A Series

Use this handy dimensions guide to know your way around A series paper sizes and their usage.

Size Dimension (inch) Dimension (mm)
A0 33.11 x 46.81 in 841 x 1189 mm
A1 23.39 x 33.11 in 594 x 841 mm
A2 16.54 x 23.39 in 420 x 594 mm
A3 11.69 x 16.54 in 297 x 420 mm
A4 8.27 x 11.69 in 210 x 297 mm
A5 5.83 x 8.27 in 148 x 210 mm
A6 4.13 x 5.83 in 105 x 148 mm
A7 2.91 x 4.13 in 74 x 105 mm
A8 2.05 x 2.91 in 52 x 74 mm
A9 1.46 x 2.05 in 37 x 52 mm
A10 1.02 x 1.46 in 26 x 37 mm

The A series papers are most commonly used for paperwork, business publications, as well as for communications and promotional materials. It comprises a logical set of paper sizes defined in the ISO 216 International Standard. In fact, you may have used an A series size paper so many times without realizing it.

A4 sized paper is deemed as one of the most common layout used worldwide, except in the United States, Canada and Mexico.

A0, the largest in this series, measures 84.1 x 118.9 cm. The succeeding sizes A1 to A10 are based on each size being half the size of the previous one, when folded. This also means that the length of one size is equal to the width of the size bigger to it. The quotient of the length divided by the width is 1.4142, and the series’ aspect ratio is 1:?2.

This size format offers useful applications such as enlarging and reducing images without any cutoff or margins. It can also be used to make a booklet by folding sheets in half.