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Envelope Sizes

Envelopes come in a variety of sizes and colors. Select from the following options:

Standard Business

Widely used for business and personal correspondence.

No.

Size

6 1/4

3 1/2 x 6

6 3/4

3 5/8 x 6 1/2

7

3 3/4 x 6 3/4

7 3/4 (Monarch)

3 7/8 x 7 1/2

Check

3 5/8 x 8 5/8

9

3 7/8 x 8 7/8

10

4 1/8 x 9 1/2

11

4 1/2 x 10 3/8

12

4 3/4 x 11

14

5 x 11 1/2

 

Booklet

For use with booklets, folders, and other types of direct mail.

No.

Size

3

4 3/4 x 6 1/2

4 1/2

5 1/2 x 7 1/2

5

5 1/2 x 8 1/2

6

5 3/4 x 8 7/8

6 1/2

6 x 9

6 3/4

6 1/2 x 9 1/2

7 1/4

7 x 10

7 1/2

7 1/2 x 10 1/2

9

8 3/4 x 11 1/2

9 1/2

9 x 12

10

9 1/2 x 12 5/8

13

10 x 13

 

Catalog

Open-end style. Wide seams with heavy gummed flaps provide good protection for mail handling of catalogs, magazines, reports, etc.

No.

Size

1

6 x 9

1 3/4

6 1/2 x 9 1/2

3

7 x 10

6

7 1/2 x 10 1/2

9 3/4

8 3/4 x 11 1/4

10 1/2

9 x 12

12 1/2

9 1/2 x 12 1/2

13 1/2

10 x 13

14 1/2

11 1/2 x 14 1/2

15 1/2

12 x 15 1/2

 

Announcements

No.

Size

A-2

4 3/8 x 5 5/8

A-6

4 3/4 x 6 1/2

A-7

5 1/4 x 7 1/4

A-8

5 1/2 x 8 1/8

A-10

6 1/4 x 9 5/8

Slimline

3 7/8 x 8 7/8

 

Baronial

Formal envelopes with deep pointed flap. Widely used for invitations, announcements, and greeting and social cards.

No.

Size

4

3 5/8 x 4 5/8

5

4 1/8 x 5 1/8

5 1/2

4 3/8 x 5 3/4

6

4 3/4 x 6 1/2

Single Window Envelopes
Nearly each envelope type and size may have a window. The most common (and recommended by USPS) window size is 1 1/8 x 4 1/2, and the position 7/8 in from left and 1/2 (often 5/8) in from bottom.

 

Double Window Envelopes

Such envelopes are often used for checks and invoices. The three most popular envelope sizes with double windows are #10. #9 and check.