Welcome to A4 Paper Size

www.A4PaperSize.org provide measurements and dimensions of current A4 paper measurements in countries such as the UK, Australia, India, Singapore, Germany, Europe and the USA.

We strive to keep our visitors up to date with the latest dimensions of A4 size paper. www.A4PaperSize.org shows the A4 sheet dimensions in centimetres, inches, millimetres and pixels for Photoshop.

To get started in finding the A4 paper dimensions you're looking for, click one of the four options listed below. Visit our articles page to learn How Paper is Made and The History of Paper.

A4 Size in




Letter Size Paper Vs A4 Size Paper

Letter size paper remains in North American countries, where most of the world uses A4 paper dimensions. The size of A4 sheet is half the size of an A3 sheet, and twice the dimensions of A5 sheet. The dimensions of Letter on the other hand, doesn't have any mathematics dimensions that can be compared to different size imperial paper easily.

Metric A4 Size:

  • 210 x 297 millimetres
  • 21 x 29.7 centimetres
  • 0.21 x 0.297 metres

Imperial A4 Size:

  • 8.267 x 11.692 inches
  • 0.688 x 0.974 feet
  • 0.229 x 0.324 yards

Metric Letter Dimensions:

  • 215.9 x 279.4 millimetres
  • 21.59 x 27.94 centimetres
  • 0.216 x 0.2794 metres

Imperial Letter Dimensions:

  • 8.5 x 11 inches
  • 0.708 x 0.916 feet
  • 0.236 x 0.305 yards


When Did A4 Size Become A Standard - ISO 216

A4 paper became a standard in the late 1970's. However, even though the ISO 216 standards were introduced in the early 20th century, it took more than 50 years for these paper dimensions to be recognised world wide. The standard is now used in the UK, India, Singapore, Germany, Europe, Japan and most other countries.

Which Countries Use A4 Paper

Today, A4 is used by most countries around the world. With the exception of the USA and Canada. Many South American countries such as Mexico, Costa Rica, Chile, Venezuela and more, have officially taken on the A4 sheet dimensions standard. However, the most common page size in these countries is still 'Letter Size', along with other imperial page sizes.

When To Use A4 Size

A4 size is the most common paper standard in the world. It it used for everyday tasks like to-do lists, printing information from a computer, schedules and many other daily tasks. The A4's size allows you to fit it inside a C4 envelope.

Who Invented Paper Standards

In the 1920's, Dr Porstmann of Germany published a document proposing a standard for sheet dimensions that would later change the world. Dr Porstmann's theory quickly became DIN approved, which is a standard in Germany meaning 'Deutsches Institut for Normung'. In English, DIN translates as 'German Institute for Standardisation'. A4 size is now under the international standard of ISO 216.

Why Standard Paper Dimensions Were Invented

Paper standards were introduced to make life easier for publishers in the 1700's. Different sizes mean different size envelopes, different letter boxes and unbalanced sheet stacks. If paper was never standardised today, it would be a lot more expensive. We would need different dimension fax machines, printers, in and out trays, etc.

View the dimensions of A4 paper in millimetres for the UK, USA, Australia, Europe, Japan. Comparing the size of A4 paper to Letter size and what a Millimeter is....

View the dimensions of A4 paper in pixels at different types PPI and DPI. Including Letter size and A4 paper for use in Photoshop at different dots/pixels per inch...

A4 paper dimensions in inches, centimetres, millimetres and pixels. A4 paper sizes CM, MM, Px and In for India, UK, USA and Europe...

Read this compressed version of how paper is made by www.A4PaperSize.org. Learn how paper goes from being a tree, to being a useful tool around the world...