Image: Wikimedia Commons

A4

Paper format

Also known as A4 format · A4 paper format · A4 paper

Instance of: paper size
Part of: A series
Founded: 1922

Overview

From Wikipedia, the free encyclopedia · Read full article · Text CC BY-SA 4.0

ISO 216 is an international standard for paper sizes, used around the world except in North America, the Philippines and parts of Latin America. The standard defines the "A", "B" and "C" series of paper sizes, which includes A4, the most commonly available paper size worldwide. Two supplementary standards, ISO 217 and ISO 269, define related paper sizes.

Overview

All data

19 statements · 11% with external sources · numbers in brackets are citations

Width: 210 mm
1
Sources
1.papersizes.org/a-paper-sizes.htm
View statement on Wikidata ↗
Height: 297 mm
1
Sources
1.papersizes.org/a-paper-sizes.htm
View statement on Wikidata ↗
Different from: A4 criterion used: descriptive page and disambiguation page have to be in different items
octavo
Discovered by: Walter Porstmann
Uses: square root of 2

On other databases

11 identifiers linking A4 across the web's reference databases

Data quality

statements

11%

externally sourced

Source last edited May 17, 2026. AIDB refreshes this page daily.

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AIDB. (2026). A4 (Q280184). Retrieved from https://aidb.si/e/a4-Q280184