ISO B · ISO 216
B4 paper size
An ISO B-series sheet between A4 and A3, often used when an A-series page needs extra breathing room without moving to the next large size.
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B4 dimensions in every unit
In portrait orientation, width comes first: 250 mm × 353 mm. Rotate the sheet for landscape orientation and the same measurements reverse.
| Unit | Width | Height |
|---|---|---|
| Millimeters | 250 mm | 353 mm |
| Centimeters | 25 cm | 35.3 cm |
| Inches | 9.84 in | 13.9 in |
| Points | 708.7 pt | 1000.6 pt |
Digital artwork
B4 pixel dimensions by DPI
Pixel dimensions depend on output resolution. These values describe the trimmed page only and do not include printer bleed.
| Resolution | Pixel width | Pixel height | Typical use |
|---|---|---|---|
| 72 DPI | 709 px | 1,001 px | Screen preview |
| 96 DPI | 945 px | 1,334 px | Screen preview |
| 150 DPI | 1,476 px | 2,085 px | Draft print |
| 300 DPI | 2,953 px | 4,169 px | Quality print |
| 600 DPI | 5,906 px | 8,339 px | High-detail source |
Proportion & comparison
How B4 relates to nearby sizes
ISO B4 is 47 mm narrower and 67 mm shorter than A3. It is also 7 mm narrower and 11 mm shorter than JIS B4.
- Portrait ratio
- 1 : 1.412
- Area
- 0.0882 m²
- Orientation
- 250 × 353 mm
Works well for
Common B4 uses
- Magazine layouts
- Menus
- Book spreads
- Oversized diagrams
Check before using
Where it can go wrong
- Unqualified “B4” printer presets
- A3 artwork at 100% scale
- North American 11 × 17 workflows
Regional & printer note
Will a printer recognize B4?
ISO B4 is used in publishing and specialty printing. Japan commonly uses the different JIS B4 size of 257 × 364 mm, so the label alone is not enough.
Always match the document size, print-driver size, paper tray, and physical sheet. A driver can silently scale a page even when the preview looks correct.
Measurement source
Checked against the defining standard
Paper Size Lab converts the stored millimeter measurements mathematically; it does not round-trip between units. The underlying sheet family is referenced to the standards organization below.
Read ISO 216:2007Questions people ask
B4 paper FAQ
What are the dimensions of B4 paper?
B4 measures 250 × 353 millimeters, 25 × 35.3 centimeters, or 9.84 × 13.9 inches in portrait orientation.
How many pixels is B4 at 300 DPI?
B4 is 2953 × 4169 pixels at 300 DPI before adding bleed.
Is B4 the same as another paper size?
ISO B4 is 47 mm narrower and 67 mm shorter than A3. It is also 7 mm narrower and 11 mm shorter than JIS B4.
What is B4 commonly used for?
B4 is commonly used for magazine layouts, menus, book spreads, oversized diagrams. Printer, postal, and finishing requirements still vary.