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Envelope Sizes

Envelope Sizes

When ordering envelopes for the first time it can be a real head ache as a simple order turns into a complex mathematics encounter. Hopefully with this guide we can help you understand the envelope sizing system and also help you to work out exactly what envelope sizes you need. If you need any assistance please do not hesitate to contact us.

The most common envelope sizes used for business mailings are the C4, C5, C6 and DL sizes.

Envelope Size - C4

The C4 envelope size can hold an unfolded A4 sheet of paper.


Envelope Size - C5

The C5 envelope size can hold a single folded A4 sheet of paper or an unfolded A5 piece of paper.

C5 Envelopes

Envelope Size - C6

The C6 envelope size can hold an A4 sheet of paper that bas been folded into quarters, or an A5 piece of paper folded in half. And an unfolded A6 piece of paper

C6 Envelopes

Envelope Size - DL

The DL Envelope size can hold a A4 Piece of paper that has been folded into thirds, an A5 piece folded once, this envelope is most common in business

Envelope C Series

The C series of envelopes range from C0 all the way to C10, the most commonly used is the C4 and works in a similar fashion to how the A ISO paper series also works. C4 is smaller than C3 which is smaller than C2 etc. Below is a table that shows the dimensions of the C series of envelopes