Paper A Sizes Explained

A size paper is a standard system used for paper sizes around the world. The most common size is called A4, which is often used for printing documents. It measures about 8.3 inches by 11.7 inches (or 21 cm by 29.7 cm).

The A size paper series is based on a simple rule: each size is half the area of the previous one. So, if you fold an A4 sheet in half, you get two A5 sheets, and if you fold an A3 sheet in half, you get two A4 sheets.

This standard makes it easy to scale up or down between paper sizes while keeping the same proportions. It helps people and businesses handle documents consistently, no matter where they are in the world.

Envelope C Sizes Explained

C size paper is another standard series of paper sizes, also based on the ISO 216 international standard. The C size series is mainly used for envelopes and is designed to perfectly fit the corresponding A size paper.

The most common size in the C series is C4, which fits an unfolded A4 sheet. When you fold an A4 sheet in half and put it in a C5 envelope, it fits nicely. Similarly, if you fold an A4 sheet twice and put it in a C6 envelope, it fits snugly.

The C size paper series maintains the same aspect ratio as the A size series, making it easy to pair A and C sizes together. This consistency ensures that documents printed on A size paper can be conveniently placed into the corresponding C size envelopes without the need for resizing.

In summary, C size paper is a set of standard envelope sizes designed to match perfectly with the A size paper series, providing a convenient and consistent way to package and send documents.