The dimensions of the ‘A’ paper sizes are defined by the ISO 216 standard. The ‘A’ series of paper sizes are for the most part used worldwide. It consists of 13 different paper sizes.

This ‘A’ series paper size ISO 216 standard is based on each size being half the size of the previous size when it is folded parallel to the shorter lengths. The aspect ratio stays constant which is incredibly useful when enlarging or reducing images. So for example: an A4 is 297 x 210 mm, and an A3 is 420 x 297, you see how 210 is multiplied by 2 and the length of the A4 becomes the width of the A3.

What are the standard ‘A’ paper sizes?

In the table below you see all 13 familiar ‘A’ paper sizes in mm and inches.

SizeHeight x Width (mm)Height x Width (inch)
4A02378 x 1682 mm93.6 x 66.2 in
2A01682 x 1189 mm66.2 x 46.8 in
A01189 x 841 mm46.8 x 33.1 in
A1841 x 594 mm33.1 x 23.4 in
A2594 x 420 mm23.4 x 16.5 in
A3420 x 297 mm16.5 x 11.7 in
A4297 x 210 mm11.7 x 8.3 in
A5210 x 148 mm8.3 x 5.8 in
A6148 x 105 mm5.8 x 4.1 in
A7105 x 74 mm4.1 x. 2.9 in
A874 x 52 mm2.9 x 2.0 in
A952 x 37 mm2.0 x 1.5 in
A1037 x 26 mm1.5 x 1.0 in
A paper sizes
'A' Paper Sizes 4

‘A’ Paper Sizes Cheat Sheet

We have created this cheat sheet to make it easy to see the dimensions of all the ‘A’ paper sizes.

A paper sizes cheat sheet with measures
'A' Paper Sizes 5

Standard sizes of envelopes

The sizes of envelopes are also internationally defined. The table below depicts all the common envelope sizes.

SizeHeight x Width (mm)Height x Width (inch)Suitable Paper Formats
C4324 x 229 mm12 – 3/4 x 9 inA4 or A3 folded once
C5162 x 229 mm6 – 3/8 x 9 inA5, A4 folded once, or A3 folded twice
C6114 x 162 mm4 – 1/2 x 6 – 3/8 inA6, A5 folded once, or A4 folded twice
C7/689 x 165 mm3 – 1/2 x 6 – 1/2 in1/3 A4
DL110 x 220 mm4 – 1/4 x 8 – 5/8 inA5 folded once or A4 folded twice

Example of envelope size:

international envelope sizes
'A' Paper Sizes 6

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