Envelope Sizing Guide

Tools You Can Use

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.
A blue envelope with a white envelope size guide on it.

#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
A blue envelope with a white envelope on it following an envelope size guide.
A blue envelope on a white background follows an envelope size guide.

#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
A blue envelope with a white envelope on it following an envelope size guide.
A blue envelope with a guide to envelope sizes on it.

#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
A guide to envelope sizes: a blue envelope on a white background.
A blue envelope on a white background, as per the Envelope Size Guide.
#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
A blue envelope on a white background with an envelope size guide.
A blue envelope with an envelope size guide on it.

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
A blue envelope on a white background, featuring an envelope size guide.
A blue envelope on a white background follows a size envelope guide.

#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
A blue envelope with a white envelope on it, featuring an envelope size guide.
#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
A size envelope guide: A blue envelope on a white background.
A guide to envelope sizes: a blue envelope on a white background.

#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
A blue envelope on a white background, following the Envelope Size Guide.
#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.

A white envelope with dots on it, following the a size envelope guide.
A white envelope on a white background, accompanied by an envelope size guide.
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
A white envelope on a white background, adhering to the envelope size guide.
A white envelope on a white background, demonstrating a guide to envelope sizes.
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
A blue envelope with white dots on it and an Envelope Size Guide.
A blue envelope, with an envelope size guide on it, on a white background.
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
A white envelope, according to the Envelope Size Guide, on a white background.
A white envelope on a white background as per the envelope size guide.
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
A white envelope, detailed in an Envelope Size Guide, on a white background.
A guide to envelope sizes displayed on a white background.
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.

A blue square envelope with white dots on it comes with an envelope size guide.
A white envelope with a blue polka dot pattern according to the Envelope Size Guide.
5
Envelope Size:
5 x 5
Document Enclosure Size:
4.75 x 4.7
5 1/2
Envelope Size:
5.5 x 5.5
Document Enclosure Size:
5.25 x 5.25
A white envelope with a blue polka dot pattern and an envelope size guide.
A white envelope with a blue background and an envelope size guide.
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
A white envelope with a light blue background featuring an envelope size guide.
A guide to envelope sizes: a white envelope with a blue background.
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
A light blue envelope on a white background, following an envelope size guide.
A white envelope with a light blue background, following the envelope size guide.
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
A white envelope with a blue background and a size envelope guide.
An envelope with a light blue background featuring an Envelope Size Guide.
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
A white envelope with a light blue background and an envelope size guide.
A blue envelope with a white background, including an envelope size guide.
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

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.

A white envelope on a white background with an envelope size guide.
A white envelope on a white background, accompanied by an Envelope Size Guide.
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 white square envelope on a white background, following a guide to envelope sizes.
A white envelope, fitting the guide to envelope sizes, on a white background.
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 white envelope on a white background, following an envelope size guide.
A white envelope on a white background, featuring an Envelope Size Guide.
A-8
Envelope Size:
8.125 x 5.5
Document Enclosure Size:
7.875 x 5.25
Similine A-10
Envelope Size:
8.875 x 3.875
Document Enclosure Size:
8.625 x 3.625
A white envelope according to an A size envelope guide on a white background.
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.

A brown envelope from an envelope size guide on a white background.
An image of a brown envelope on a white background, featuring an Envelope Size Guide.
#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
A brown envelope on a white background, as indicated in an envelope size guide.
An image of a brown envelope on a white background, featuring an envelope size guide.
#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
A beige envelope icon on a white background, serving as a guide to envelope sizes.
A brown envelope on a white background as per the envelope size guide.
#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
A brown envelope, featured in an envelope size guide, on a white background.
A brown envelope on a white background as per the envelope size guide.
#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
A brown envelope featuring a guide to envelope sizes on a white background.
A brown envelope on a white background, following a guide to envelope sizes.
#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
A brown envelope on a white background, guide to envelope sizes.
A brown envelope, following the guide to envelope sizes, on a white background.
#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
A beige envelope on a white background, adhering to an envelope size guide.
A beige envelope size guide on a white background.
#9
Envelope Size:
111.5 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
A beige envelope on a white background, including a guide to envelope sizes.
A brown envelope on a white background with an envelope size guide.
#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
A picture of a wooden box with a door on it, including an envelope size guide.
A tan envelope with a brown background and an envelope size guide.
#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
A tan envelope with a brown background and an envelope size guide.
A wooden door on a white background, featuring a guide to envelope sizes.
#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
A wooden door with a wooden frame and an envelope size guide.
A tan envelope with a brown background, following a size envelope guide.
#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
A tan envelope on a white background, following an A size envelope guide.
An envelope with a beige background and an envelope size guide.
#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
A brown envelope on a white background, adhering to the envelope size guide.
A beige envelope on a white background, featuring an envelope size guide.
#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
A wooden door with a wooden frame and an envelope size guide.
A tan envelope on a white background, following an A size envelope guide.
#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
A brown envelope on a white background follows the Envelope Size Guide.
A wooden envelope with a brown background and an envelope size guide.
#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
A guide to envelope sizes: a brown envelope on a white background.
A wooden envelope with a brown background, following the Envelope Size Guide.
#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
A size envelope guide: A brown envelope on a white background.
An image of a brown envelope on a white background, featuring an Envelope Size Guide.
#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
A brown envelope, following the envelope size guide, on a white background.
A tan envelope with a brown background and an Envelope Size Guide.
#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
A tan envelope with a brown background and an Envelope Size Guide.
An envelope with a brown background and an envelope size guide.
#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
A brown envelope on a white background, featuring an Envelope Size Guide.
#14 1/2
Envelope Size:
12 x 15.5
Document Enclosure Size:
11.75 x 15.25

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