Free Envelope Templates (Different Envelop Sizes and Their Uses)

Envelopes are a common way of personal mailing, business correspondence, and marketing materials. Envelopes play an integral role in both improving the effectiveness of both direct and personal mails all over the world. They are just as important as the message they are delivering.

First impressions matter in both your private and professional life. Just like you would dress up professionally for a job interview to give a great first impression, your envelopes should also look sharp and ready to impress the recipient of the letter. Therefore, knowing the different types of envelopes and their uses is important.

Dealing with envelopes can be very complicated, especially if you are not used to dealing with them regularly as there are very many different envelope types and sizes available in the market today. In this article, we will be illuminating the different types of envelopes and how to use them.

Construction

Below is an illustration of the various parts of an envelope. The variations of these parts create the different types of envelopes we have today.

The envelopes with the seal flap and the opening located on the shorter dimension are referred to as Open-End envelopes, while those with the flap located on the long dimension are referred to as Open Side envelopes.

Flap Styles

The flap is the part of the envelope used to seal the envelope. The main and most common types of flaps include:

Sizes and Styles

In this article, we shall be expounding on the two main envelopes standard system. The first one is known as the Standard- used in the USA, and the other is the ISO metric system used in Europe and many other parts of the world.

Standard (US)

Standard envelopes are divided into several groups based on their style and application. The sizes are listed in inches, the shortest dimension first.

Commercial

Commercial sized envelopes, also known as business envelopes, are one of the most popularly used envelopes today. They are convenient for machine use and can go for a side seam or commercial flap with most machines. Commercial envelopes are usually used for letterheads, invoices, checks, statements, direct marketing mailings, and writing stationery.

TypeSize
6 ¼3 ½ inches by 6 inches
6 ¾3.625 inches by 6 ½ inches
8 5/83.625 inches by 8.625 inches
73 ¾ inches by 6 ¾ inches
7 ¾3.875 inches by 7 ½ inches
93.875 by 8.875
9 (policy)4 inches by 9 inches
104.125 inches by 9 ½ inches
DL4.313 inches by 8.625 inches
114 ½ inches by 10.375 inches
124 ¾ inches by 11 inches
145 inches by 11 ½ inches
166 inches by 12 inches

Announcement

Announcement envelopes also known as the “A” series envelopes, are very common. The flaps can either be pointed or flat. They are commonly used for announcements, cards, invitations, small booklets, promotional pieces, and brochures.

TypeSize
A033.1 inches by 46.8 inches
A123.4 inches by 33.1 inches
A216 ½ inches by 23.4 inches
A311.7 inches by 16 ½ inches
A48.3 inches by 11.7 inches
A55.8 inches by 8.3 inches
A64.1 inches by 5.8 inches
A72.9 inches by 4.1 inches
A82 inches by 2.9 inches
A91 ½ inch by 2 inches
A101 inch by 1 ½ inch

Baronial

Baronial envelopes are more formal envelopes. They are deeper and typically use a pointed flap. They are commonly used for official invitations.

TypeSize
23 3/16 inches by 4 ¼ inches
43 5/8 inches by 4 5/8 inches
54 1/8 inches by 5 1/8 inches
5 ¼4 ¼ inches by 5 ¼ inches
5 ½4 3/8 inches by 5 ¼ inches
5 ¾4 ½ inches by 5 ¾ inches
65 inches by 6 inches

Booklet

Booklet style envelopes are usually used for mailing brochures, catalogues, and the likes. They are also used for mailing sales materials and annual reports.

TypeSize
34 ¾ inches by 6 ½ inches
4 ½5 ½ inches by 7 ½ inches
55 ½ inches by 8.125 inches
65 ¾ inches by 8.875 inches
6 ½6 inches by 9 inches
6.6256 inches by 9 ½ inches
6 ¾6 ½ inches by 9 ½ inches
7 ¼7 inches by 10 inches
7 ½7 ½ inches by 10 ½ inches
98 ¾ inches by 11 ½ inches
9 ½9 inches by 12 inches
109.5 inches by 12.625 inches
1310 inches by 13 inches

Catalog

This envelope style is commonly used for mailing catalogues, magazines, and reports. Catalog envelopes are meant for containing documents without the need to fold them.

TypeSize
16 inches by 9 inches
1 ¾6 ½ inches by 9 ½ inches
26 ½ inches by 10 inches
37 inches by 10 inches
67 ½ inches by 10 ½ inches
78 inches by 11 ¼ inches
88 ¼ inches by 11 ¼ inches
9 ½8 ½ inches by 10 ½ inches
9 ¾8 ¾ inches by 11 ¼ inches
10 ½9 inches by 12 inches
12 ½9 ½ inches by 12 ½ inches
13 ½10 inches by 13 inches
14 ¼11 ¼ inches by 14 ¼ inches
14 ½11 ½ inches by 14 ½ inches

Policy Envelopes

Policy envelopes are primarily used to hold insurance policies, bonds, mortgages, and legal papers.

TypeSize
94 inches by 9 inches
104 1/8 inches by 9 ½ inches
114 ½ inches by 9 ½ inches
124 ¾ inches by 10 7/8 inches
145 inches by 11 ½ inches

Window Envelopes

Window envelopes are popularly used for marketing purposes. They are often used for bills too. One of the unique things that separate window envelopes from other envelopes are that the name and address shows through the window thereby eliminating the need to address the envelope. In most cases, a translucent plastic is used as the window material. In as much as most people prefer to use open window envelopes, they are, however, less secure compared to the other envelopes.

There are two types of open window envelopes; single window envelope and double window envelopes.

ISO envelope Standards

ISO envelopes are envelopes used all over the world. The C series was designed to house the ISO A paper sizes. For instance, a C5 envelope would house an A5 sheet flat, or an A4 folded once.

NameSizeContent format
C312 ¾ inches by 18 inchesA3 sheet
B49 7/8 inches by 13 7/8 inchesC4 envelopes          
C49 inches by 12 ¾ inchesA4 sheet
B57 inches by 9 7/8 inchesC5 envelope
C56 3/8 inches by 9 inchesA4 folded once
B65 inches by 7 inchesA4 folded in quarters
C64 ½ inches by 6 3/8 inchesA4 folded in quarters
DL4 ¼ inches by 8 ¾ inchesA4 sheet folded in thirds or an A5 sheet folded in half lengthwise
C6/C54 ½ inches by 9 inchesA4 sheet folded in thirds
C7/63 ¼ inches by 6 3/8 inchesA5 sheet folded in thirds
C73 ¼ inches by 4 ½ inchesA5 sheet folded in quarters

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    Frequently Asked Questions

    How can I determine the envelope size that I need?

    One of the ways that you can easily remember or determine the envelope size that you need is to swap the letter “A” letter of your paper size for letter “C.” for instance, if you need an envelope to fit an A4 sheet paper, then you simply swap the “A” and put the “C” and you have a “C4.” This is the size of the envelope you will need.

    What does the letter C mean?

    All papers come in A and B sizes. C envelope size is basically the geometric mean of sizes “A” and “B” of the same number. This calculation produces a size between the “A” and “B” dimensions to make a perfect envelope to hold the size “A” paper. For instance, if you calculate the geometric mean of an “A4” and a “B4” paper, you will get a C4 envelope, which is ideal for holding an A4 size paper without folding.

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