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.
| Size | Height x Width (mm) | Height x Width (inch) |
|---|---|---|
| 4A0 | 2378 x 1682 mm | 93.6 x 66.2 in |
| 2A0 | 1682 x 1189 mm | 66.2 x 46.8 in |
| A0 | 1189 x 841 mm | 46.8 x 33.1 in |
| A1 | 841 x 594 mm | 33.1 x 23.4 in |
| A2 | 594 x 420 mm | 23.4 x 16.5 in |
| A3 | 420 x 297 mm | 16.5 x 11.7 in |
| A4 | 297 x 210 mm | 11.7 x 8.3 in |
| A5 | 210 x 148 mm | 8.3 x 5.8 in |
| A6 | 148 x 105 mm | 5.8 x 4.1 in |
| A7 | 105 x 74 mm | 4.1 x. 2.9 in |
| A8 | 74 x 52 mm | 2.9 x 2.0 in |
| A9 | 52 x 37 mm | 2.0 x 1.5 in |
| A10 | 37 x 26 mm | 1.5 x 1.0 in |
‘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.
Standard sizes of envelopes
The sizes of envelopes are also internationally defined. The table below depicts all the common envelope sizes.
| Size | Height x Width (mm) | Height x Width (inch) | Suitable Paper Formats |
|---|---|---|---|
| C4 | 324 x 229 mm | 12 – 3/4 x 9 in | A4 or A3 folded once |
| C5 | 162 x 229 mm | 6 – 3/8 x 9 in | A5, A4 folded once, or A3 folded twice |
| C6 | 114 x 162 mm | 4 – 1/2 x 6 – 3/8 in | A6, A5 folded once, or A4 folded twice |
| C7/6 | 89 x 165 mm | 3 – 1/2 x 6 – 1/2 in | 1/3 A4 |
| DL | 110 x 220 mm | 4 – 1/4 x 8 – 5/8 in | A5 folded once or A4 folded twice |
Example of envelope size:
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