B3 paper size
353 × 500 mm
13.9 × 19.69 inches · 35.3 × 50 cm · aspect ratio 1:1.42
B3 size is 353 × 500 mm. Those are the B3 dimensions a printer works to; the same sheet in centimetres, inches, points and pixels is below.
What B3 is for
B3 at 353 × 500 mm falls between A3 and A2, and is used for posters and larger brochures where A3 is slightly too small to carry the design. It is a common size for cover proofs and dust jackets.
B3 dimensions in every unit
| Unit | Width | Height |
|---|---|---|
| Millimetres | 353 mm | 500 mm |
| Centimetres | 35.3 cm | 50 cm |
| Inches | 13.9 in | 19.69 in |
| Points (PostScript) | 1001 pt | 1417 pt |
B3 in pixels
Pixel dimensions depend entirely on the resolution you are working at — there is no single "pixel size" for a sheet of paper. B3 size in pixels has every resolution, with file sizes and canvas setup.
| Resolution | Pixels | Use |
|---|---|---|
| 72 DPI | 1001 × 1417 | Screen preview only — far too coarse to print |
| 150 DPI | 2085 × 2953 | Draft printing, internal documents |
| 300 DPI | 4169 × 5906 | The standard for commercial print |
| 600 DPI | 8339 × 11811 | 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 B3 relates to the rest of the series
B3 is B0 halved 3 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 8 sheets of B3 exactly one sheet of B0, with nothing left over. The area works out at 0.125 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 B3 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 B3
Between A3 and A2 — used for posters and larger brochures.
Other ISO B series sizes
| Size | Millimetres | Inches |
|---|---|---|
| B0 | 1000 × 1414 mm | 39.37 × 55.67 in |
| B1 | 707 × 1000 mm | 27.83 × 39.37 in |
| B2 | 500 × 707 mm | 19.69 × 27.83 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 B3 in mm?
353 × 500 mm.
What size is B3 in inches?
13.9 × 19.69 inches.
What size is B3 in pixels?
There is no single answer — it depends on resolution. At the print standard of 300 DPI it is 4169 × 5906 pixels; at 72 DPI it is only 1001 × 1417.