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 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. The most commonly used paper sizes are:
- A4: 210 x 297 mm (8.27 x 11.69 inches)
- A3: 297 x 420 mm (11.69 x 16.54 inches)
- A5: 148 x 210 mm (5.83 x 8.27 inches)
- A6: 105 x 148 mm (4.13 x 5.83 inches)
These are the most commonly used paper sizes, there are other formats as well like:
- C series, D series, E series, F series, G series, etc.
- The A3 paper size is 297 mm x 420 mm or 11.7 x 16.5 in. A3 in pixels?
- The A4 paper size is 210 mm x 297 mm or 8.3 x 11.7 in. A4 in pixels?
- The A5 paper size is 148 mm x 210 mm or 5.8 x 8.3 in. A5 in pixels?
All paper sizes in millimeters and inches
Read more about the different A papers:
- Size of A0
- Size of A1
- Size of A2
- Size of A3
- Size of A4 (the most common paper size)
- Size of A5
- Size ofA6
- Size of A7
- Size of A8
- Size of A9
- Size of A10
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.