Japanese JIS B series
JIS B9 paper size
JIS B9 measures 45 x 64 mm (1.77 x 2.52 in). Part of the Japanese JIS B series.
45 x 64millimetres
1.77 x 2.52inches
531 x 756pixels @ 300 dpi
Dimensions in every unit
| Unit | Width x height |
|---|---|
| Millimetres | 45 x 64 mm |
| Centimetres | 4.5 x 6.4 cm |
| Inches (decimal) | 1.772 x 2.52 in |
| Inches (fraction) | 1 3/4 x 2 1/2 in |
| Points (1/72 in) | 127.6 x 181.4 pt |
| Picas | 10.63 x 15.12 pc |
Pixel dimensions by resolution
| Resolution | Pixels | Megapixels |
|---|---|---|
| 72 dpi | 128 x 181 px | 0 MP |
| 96 dpi | 170 x 242 px | 0 MP |
| 150 dpi | 266 x 378 px | 0.1 MP |
| 200 dpi | 354 x 504 px | 0.2 MP |
| 300 dpi | 531 x 756 px | 0.4 MP |
| 600 dpi | 1,063 x 1,512 px | 1.6 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) | 51 x 70 mm | 2.008 x 2.756 in |
| 0.125 in bleed (each side) | 51.4 x 70.4 mm | 2.022 x 2.77 in |
How many JIS B9 fit on a press sheet
| Sheet | Without bleed | With 3 mm bleed |
|---|---|---|
| A4 | 18-up | 16-up |
| A3 | 36-up | 32-up |
| SRA3 | 50-up | 36-up |
| Letter | 18-up | 15-up |
| Tabloid 11 x 17 in | 36-up | 30-up |
| 12 x 18 in | 42-up | 32-up |
| 13 x 19 in (Super B) | 50-up | 36-up |
| B2 (offset) | 121-up | 91-up |
| B1 (offset) | 242-up | 190-up |
Simple grid imposition with no gutters or gripper margin; real layouts may fit fewer.
Envelopes for JIS B9
| Fold | Folded size | Envelopes that fit |
|---|---|---|
| Unfolded | 45 x 64 mm | C8 envelope, C7 envelope |
| Folded in half | 32 x 45 mm | C9 envelope, C8 envelope |
| Folded in thirds | 21.3 x 45 mm | C9 envelope, C8 envelope |
The √2 system
JIS B9 has an aspect ratio of 1 : 1.4222 — 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 JIS B9?
JIS B9 is 45 x 64 mm, which is 1.77 x 2.52 in (1 3/4 x 2 1/2 in).
How many pixels is JIS B9 at 300 DPI?
531 x 756 pixels at 300 dpi, or 266 x 378 at 150 dpi.
Sources & data
- Dimensions per the relevant standard; see sources.