A10 paper size
26 × 37 mm
1.02 × 1.46 inches · 2.6 × 3.7 cm · aspect ratio 1:1.42
A10 size is 26 × 37 mm. Those are the A10 dimensions a printer works to; the same sheet in centimetres, inches, points and pixels is below.
What A10 is for
A10 is the smallest standard A size at 26 × 37 mm, roughly a postage stamp. It exists to complete the series rather than because much is printed at it; below A8 the sizes are mostly of interest to people cutting sheets down programmatically and needing the ratio to hold.
A10 dimensions in every unit
| Unit | Width | Height |
|---|---|---|
| Millimetres | 26 mm | 37 mm |
| Centimetres | 2.6 cm | 3.7 cm |
| Inches | 1.02 in | 1.46 in |
| Points (PostScript) | 74 pt | 105 pt |
A10 in pixels
Pixel dimensions depend entirely on the resolution you are working at — there is no single "pixel size" for a sheet of paper. A10 size in pixels has every resolution, with file sizes and canvas setup.
| Resolution | Pixels | Use |
|---|---|---|
| 72 DPI | 74 × 105 | Screen preview only — far too coarse to print |
| 150 DPI | 154 × 219 | Draft printing, internal documents |
| 300 DPI | 307 × 437 | The standard for commercial print |
| 600 DPI | 614 × 874 | 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 A10 relates to the rest of the series
A10 is A0 halved 10 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 1,024 sheets of A10 exactly one sheet of A0, with nothing left over. The area works out at 0.000977 m², since A0 is defined as one square metre.
Against the sheet most people picture: 64 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 A10 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 A10
The smallest standard A size — roughly a postage stamp.
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 |
| 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 |
| Super A3 | 329 × 483 mm | 12.95 × 19.02 in |
Frequently asked questions
What size is A10 in mm?
26 × 37 mm.
What size is A10 in inches?
1.02 × 1.46 inches.
What size is A10 in pixels?
There is no single answer — it depends on resolution. At the print standard of 300 DPI it is 307 × 437 pixels; at 72 DPI it is only 74 × 105.