JIS B1 paper size
728 × 1030 mm
28.66 × 40.55 inches · 72.8 × 103 cm · aspect ratio 1:1.41
JIS B1 size is 728 × 1030 mm. Those are the JIS B1 dimensions a printer works to; the same sheet in centimetres, inches, points and pixels is below.
What JIS B1 is for
JIS B1 is 728 × 1030 mm. Used for posters and large-format printing in Japan. At 728 × 1030 mm it is 21 mm wider and 30 mm taller than ISO B1, which is enough to jam a sheet feeder set for the other standard.
JIS B1 dimensions in every unit
| Unit | Width | Height |
|---|---|---|
| Millimetres | 728 mm | 1030 mm |
| Centimetres | 72.8 cm | 103 cm |
| Inches | 28.66 in | 40.55 in |
| Points (PostScript) | 2064 pt | 2920 pt |
JIS B1 in pixels
Pixel dimensions depend entirely on the resolution you are working at — there is no single "pixel size" for a sheet of paper. JIS B1 size in pixels has every resolution, with file sizes and canvas setup.
| Resolution | Pixels | Use |
|---|---|---|
| 72 DPI | 2064 × 2920 | Screen preview only — far too coarse to print |
| 150 DPI | 4299 × 6083 | Draft printing, internal documents |
| 300 DPI | 8598 × 12165 | The standard for commercial print |
| 600 DPI | 17197 × 24331 | 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 JIS B1 relates to the rest of the series
JIS B0 is defined as 1.5 square metres, where ISO A0 is one. JIS B1 is that sheet halved once, so its area is 0.75 m² and 2 of them tile one JIS B0.
That 1.5 against 1 is why the series exists: at 728 × 1030 mm, JIS B1 is about 22% longer on each edge than A1 (594 × 841 mm), filling the gap the A series leaves between one size and the next.
It is not the same sheet as ISO B1, which is 707 × 1000 mm. The two standards share every name in the series and agree on none of the sizes, so a tray, binder or sleeve cut for one will not take the other. Ask a printer for "B1" outside Japan and you will get the ISO sheet.
Scaling between neighbouring JIS B sizes is the same √2 as the A series — 141% up, 71% down — because JIS B is built by halving too. Only the starting area differs.
About JIS B1
JIS B1 is 728 × 1030 mm, the Japanese B series size, which is not the same as ISO B1.
Other JIS B series (Japan) sizes
| Size | Millimetres | Inches |
|---|---|---|
| JIS B0 | 1030 × 1456 mm | 40.55 × 57.32 in |
| JIS B2 | 515 × 728 mm | 20.28 × 28.66 in |
| JIS B3 | 364 × 515 mm | 14.33 × 20.28 in |
| JIS B4 | 257 × 364 mm | 10.12 × 14.33 in |
| JIS B5 | 182 × 257 mm | 7.17 × 10.12 in |
| JIS B6 | 128 × 182 mm | 5.04 × 7.17 in |
| JIS B7 | 91 × 128 mm | 3.58 × 5.04 in |
| JIS B8 | 64 × 91 mm | 2.52 × 3.58 in |
| JIS B9 | 45 × 64 mm | 1.77 × 2.52 in |
| JIS B10 | 32 × 45 mm | 1.26 × 1.77 in |
Frequently asked questions
What size is JIS B1 in mm?
728 × 1030 mm.
What size is JIS B1 in inches?
28.66 × 40.55 inches.
What size is JIS B1 in pixels?
There is no single answer — it depends on resolution. At the print standard of 300 DPI it is 8598 × 12165 pixels; at 72 DPI it is only 2064 × 2920.