ISO B series
B10 paper size
B10 measures 31 x 44 mm (1.22 x 1.73 in). Part of the ISO B series.
31 x 44millimetres
1.22 x 1.73inches
366 x 520pixels @ 300 dpi
Dimensions in every unit
| Unit | Width x height |
|---|---|
| Millimetres | 31 x 44 mm |
| Centimetres | 3.1 x 4.4 cm |
| Inches (decimal) | 1.22 x 1.732 in |
| Inches (fraction) | 1 1/4 x 1 3/4 in |
| Points (1/72 in) | 87.9 x 124.7 pt |
| Picas | 7.32 x 10.39 pc |
Pixel dimensions by resolution
| Resolution | Pixels | Megapixels |
|---|---|---|
| 72 dpi | 88 x 125 px | 0 MP |
| 96 dpi | 117 x 166 px | 0 MP |
| 150 dpi | 183 x 260 px | 0 MP |
| 200 dpi | 244 x 346 px | 0.1 MP |
| 300 dpi | 366 x 520 px | 0.2 MP |
| 600 dpi | 732 x 1,039 px | 0.8 MP |
300 dpi is the usual target for printed photos and artwork; 72–96 dpi is screen resolution.
Document size with bleed
| Bleed | Millimetres | Inches |
|---|---|---|
| 3 mm bleed (each side) | 37 x 50 mm | 1.457 x 1.969 in |
| 0.125 in bleed (each side) | 37.4 x 50.4 mm | 1.47 x 1.982 in |
How many B10 fit on a press sheet
| Sheet | Without bleed | With 3 mm bleed |
|---|---|---|
| A4 | 36-up | 32-up |
| A3 | 81-up | 64-up |
| SRA3 | 100-up | 72-up |
| Letter | 36-up | 28-up |
| Tabloid 11 x 17 in | 81-up | 56-up |
| 12 x 18 in | 90-up | 72-up |
| 13 x 19 in (Super B) | 105-up | 78-up |
| B2 (offset) | 256-up | 190-up |
Simple grid imposition with no gutters or gripper margin; real layouts may fit fewer.
Envelopes for B10
| Fold | Folded size | Envelopes that fit |
|---|---|---|
| Unfolded | 31 x 44 mm | C9 envelope, C8 envelope |
| Folded in half | 22 x 31 mm | C10 envelope, C9 envelope, C8 envelope |
| Folded in thirds | 14.7 x 31 mm | C10 envelope, C9 envelope, C8 envelope |
The √2 system
B10 has an aspect ratio of 1 : 1.4194 — close to √2 (1.4142). Folding or cutting it in half across the long side produces the next smaller size in the series with the same proportions, and two sheets side by side form the next larger size. This is why scaling between sizes in the series (for example on a photocopier) never crops or distorts the page.
Similar sizes
Frequently asked questions
What are the dimensions of B10?
B10 is 31 x 44 mm, which is 1.22 x 1.73 in (1 1/4 x 1 3/4 in).
How many pixels is B10 at 300 DPI?
366 x 520 pixels at 300 dpi, or 183 x 260 at 150 dpi.
Sources & data
- Dimensions per the relevant standard; see sources.