A Series
Core international document and marketing sizes.
A0
841 x 1189 mm
A6
105 x 148 mm
A0
A1
A2
A3
A4
A5
A6
A Series Size Diagram
A033.11 in x 46.81 in
A123.39 in x 33.11 in
A216.54 in x 23.39 in
A311.69 in x 16.54 in
A48.27 in x 11.69 in
A55.83 in x 8.27 in
A64.13 in x 5.83 in
A Series Reference Table
| Name | Width (mm) | Height (mm) | Width (cm) | Height (cm) | Width (in) | Height (in) |
|---|---|---|---|---|---|---|
| A0 | 841 | 1189 | 84.10 | 118.90 | 33.11 | 46.81 |
| A1 | 594 | 841 | 59.40 | 84.10 | 23.39 | 33.11 |
| A2 | 420 | 594 | 42.00 | 59.40 | 16.54 | 23.39 |
| A3 | 297 | 420 | 29.70 | 42.00 | 11.69 | 16.54 |
| A4 | 210 | 297 | 21.00 | 29.70 | 8.27 | 11.69 |
| A5 | 148 | 210 | 14.80 | 21.00 | 5.83 | 8.27 |
| A6 | 105 | 148 | 10.50 | 14.80 | 4.13 | 5.83 |
The Story ofA Series
The A Series became the global workhorse because it solves a practical design problem elegantly: every step down in size preserves the same aspect ratio. That means layouts scale cleanly from A0 to A10 without distortion, a dream for designers building campaigns across posters, brochures, and handouts.
Its roots are European standardization efforts that later became ISO 216. In modern practice, A4 is the daily default across most countries, while A3 and A5 often bookend creative production from spreads to pocket formats.