A4 paper size is 8.27 inches by 11.69 inches. This is the standard size used in most of the world, outside of the United States and Canada, where the Letter size (8.5 inches by 11 inches) is more commonly used.

Paper Size Type | Paper Width | Paper Height |

A4 Dimensions | 8.267 Inches | 11.692 Inches |

Letter Dimensions | 8.5 Inches | 11 Inches |

Letter size: Canada and the United States of America.

A4 size in mm: United Kingdom, Australia, Germany, Singapore, India, United Arab Emirates, Philippines, New Zealand and nearly ever other country in the world.

MM | Inches | CM | Pixels |

## A4 Paper Size in Inches: Details Guide

The A series of paper sizes is an international standard, used in almost every country in the world except for the US and Canada. The A series was adopted as an international standard to create a uniform system of paper sizes ranging from A0 (the largest) to A10 (the smallest).

The A0 size is defined as having an area of one square meter, with a dimension ratio of 1: √2. Each subsequent size (A1, A2, A3, etc.) is half the size of the previous one when cut parallel to its shorter side. Therefore, an A4 sheet is half the size of an A3 sheet, and so on.

This standardization ensures that the aspect ratio is maintained when changing sizes, which is especially important in printing, as it ensures that the content will not be distorted when resized.

As mentioned earlier, the A4 paper size is 8.27 inches by 11.69 inches (or 210mm by 297mm). It’s widely used for letters, documents, magazines, and catalogs.

In contrast, the United States and Canada primarily use a different system, known as the ‘letter’ system. The standard paper size in this system, known as ‘Letter,’ measures 8.5 by 11 inches. Other sizes in this system include ‘Legal’ (8.5 inches by 14 inches) and ‘Tabloid’ (11 inches by 17 inches). This system is based on a traditional British system that was in use before the international A series was developed.

## All A Paper Sizes

Paper Size | Dimensions in Millimeters (mm) | Dimensions in Inches (“”) |
---|---|---|

A0 | 841 x 1189 | 33.1 x 46.8 |

A1 | 594 x 841 | 23.4 x 33.1 |

A2 | 420 x 594 | 16.5 x 23.4 |

A3 | 297 x 420 | 11.7 x 16.5 |

A4 | 210 x 297 | 8.3 x 11.7 |

A5 | 148 x 210 | 5.8 x 8.3 |

A6 | 105 x 148 | 4.1 x 5.8 |

A7 | 74 x 105 | 2.9 x 4.1 |

A8 | 52 x 74 | 2.0 x 2.9 |

A9 | 37 x 52 | 1.5 x 2.0 |

A10 | 26 x 37 | 1.0 x 1.5 |

Note: The size for each A number is determined by halving the size of the previous number along its largest dimension. For example, A4 is half the size of A3, A5 is half the size of A4, and so on.

**A4 paper dimensions**

The dimensions of A4 paper are 210 millimeters by 297 millimeters, or about 8.27 inches by 11.69 inches. This size is widely used across the world, except in North America where the Letter size (8.5 inches by 11 inches) is more common.

Paper Size | Dimensions in Millimeters (mm) | Dimensions in Centimeters (cm) | Dimensions in Inches (“”) |
---|---|---|---|

A0 | 841 x 1189 | 84.1 x 118.9 | 33.1 x 46.8 |

A1 | 594 x 841 | 59.4 x 84.1 | 23.4 x 33.1 |

A2 | 420 x 594 | 42.0 x 59.4 | 16.5 x 23.4 |

A3 | 297 x 420 | 29.7 x 42.0 | 11.7 x 16.5 |

A4 | 210 x 297 | 21.0 x 29.7 | 8.3 x 11.7 |

A5 | 148 x 210 | 14.8 x 21.0 | 5.8 x 8.3 |

A6 | 105 x 148 | 10.5 x 14.8 | 4.1 x 5.8 |

A7 | 74 x 105 | 7.4 x 10.5 | 2.9 x 4.1 |

A8 | 52 x 74 | 5.2 x 7.4 | 2.0 x 2.9 |

A9 | 37 x 52 | 3.7 x 5.2 | 1.5 x 2.0 |

A10 | 26 x 37 | 2.6 x 3.7 | 1.0 x 1.5 |

Note: The size for each A number is determined by halving the size of the previous number along its largest dimension. For example, A4 is half the size of A3, A5 is half the size of A4, and so on.

## Why use A4 size paper?

A4 paper size is a globally recognized standard size, especially outside North America. Here are some reasons why A4 paper size is commonly used:

**Standardization**: The A-series paper sizes, including A4, are standardized by the International Standards Organization (ISO). This makes it convenient for manufacturers and users worldwide as they can be assured that A4 paper purchased anywhere will always have the same dimensions.**Aspect Ratio**: The aspect ratio of A4 paper is 1:√2 (approx. 1:1.41), which has a unique property: when you fold the paper in half widthwise, you get two pieces of A5 paper that have the same aspect ratio as the A4 paper. This is convenient for scaling pages up or down in size.**Versatility**: The A4 size is an excellent middle ground for practicality and usability. It’s not too big and not too small – great for letters, forms, printing documents, manuals, and more. It’s large enough to contain a good amount of information, but small enough to be easily stored, transported, and handled.**Printer Compatibility**: Most printers are designed to easily accommodate A4 paper, among other sizes. This ensures that when printing, whether at home, in an office, or at a professional print shop, the process is straightforward and compatible with the equipment.**Availability**: Because of its standardization and widespread use, A4 paper is readily available in most countries, making it a convenient choice for users.

Note: While A4 is the global standard, North America primarily uses a different system known as the U.S. Letter system, where the standard size is “Letter” (8.5 inches x 11 inches, or about 215.9 mm x 279.4 mm).

## What are Inches?

An Inch is known plurally as Inches. An Inch was based on 3 Barelycorns side by side in length and was introduced in England in the 1300s.

One inch is equivalent to 2.54 centimetres, or 25.4 millimetres.

There are 12 inches in one foot and 39 inches in one metre.

Inches are mostly used to measure medium distances, and are part of the Imperial measurement system.