A1 paper size
594 × 841 mm
23.39 × 33.11 inches · 59.4 × 84.1 cm · aspect ratio 1:1.42
A1 in every unit
| Unit | Width | Height |
|---|---|---|
| Millimetres | 594 mm | 841 mm |
| Centimetres | 59.4 cm | 84.1 cm |
| Inches | 23.39 in | 33.11 in |
| Points (PostScript) | 1684 pt | 2384 pt |
A1 in pixels
Pixel dimensions depend entirely on the resolution you are working at — there is no single "pixel size" for a sheet of paper.
| Resolution | Pixels | Use |
|---|---|---|
| 72 DPI | 1684 × 2384 | Screen preview only — far too coarse to print |
| 150 DPI | 3508 × 4967 | Draft printing, internal documents |
| 300 DPI | 7016 × 9933 | The standard for commercial print |
| 600 DPI | 14031 × 19866 | Fine detail, line art, archival scanning |
Setting up a print document? Use 300 DPI and add 3 mm of bleed on every edge unless your printer specifies otherwise.
About A1
Half of A0. Common for posters, technical drawings and exhibition boards.
Why A sizes halve so neatly
The A series is built on a 1:√2 ratio — approximately 1:1.414. That proportion has a unique property: cut the sheet in half across its long side and the two halves keep exactly the same proportions. This is why two A4 sheets make an A3, why scaling A4 artwork to A3 needs no cropping, and why photocopiers have a single "A4 → A3" button that just works.
Other ISO A series sizes
| Size | Millimetres | Inches |
|---|---|---|
| A0 | 841 × 1189 mm | 33.11 × 46.81 in |
| A2 | 420 × 594 mm | 16.54 × 23.39 in |
| A3 | 297 × 420 mm | 11.69 × 16.54 in |
| A4 | 210 × 297 mm | 8.27 × 11.69 in |
| A5 | 148 × 210 mm | 5.83 × 8.27 in |
| A6 | 105 × 148 mm | 4.13 × 5.83 in |
| A7 | 74 × 105 mm | 2.91 × 4.13 in |
| A8 | 52 × 74 mm | 2.05 × 2.91 in |
| A9 | 37 × 52 mm | 1.46 × 2.05 in |
| A10 | 26 × 37 mm | 1.02 × 1.46 in |
Frequently asked questions
What size is A1 in mm?
594 × 841 mm.
What size is A1 in inches?
23.39 × 33.11 inches.
What size is A1 in pixels?
There is no single answer — it depends on resolution. At the print standard of 300 DPI it is 7016 × 9933 pixels; at 72 DPI it is only 1684 × 2384.