Paper Sizes

Paper size is a dimension or the length and width of a paper that can be determined in unit of measurements such as mm (millimeter), cm (centimeter) or inch (inches). It is a definite size of a value, defined and adopted by convention that is used as a standard for measurement of the same kind of value. Any other size of that kind can be expressed as a multiple of the unit of measurement. There are many other paper size standards conventions have existed at different times and in different countries worldwide. It is affect or usually used for writing paper, tools, card, photography, printing, architectural and the size that related to the envelope.

paper sizes, paper, size, series, standard size, mm, cm, inch

Image: Paper Size

List of Contents:

Standard Paper Sizes

ISO (International Organization for Standardization) specifies international standard paper sizes used in most countries in the world today, although not in Canada, US, Mexico, Colombia, Dominican Republic, or some other countries. For example is ISO-216, The standard defines the "A" and "B" series of paper sizes, including A4 size, the most commonly available paper size worldwide. Two supplementary standards, ISO-217 and ISO-269, define related paper sizes, and the ISO-269 specifies "C" series which commonly listed alongside the A and B series.

All ISO-216, ISO-217 and ISO-269 paper sizes (except some envelopes) have the same aspect ratio, within rounding to millimeters. This ratio has the unique property that when cut or folded in half widthways, the halves also have the same aspect ratio. Each ISO paper size is one half of the area of the next larger size in the same series.

The A Series Paper Sizes

The A Series Paper Sizes being a standard that is often used according to ISO and it is widely applicable internationally, including A0, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10.

The B Series Paper Sizes

The B Series Paper Sizes is defined in the standard as a subsidiary series of sizes that obtained by placing the geometrical means between adjacent sizes of the A series in sequence. The use of the geometric mean makes each step in size that includes B0, B1, B2, B3, B4, B5, B6, B7, B8, B9, B10.

The C Series Paper Sizes

The C Series Paper Sizes is the geometric mean of the areas of the A and B series sheets of the same number. For instance, the area of a C3 sheet is the geometric mean of the areas of an A3 sheet and a B3 sheet. This series are includes C0, C1, C2, C3, C4, C5, C6, C7, C8, C9, C10.

The R Series Photo Sizes

Photo Sizes or Photo Print Sizes or The R Photo Sizes are commonly used for photo types of paper or photography to print photo and various other sizes such as postcard, and passport. This Series are includes 2R, 3R, 4R, 5R, 6R, 8R, 10R, 11R, 12R, 14R, 16R, 20R, 22R, 24R, 30R.

American Paper Sizes

The United States and Canada primarily use a different system of paper sizes compared to the rest of the world. US paper sizes are currently standard in the United States and are the most commonly used formats. Letter, Legal and Ledger/Tabloid are by far the most commonly used of these for everyday activities, and the only ones included in Cascading Style Sheets (CSS).

Related Sizes:

Unit of Measurements

mm (millimeter)

mm stands for millimeter (American spelling) or millimetre (SI spelling) is the size of the unit of length in the metric system, that is the basis of the length measurement. 1 mm is equal to 0.1 cm.

cm (centimeter)

cm stand for centimetre (international spelling as used by the International Bureau of Weights and Measures) or centimeter (American spelling) is a unit of length in the metric system, equal to one hundredth of a meter. cm being the International System of Units prefix for a factor of one per a hundred. cm is the base unit of length for cgs (centimetre–gram–second) system of units.


Inch (plural: inches, abbreviation: in or ″) is a unit of length in the imperial and United States customary systems of measurement, now formally equal to one per thirty six yard but usually understood as one per twelve of a foot. Derived from the Roman uncia, “inch” is also sometimes used to translate related units in other measurement systems. Traditional standards for the exact length of an inch have varied in the past, but since the adoption of the international yard during the 1950s and 1960s it has been based on the metric system and reckoned as exactly 2.54 cm.