalog Envelopes
  5. Commercial Envelopes
  6. Square Envelopes

Announcements/Invitations Envelopes

Open sided envelopes with square, often deep flaps and side seams, these envelopes – also called A-Style or A-Line – may have top flap cover edges and are often used with matching text and white and color covers. You can find announcement and other envelopes called invitation cards, greeting cards, or personal envelopes. Look at the patch/seam size and style to know exactly which style you will receive.

The following list shows the name/number designation, envelope dimensions, and approximate maximum body measurements for some of the most common A-series envelope sizes. Actual dimensions will vary depending on case thickness (paper thickness, number of pages).

A1
5.125 x 3.625
4.75 x 3.5″

A2
5.75 x 4.375
5.5 x 4.125

A6
6.5 x 4.75″
6.25 x 4.5″

A-7
7.25 x 5.25″
7×5

A8
8.125×5.5
7.875 x 5.25″

By
slim line
8.875 x 3.875
8.625 x 3.625

A10
9.5×6
9.25 x 5.75″

All dimensions in inches: .125 = 1/8 | 0.25 = 1/4 | .375 = 3/8 | .5 = 1/2 | .625 = 5/8 | .875 = 7/8
These Series A envelope sizes are specific to the United States. Standard international envelope sizes vary.

Baronial Envelopes

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

Inner/outer envelope sets come with a (slightly smaller) non-gummed inner envelope.

The following list contains the name/number designation, envelope dimensions, and approximate maximum body measurements for some of the most common sizes for this type of envelope. The actual dimensions of the cases depend on the thickness of the case (paper thickness, number of pages).

2
4.25 x 3.1875
4x 2.9375

4
5.125 x 3.625
4.875 x 3.375

five
5.625 x 4.125
5.375 x 3.875

5
5.25 x 4.25″
5×4


5.625 x 4.375
5.375 x 4.125

6
6.5 x 4.75″
6.25 x 4.625

gladstone
5.5625 x 3.5625
5.375 x 3.375

Astor
5.625 x 3.625
5.375 x 3.5″

Lee
7.25 x 5.25″
7 x 5.125

All dimensions in inches: .125 = 1/8 | 0.25 = 1/4 | .375 = 3/8 | .5 = 1/2 | .625 = 5/8 | .875 = 7/8
These Baronial envelope sizes are specific to the US. Standard international envelope sizes vary.

Booklet Envelopes

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

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

The following list includes name/number designation, envelope dimensions, and approximate maximum body measurements for some of the most common booklet cover formats. The actual dimensions of the cases depend on the thickness of the case (paper thickness, number of pages).

3
6.5 x 4.75″
6.25 x 4.5″

4
7.5×5
7.25 x 4.75″


7.5×5.5
7.25 x 5.25″

five
8.5×5.5
8.25 x 5.25″

6
8.875 x 5.75
8.625 x 5.5″


9×6
8.75 x 5.75″

6 5/8
9.5×6
9×5.75


9.5 x 6.5″
9.25 x 6.25″

7
9.625 x 6.25″
9.375×6

7
10×7
9.75 x 6.75″


10.5 x 7.5″
10.25 x 7.25″

8
11.125×8
10.875 x 7.75″

nine
11.5 x 8.75″
11.25 x 8.5″


12×9
11.75 x 8.75″

10
12,625 x 9.5
12.125 x 9.25″

13
13×10
12.75 x 9.75″

All dimensions in inches: .125 = 1/8 | 0.25 = 1/4 | .375 = 3/8 | .5 = 1/2 | .625 = 5/8 | .875 = 7/8
These booklet envelope sizes are US specific. Standard international envelope sizes vary.

Catalog Envelopes

Usually open envelopes with flaps and center seams, catalog envelopes are used for magazines, reports, catalogs and other heavy material.

Policy envelopes used for insurance policies, wills, mortgages, and other legal documents sometimes have a full viewing window.

The following list contains the name/number designation, envelope dimensions, and approximate maximum body measurements for some of the most common sizes for this type of envelope. The actual dimensions of the cases depend on the thickness of the case (paper thickness, number of pages).

a
6×9
5.75 x 8.75″

1
6.5 x 9.5
6.25 x 9.25″

2
6.5×10
6.25 x 9.75″

3
7×10
6.75 x 9.75″

6
7.5 x 10.5
7.25 x 10.25″

7
8×11
7.75 x 10.75″

8
8.25 x 11.25″
8×11

Politics 9
4×9
3.75 x 8.75″


8.5 x 10.5
8.25 x 10.25″

9
8.75 x 11.25″
8.5×11

10 lines
4.125 x 9.5″
3.875 x 9.25″

10½
9×12
8.75 x 11.75″

11 Politics
4.5 x 10.375
4.25 x 10.125

12 Politics
4.75 x 10.875
4.5 x 10.625

12½
9.5 x 12.5″
9.25×12.25″

13½
10×13
9.75 x 12.75″

14 Politics
5x 11.5
4.75 x 11.25″

14 years
11.25×14.25″
11×14

14½
11.5 x 14.5″
11.25×14.25″

15
10×15
9.75×14.5

15½
12×15.5
11.75 x 15.25″

All dimensions in inches: .125 = 1/8 | 0.25 = 1/4 | .375 = 3/8 | .5 = 1/2 | .625 = 5/8 | .875 = 7/8
These catalog envelope sizes only apply to the United States. Standard international envelope sizes vary.

Commercial Envelopes

Used for business envelopes, mailing lists, personal correspondence and direct mail style envelopes, the commercial envelope includes a standard, easily accessible #10 envelope.

Commercial standard or formal commercial envelopes are also open side envelopes, usually with commercial style flaps and diagonal seams, although some sizes have side seams and square/paper or pointed flaps. The Monarch is a variant of the No. 7 envelope, but with a pointed flap. The windowed version has single or double windows that allow addresses to be displayed across the front of the envelope. They are often used for invoices or statements, checks and checks.

The following list contains the name/number designation, envelope dimensions, and approximate maximum body measurements for some of the most common sizes for this type of envelope. The actual dimensions of the cases depend on the thickness of the case (paper thickness, number of pages).

# five
5.5 x 3.0625
5.25 x 2.8125

#6
6 x 3.375
5.75 x 3.125″

#6
6x 3.5
5.75 x 3.25″

#6½
6.25 x 3.5625″
6 x 3.3125

#6
6.5 x 3.625
6.25 x 3.5″

#7
6.75 x 3.75″
6.5 x 3.5″

#7½
7.625 x 3.75″
7.375×3.5″

#7 and Monarch
7.5 x 3.875
7.25 x 3.75″

Verify
8.625 x 3.625
8.375 x 3.5″

# nine
8.875 x 3.875
8.625 x 3.75

#10
9.5 x 4.125
9.25 x 3.875

#10½
9.5 x 4.5″
9.25 x 4.25″

# elf
10.375 x 4.5″
10.125 x 4.25″

#12
11 x 4.75
10.75 x 4.5″

# fourteen
11.5×5
11.25 x 4.75″

#16
12×6
11.75 x 5.75″

All dimensions in inches: .125 = 1/8 | 0.25 = 1/4 | .375 = 3/8 | .5 = 1/2 | .625 = 5/8 | .875 = 7/8
These commercial envelope sizes are US specific. Standard international envelope sizes vary.

Square Envelopes

Square envelopes have large square flaps (and sometimes pointed flaps) and side seams, but custom sizes and shapes can increase shipping costs. Certain sized square envelopes cannot be shipped unless placed in a larger mailer envelope.

Square envelopes are mainly used for announcements, advertisements, special greeting cards or other mail items where the sender wants to draw attention to the contents before opening the envelope.

The following list includes name/number designation, envelope measurements, and approximate maximum body measurements for some of the most common square envelope style sizes. The actual dimensions of the cases depend on the thickness of the case (paper thickness, number of pages).

five
5×5
4.75 x 4.75″

6
6×6
5.75 x 5.75″


6.5 x 6.5
6.25 x 6.25″

7
7×7
6.75 x 6.75″


7.5 x 7.5″
7.25 x 7.25″

8
8 x 8
7.75 x 7.75″


8.5 x 8.5
8.25 x 8.25″

nine
9×9
8.75 x 8.75″


9.5 x 9.5″
9.25 x 9.25″

10
10×10
9.75 x 9.75″

13½
13.5 x 13.5
13.25 x 13.25″

All dimensions in inches: .125 = 1/8 | 0.25 = 1/4 | .375 = 3/8 | .5 = 1/2 | .625 = 5/8 | .875 = 7/8
These square envelope sizes are US specific. Standard international envelope sizes vary.

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