What Size Is a4 Envelope?

A4 envelopes are the most common size envelopes. The dimensions of a4 envelope are 220mm x 297mm.

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Standard A4 Envelope Size

An A4 envelope is a standard size envelope that is commonly used for sending documents and other flat items. The dimensions of a4 envelope are 210mm x 297mm.


An A4 envelope is a standard-sized envelope designed to hold an A4 sheet of paper flat. The envelope should measure about 8.3 by 11.7 inches (210 by 297 mm). There are a few ways to measure an envelope, but the most important thing to remember is that the width must always be the shorter dimension.


A4 envelopes have a standard size of 9-5/8 inches by 4-1/8 inches. This gives them a capacity of approximately three fourths of an inch, which is enough to hold around 80 pages worth of paper without bending or creasing them. The A4 envelope is a popular choice for mailing documents and other flat items that need to be protected during transit.

How to Measure an A4 Envelope

An A4 envelope is a standard sized envelope that is often used for sending letters and other documents through the mail. This size envelope is also a popular choice for invitations and other formal correspondence. Measuring an A4 envelope is easy to do and only requires a few materials.


To measure the length of an A4 envelope, lay the envelope flat on a surface and measure from the bottom left corner to the top right corner of the envelope. The measurement should be 210 millimeters (mm).


The width of an A4 envelope is equal to the short side of an A4 sheet of paper. This means that it will measure 210mm (8.27 inches) wide.

A4 Envelope Size vs. Letter Size

The standard envelope size is the #10 envelope, which measures 4 1/8 inches by 9 1/2 inches. But what if you’re using a different size paper? Is there a standard envelope size that will fit all types of paper? The answer is yes, and it’s the A4 envelope.

Envelope Size

An A4 envelope is slightly larger than a standard letter size envelope. It is typically used for business correspondence or for sending documents that are too large to fit in a standard envelope. The dimensions of an A4 envelope are 210mm x 297mm.

Letter Size

Technically, A4 is a little longer and a little wider than US Letter size. However, since both are proportions of the international standard paper size known as ISO 216, the difference is only about 2 mm in each dimension. This means that an A4 envelope will usually fit into a US Letter-size mailbox with no problem.