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International Envelope Series



Belonging to the ISO 216 series, the C7/C6 paper size is a unique and versatile format. This specific size, measuring 81mm by 114mm, is designed to accommodate an A6 sheet when folded in half. It's a perfect fit for an A6 document or card, providing ample space without any need for trimming or adjustments.

The C7/C6 paper size is part of the larger C-series within the ISO 216 standard. This series was specifically created for envelopes and is defined in an ingenious way: each envelope size in the series is designed to enclose the equivalent A-series paper when folded in half.

C7/C6 paper dimensions


View All International Envelope Series

2A046.81 x 66.221189 x 1682119 x 1683370 x 4768
A120.51 x 0.7113 x 181 x 237 x 51
4A066.22 x 93.621682 x 2378168 x 2384768 x 6741
A110.71 x 1.0218 x 262 x 351 x 74
A101.02 x 1.4626 x 373 x 474 x 105
A3+12.95 x 19.02329 x 48333 x 48933 x 1369
A1+23.98 x 35.98609 x 91461 x 911726 x 2591
A0+35.98 x 50.87914 x 129291 x 1292591 x 3662
A64.13 x 5.83105 x 14811 x 15298 x 420
A55.83 x 8.27148 x 21015 x 21420 x 595
A48.27 x 11.69210 x 29721 x 30595 x 842
A311.69 x 16.54297 x 42030 x 42842 x 1191
A91.46 x 2.0537 x 524 x 5105 x 147
A216.54 x 23.39420 x 59442 x 591191 x 1684
A82.05 x 2.9152 x 745 x 7147 x 210
A123.39 x 33.11594 x 84159 x 841684 x 2384
A72.91 x 4.1374 x 1057 x 11210 x 298
A033.11 x 46.81841 x 118984 x 1192384 x 3370

Interestingly, while most countries adhere to this ISO standard, it's not universally accepted. The United States and Canada primarily use a different system known as ANSI/ASME Y14.1 which includes sizes such as 'Letter', 'Legal' and 'Tabloid'. However, even within these regions, you'll find instances where ISO sizes like C7/C6 are used due to their practicality and versatility.

Whether you're sending out invitations or crafting personalized greeting cards, understanding paper sizes like C7/C6 can make your task easier and more efficient. It's just one example of how international standards can simplify our everyday tasks.

Other Formats in the International Envelope Series

Interesting facts about C7/C6

1: C7/C6 Paper Size

C7/C6 paper is a specific size within the ISO 216 standard for paper sizes. It measures 81 mm x 114 mm, which is slightly larger than a credit card.

2: Envelope Compatibility

C7/C6 paper is commonly used for envelopes that can hold A7-sized cards or documents. Its compact size makes it ideal for invitations, thank-you notes, and small correspondence.

3: International Usage

The C7/C6 size is part of the international standard series of paper sizes developed by the International Organization for Standardization (ISO). It is widely recognized and used in many countries around the world.

4: Historical Origins

The ISO paper size system originated from a German standard called DIN (Deutsche Industrie Norm). The DIN standard was first introduced in Germany in 1922 and later adopted as an international standard in the form of ISO 216.

5: Proportional Ratios

The C7/C6 size maintains the same aspect ratio as other ISO paper sizes. This means that if you fold a sheet of A7-sized paper in half, it will fit perfectly into a C7 envelope, which can then be inserted into a C6 envelope without any excess space.

6: Common Uses

C7/C6 envelopes are often used for personal or business correspondence that requires a small but elegant presentation. They are popular choices for wedding invitations, RSVP cards, gift cards, and intimate events where attention to detail matters.

7: Specialty Printing Options

C7/C6 paper can be printed using various techniques, including offset printing, digital printing, and letterpress. Its small size allows for intricate designs and customization options to create unique and eye-catching stationery.

8: Paper Weight Variations

C7/C6 paper is available in different weights, typically ranging from 80 gsm (grams per square meter) to 120 gsm. The weight of the paper affects its thickness and durability, allowing for different levels of sturdiness depending on the intended use.

9: Environmental Considerations

When choosing C7/C6 paper or envelopes, it is important to consider eco-friendly options. Look for products made from recycled materials or those certified by sustainable forestry organizations to minimize environmental impact.

10: Creative Possibilities

C7/C6 paper's compact size opens up creative opportunities for artists and crafters. It can be used as a canvas for miniature paintings, origami projects, collage art, or even as a base for handmade jewelry.