B1 paper size
707 × 1000 mm
27.83 × 39.37 inches · 70.7 × 100 cm · aspect ratio 1:1.41
B1 size is 707 × 1000 mm. Those are the B1 dimensions a printer works to; the same sheet in centimetres, inches, points and pixels is below.
What B1 is for
B1 at 707 × 1000 mm is the common size for large advertising posters in Europe, including most of what appears in bus shelters and station billboards. It is bigger than A1 and smaller than A0, which is exactly what the B series is for. Check whether a print supplier means ISO B1 or JIS B1 before sending artwork — the Japanese standard is about 3% larger.
B1 dimensions in every unit
| Unit | Width | Height |
|---|---|---|
| Millimetres | 707 mm | 1000 mm |
| Centimetres | 70.7 cm | 100 cm |
| Inches | 27.83 in | 39.37 in |
| Points (PostScript) | 2004 pt | 2835 pt |
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. B1 size in pixels has every resolution, with file sizes and canvas setup.
| Resolution | Pixels | Use |
|---|---|---|
| 72 DPI | 2004 × 2835 | Screen preview only — far too coarse to print |
| 150 DPI | 4175 × 5906 | Draft printing, internal documents |
| 300 DPI | 8350 × 11811 | The standard for commercial print |
| 600 DPI | 16701 × 23622 | 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 B1 relates to the rest of the series
B1 is B0 halved once. 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 2 sheets of B1 exactly one sheet of B0, with nothing left over. The area works out at 0.5 m², since B0 is defined as one square metre.
Scaling to the next size up or down is a factor of √2 ≈ 1.414 on each edge, so enlarging B1 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 B1
Common for large advertising posters in Europe.
Other ISO B series sizes
| Size | Millimetres | Inches |
|---|---|---|
| B0 | 1000 × 1414 mm | 39.37 × 55.67 in |
| B2 | 500 × 707 mm | 19.69 × 27.83 in |
| B3 | 353 × 500 mm | 13.9 × 19.69 in |
| B4 | 250 × 353 mm | 9.84 × 13.9 in |
| B5 | 176 × 250 mm | 6.93 × 9.84 in |
| B6 | 125 × 176 mm | 4.92 × 6.93 in |
| B7 | 88 × 125 mm | 3.46 × 4.92 in |
| B8 | 62 × 88 mm | 2.44 × 3.46 in |
| B9 | 44 × 62 mm | 1.73 × 2.44 in |
| B10 | 31 × 44 mm | 1.22 × 1.73 in |
Frequently asked questions
What size is B1 in mm?
707 × 1000 mm.
What size is B1 in inches?
27.83 × 39.37 inches.
What size is B1 in pixels?
There is no single answer — it depends on resolution. At the print standard of 300 DPI it is 8350 × 11811 pixels; at 72 DPI it is only 2004 × 2835.