Envelope formats. Standard envelope sizes What it looks like

19.10.2022

The dimensions of format C, created for envelopes, are predefined in ISO 269, and are also given in the table below, in millimeters and inches (convert to cm by dividing the mm value by 10). The diagram on the right shows the size of each envelope compared to a piece of A4 paper. In the US and North America, envelope sizes do not comply with ISO 216 as outlined on this page.

Envelope Size Chart C0 to C10

C Sheet Dimensions

Size	Height x Width (mm)	Height x Width (" inches)
C0	1297 x 917 mm	51.5 x 36.1" inches
C1	917 x 648 mm	36.1 x 25.5" inches
C2	648 x 458 mm	25.5 x 18.0" inches
C3	458 x 324 mm	18.0 x 12.8" inches
C4	324 x 229 mm	12.8 x 9.0" inches
C5	229 x 162 mm	9.0 x 6.4" inches
C6	162 x 114 mm	6.4 x 4.5" inches
C7	114 x 81 mm	4.5x. 3.2" inches
C8	81 x 57 mm	3.2 x 2.2" inches
C9	57 x 40 mm	2.2 x 1.6" inches
C10	40 x 28 mm	1.6 x 1.1" inches

An interesting fact is that the C sheet format was the most recently introduced, in 1995.

Series C Tolerances Envelope Sizes

± 1.5 mm (0.06 in) for sizes up to 150 mm (5.9 in)
±2 mm (0.08 in) for sizes ranging from 150 to 600 mm (5.9 to 23.6 in)
± 3 mm (0.12 in) for any dimension above 600 mm (23.6 in)

Format C sizing for envelopes

Format C of envelopes defines the values of sizes C (N) as the geometric mean between the sizes of formats A (N) and B (N), i.e. dimensions C4 are the geometric mean of A4 and B4. This results in dimensions that fall between the two formats, which, when the envelope is made to measure, will ideally accommodate paper of the same size. For example, a C4 size envelope is ideal for an unfolded A4 sheet of paper.

It should be noted that C format envelopes also have an aspect ratio equal to the square root of 2 and because of this, an A4 sheet folded parallel to its smaller side will easily fit into a C5 envelope, and when folded twice more it will fit into a C6 format envelope.

The following diagrams show how C4, C5 and C6 envelopes compare to a sheet of A4 paper (the envelope is shown in brown and the piece of paper is grey), as you can see in the first diagram a C4 envelope can fit an entire A4 sheet, a C5 envelope can hold an A4 sheet folded in half (A5 sheet) and a C6 envelope can hold an A4 sheet folded in half (A6 sheet). This is the reason why these envelopes are sometimes referred to as A4, A5 or A6 size envelopes.

Envelope format DL sizes for business correspondence

DL envelope format for business correspondence

One of the most widely used business envelopes is the DL format. It does not fall under C format sizes as it has different proportions than the series. This envelope first appeared in Germany in the 1920s and was known as DIN Lang, but DL is now more often deciphered as "Dimension Lengthwise". This value is defined in the ISO envelope standards as the standard for the most commonly used size of business envelopes.

The dimensions of the DL format are 110 x 220 mm (4⅓" x 8⅔") and as such the DL envelope contains a sheet of A4 paper folded into 3 equal parts parallel to its smaller side.

Despite complaints from automatic sealing machine manufacturers that this format is a little small for secure packaging and the introduction of C6/5 envelopes measuring 114 x 229mm, the original DL size continues to be the most commonly used.

C-size paper sizes for envelopes was last modified: March 10th, 2015 by admin

According to Wikipedia's definition, an envelope is a special shell for inserting, storing and sending papers or flat objects. The most popular are postal envelopes, which are used to send postal items. Postal envelopes differ from each other in a number of ways:

1. By format

2. By type of gluing

3. By paper type

4. At the location of the closing valve

5. By the presence of a window, etc.

In this article we will try to tell you what envelope formats there are and how they differ from each other. Envelope formats are based on paper standards. Envelopes are usually slightly larger than the inserts.

In Russia, the requirements for envelopes are determined GOST R 51506-99, which, in turn, takes into account the requirements of international standards. You can purchase such envelopes at any post office or make your own. The new one from AMS Software - "Mail Envelopes" - is ideal for these purposes. The product is simple and easy to use, supports various envelope formats, and also allows you to create custom-sized envelopes.

The following are distinguished: envelope formats:

1. C6("Soviet envelope") - an envelope the size 114x162 mm. Accommodates an A4 sheet folded in four or an A5 sheet folded in three. Suitable for sending receipts, letters, small cards.

2.DL(European standard E65) - envelope 110x220 mm. Holds A4 sheet folded in three. It is used both in business correspondence and for sending regular letters. These envelope formats (C6 and DL) are the most popular.

3. C5- envelope 162x229 mm. Used to send A5 or A4 sheets folded in half.

4. C65- envelope 114x229 mm. Accommodates an A5 sheet folded in half or an A4 sheet folded in three. It is mainly used when sending invitation cards, greeting cards, postcards.

5. C4- large envelope size 229x324. Accommodates A4 sheet unfolded. Ideal for sending contracts.

6. B4- large envelope 250x353 mm. Magazines, product catalogs, and quarterly calendars are usually sent in such envelopes. Holds up to 20 A4 sheets.

When sending documents or other paper attachments, the envelope performs a protective function. There are different types of these products, which differ in the following characteristics: type of paper, format, type of adhesive layer, valve shape, presence of a window.

Paper type

Typically, envelopes are made from paper with a density of 80 to 120 gsm. m. Standard products, which can be purchased at the post office, are made from 80 g/m² paper with a whiteness of 96%. When creating branded solutions, it is possible to use designer textured, colored or kraft paper, various design methods, including applying a logo based on a digital sketch. Such services allow you to highlight your message and attract the attention of the recipient.

Format

C4 - side size 229 x 324 mm, this envelope is suitable for A4 sheets, used for sending contracts and other official documents.
C5 - with sides 162 x 229 mm, it is perfect for A5 brochures and leaflets, you can send A4 sheets folded in half.
C6 - 114 x 162 mm, for postcards, small correspondence, A4 sheets folded four times.
DL (E65) - dimensions 110 x 220 mm allow you to accommodate a landscape sheet folded in three, used for direct mailings and business correspondence.

Type of adhesive layer

In modern printing houses in Moscow you can purchase products with a self-adhesive or wettable layer. The seal uses dextrin, a glue made from potato or corn starch that becomes sticky when exposed to moisture.

Valve shape

This part is necessary for secure packaging of the contents. Its shape can be any, especially if your company orders exclusive products, but the most common ones are rectangular.

Presence of a window

You can order envelopes with a vertical or horizontal window on the front. The hole, covered with a transparent film, allows you to partially see the contents, for example, an address.

Advantages of purchasing DL Euro envelopes from us

At PackPost you can find all types of E65 envelopes:

white and colored;
with and without an address window. The transparent window can be located on the right or left, it is designed to view the recipient's name and delivery address printed on the paper inserted inside;
with address zone and indicators “To”, “Where”, “Sender’s Address” and “Recipient’s Address”;
with different gluing methods- with an adhesive layer of dextrin or tear-off tape. The dextrin layer requires wetting with water, but such products are cheaper and suitable for use in envelope machines, which makes them convenient for sending large quantities. E65 envelopes with silicone tape (strip) are more convenient to use for manual packaging and in case of small runs;
with different valve shapes. The valve can be rectangular or triangular (suitable for gluing in envelope machines);
with internal printing, which prevents the envelope from showing through;
envelopes for airmail with appropriate symbols.

In our assortment you can find any type of E65 format envelopes that will help reduce the time spent on sending correspondence.

Extensive experience, high-quality printing and low prices are what make us a leader in the market. Our customers can always count on a large selection of products and an individual approach.

What does it look like?

Despite the fact that there are some standard sizes of envelopes and packages, clients of the Printing-House printing house can always contact the company’s managers and discuss with them any individual shapes, sizes and designs of these types of printed products.

C4 size envelope

The flap of a C4 format envelope can be located on both the long and short sides. Sometimes this envelope is called a package.

Ordinary people often do not very accurately call a C4 format envelope an “A4 envelope”, since it can accommodate an entire A4 sheet.

The C4 format corresponds to the size of 229 mm x 324 mm;
Most often, documents or magazines in A4 format are sent in a C4 envelope, since it allows you to send documentation and publications of this size without folding.

C5 size envelope

Envelope of C5 format – “Double Russian”, because 2 times larger than the “Russian” C6 format envelope. Sometimes a C5 envelope is not quite correctly called an A5 envelope.

The C5 format measures 162mm x 229mm;
It can accommodate either an A4 sheet folded in half or an entire A5 sheet.

C6 size envelope

Envelope in C6 format – “Russian”.

The C6 format corresponds to the size of 114 mm x 162 mm;
Typically, an A4 sheet folded 4 times is placed in such an envelope.

A C6 format envelope is often also called a “Soviet” envelope. This is one of the formats of postal envelopes that can accommodate a standard, non-extended postcard.

E65 envelope

An E65 format envelope is an elongated envelope, the so-called “Eurostandard” (“Euro” or Euro-format envelope).

The E65 format corresponds to the size 110 mm x220 mm;
As a rule, a sheet of A4 size paper folded three times is placed in an E65 format envelope.

E65 is one of the formats of postal envelopes.

K6 size envelopes

K6 format envelopes - for CDs.
The K6 format corresponds to the size 125 mm x 125 mm.

K7 and K8 format envelopes

K7 and K8 format envelopes - for greeting cards.

The K7 format corresponds to the size of 90 mm x 140 mm;
The K8 format corresponds to the size 150 mm x 150 mm.