B4 Paper Size
B4 measures 250 × 353 mm (9.84 × 13.90 inches), falling between A4 and A3 in the ISO 216 standard. B4 is commonly used for newspapers, books, envelopes, and large greeting cards. It is especially popular as an envelope size, since B4 envelopes fit A4 documents without folding.
What Size is B4 in Inches?
B4 is 9.84 × 13.90 inches (250 × 353 mm), between A3 and A4 in size and commonly used for envelopes that hold unfolded A4 documents.
| Unit | Width | Height |
|---|---|---|
| Inches | 9.84 | 13.90 |
| Millimeters | 250 | 353 |
| Centimeters | 25.0 | 35.3 |
B4 in Pixels
Pixel dimensions depend on DPI (dots per inch). 300 DPI is the standard for commercial printing.
| DPI | Width (px) | Height (px) | Use |
|---|---|---|---|
| 72 | 709 | 1001 | Screen display, digital proofs |
| 150 | 1476 | 2085 | Draft printing |
| 300 | 2953 | 4169 | Standard commercial print |
| 600 | 5906 | 8339 | High-quality or fine art print |
Use our free Inches to Pixels converter or Millimeters to Pixels converter to calculate pixel dimensions at any DPI.
B4 with Bleed
Standard bleed for ISO sizes is 3 mm per side. This adds 6 mm to both width and height.
| Measurement | Width | Height |
|---|---|---|
| With bleed (mm) | 256 | 359 |
| With bleed (inches) | 10.08 | 14.13 |
| Pixels at 300 DPI (with bleed) | 3024 | 4240 |
Size Comparison
B4 is half the area of B3 (353 × 500 mm) and double B5 (176 × 250 mm). It is wider and taller than A4 (210 × 297 mm), which is exactly why B4 envelopes are the standard choice for mailing unfolded A4 sheets.
Common Uses
- Envelopes for A4 documents
- Newspapers and broadsheet inserts
- Large greeting cards and invitations
- Books and reference manuals
- Exam papers in some countries
Design Tips
- When designing B4 envelopes, account for the envelope flap and sealing area — the usable print area is smaller than the full sheet.
- Include a 3 mm bleed on all sides for printed envelopes or cards with edge-to-edge artwork.
- At 300 DPI, B4 is about 12 megapixels — lightweight for modern design software.
- If your audience spans ISO and US markets, note that B4 is close in size to US Legal (8.5 × 14 in) but not interchangeable.
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