Paper sizes in series A

The A series of paper is the most commonly used worldwide, with only the US and Canada (some parts of Mexico) not currently conforming to the ISO 216 (international standard).

Paper sizes in millimeters and inches

Paper sizes and dimensions refer to the physical size and measurements of a sheet of paper. They are standardized by organizations such as ISO (International Organization for Standardization) and ANSI (American National Standards Institute) to ensure consistent and uniform sizes for different types of paper, such as letter, legal, and A4. The dimensions are usually specified in millimeters or inches, and include the length and width of the paper.

The most commonly used paper sizes are Letter (8.5 x 11 inches), A4 (210 x 297 mm), and Legal (8.5 x 14 inches).

Paper sizes are standardized formats that are used for writing, printing and design. They are defined by the International Organization for Standardization (ISO) and are based on the metric system.

About the ISO standard

The International Organization for Standardization (ISO) first published its international standard for paper sizes in 1975, although the format itself is based on the German DIN 476 standard that was first introduced in 1922. The ISO standard for paper sizes is known as ISO 216 and it defines a series of paper sizes based on a single aspect ratio of the square root of two (1:√2). This aspect ratio means that the ratio of the length to the width of each paper size is the same, and each size is simply half the area of the next larger size.

Other paper sizes (US)

Click if you are looking for measurements and information about B size papers or paper sizes in the US standards (used in Canada and Mexico also).