The A series is comman and world wide used paper size. The base A0 size of paper is defined as having an area of 1 m2 and a dimension ratio of 1 to √2. Successive paper sizes in the series A1, A2, A3, and so forth, are defined by halving the preceding paper size across the larger dimension.

The A Series paper size chart, below left, gives a visual representation of how the sizes relate to each other - for example A5 is half of A4 size paper and A2 is half of A1 size paper.

Paper size refers to standardized dimensions for sheets of paper used globally in stationery, printing, and technical drawing. Most countries adhere to the ISO 216 standard, which includes the widely recognized A series (including A4 paper), defined by a consistent aspect ratio of √2.

Aug 11, 2021 · The A-series consists of a logical set of paper sizes that are defined by the ISO 216 standard. The largest size measures one square meter. The height/width ratio remains constant (1:1.41) for all sizes. This means you get the A1 size by folding an A0 paper in two along its shortest side.

Mar 11, 2025 · If you're not sure what the difference is between A4 and Letter size paper, or how big an A5 or B5 notebook is, start here. We explain how international paper sizes work and compare common A and B Series paper sizes to Letter size.

A Paper Sizes in Points, Pica and HPGL Units. This table gives width x height for A series paper sizes in typography and plotter units; pica, point and HPGL units in portrait orientation.

ISO standard A paper size chart including A0, A1, A2, A3, A4, A5, A6, A7, A8, A9 and A10. Dimensions in inches, cm, mm, and pixels in different ppi/dpi.

A0 is defined as having an area of 1 square metre, however the A paper size standard also specifies that each size is rounded to the nearest millimetre. Thus A0 is 841mm x 1189mm giving an area of 0.999949 square metres.

Paper Size Chart. In order to visualise the different A-Series paper sizes, try to compare each one in relation to the paper size that is one grade larger. Each paper size is a perfect half of the larger size. Folding an A0 size creates an A1 size, folding an A1 size creates an A2 size, and so on.

Check out our A-series paper sizes chart comparing millimeter, centimeters, and inches.