A6 paper size
105 × 148 mm
4.13 × 5.83 inches · 10.5 × 14.8 cm · aspect ratio 1:1.41
A6 size is 105 × 148 mm. Those are the A6 dimensions a printer works to; the same sheet in centimetres, inches, points and pixels is below.
What A6 is for
A6 is postcard size — 105 × 148 mm, a quarter of an A4 — and the standard for small flyers and index cards outside North America. It fits a C6 envelope unfolded, which is the pairing the C series exists for. Postal services generally treat A6 as the minimum size they will handle without a surcharge.
A6 dimensions in every unit
| Unit | Width | Height |
|---|---|---|
| Millimetres | 105 mm | 148 mm |
| Centimetres | 10.5 cm | 14.8 cm |
| Inches | 4.13 in | 5.83 in |
| Points (PostScript) | 298 pt | 420 pt |
A6 in pixels
Pixel dimensions depend entirely on the resolution you are working at — there is no single "pixel size" for a sheet of paper. A6 size in pixels has every resolution, with file sizes and canvas setup.
| Resolution | Pixels | Use |
|---|---|---|
| 72 DPI | 298 × 420 | Screen preview only — far too coarse to print |
| 150 DPI | 620 × 874 | Draft printing, internal documents |
| 300 DPI | 1240 × 1748 | The standard for commercial print |
| 600 DPI | 2480 × 3496 | 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.
How A6 relates to the rest of the series
A6 is A0 halved 6 times. Halving a sheet across its longer side is what generates the next size down, and because the sides are in a 1:√2 ratio the proportions survive every fold — which is the entire reason the series exists.
That makes 64 sheets of A6 exactly one sheet of A0, with nothing left over. The area works out at 0.0156 m², since A0 is defined as one square metre.
Against the sheet most people picture: 4 of these fit on one A4.
Scaling to the next size up or down is a factor of √2 ≈ 1.414 on each edge, so enlarging A6 to the next size is 141% on a photocopier and reducing it is 71%. Those two numbers are on the preset buttons of most copiers for exactly this reason, and they are the same for every size in the series.
About A6
Postcard size. Also the standard for small flyers and index cards outside North America.
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 |
| A1 | 594 × 841 mm | 23.39 × 33.11 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 |
| 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 |
| Super A3 | 329 × 483 mm | 12.95 × 19.02 in |
Frequently asked questions
What size is A6 in mm?
105 × 148 mm.
What size is A6 in inches?
4.13 × 5.83 inches.
What size is A6 in pixels?
There is no single answer — it depends on resolution. At the print standard of 300 DPI it is 1240 × 1748 pixels; at 72 DPI it is only 298 × 420.