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What is A0 Poster Size?

Straight to the point, what is a A0 poster size?  841 × 1189 millimeters or 33.11 × 46.81 inches.

Part of the ISO 216 standard

A0 is part of a set or range of page sizes, called the ISO A or ISO 216 standard. This international standard is based on the German DIN 476 standard from 1922. A0 is actually often referred to as DIN A0. The Japanese have adopted the same range of paper sizes in their JIS P 0138-61 standard.

By folding an A0 in two along its shortest side, you create an A1 document. Fold once more and you get an A2 sized document. This way a range of poster sizes is created from A0 (which has a surface of one square meter) to A10. The height/width ratio remains constant for all sizes: 1:1.41 or the square root of 2. The dimensions always get rounded to the nearest millimeter.

Comparison of poster sizes from A0 to A4

Resolution we would print an A0 size picture

At 300 ppi (pixels per inch) the image needs to be 9933 x 14043 pixels. This is the required resolution for quality offset printing that will be viewed from a short distance (such as books, brochures, magazines, calenders,…). For photos it is also the optimum resolution but a somewhat lower pixel count (200 to 220 dpi) is acceptable for great looking photographs.

A digital camera with decent image quality and a resolution of 24 megapixel or more can be used to print high quality A0 size pictures. Since such posters are usually viewed from a larger distance a 20 megapixel camera will still offer excellent quality and 16 megapixels will be considered good by most people.

If you are interested in buying posters A4, A3, A2, A1 and A0, visit our poster printing page.

Anymore information or a quick quote, don’t hesitate go contact our team via 01708 200166 or email