A4 vs B4
| A4 | B4 | |
|---|---|---|
| Millimetres | 210 × 297 | 250 × 353 |
| Inches | 8.27 × 11.69 | 9.84 × 13.9 |
| Centimetres | 21 × 29.7 | 25 × 35.3 |
| Aspect ratio | 1:1.41 | 1:1.41 |
| Area | 623.7 cm² | 882.5 cm² |
Which is bigger
B4, by 41.5% in area. B4 is 40 mm wider than A4. B4 is 56 mm taller.
Printing one on the other
A A4 page fits inside B4 whole — print it at 100% and you get a 20 mm border down each side and 28 mm top and bottom.
| You want | Set the print scale to | Leaves |
|---|---|---|
| A4 artwork on B4 paper | 118.9% | 0.4 × 0 mm margin |
| B4 artwork on A4 paper | 84% | 0 × 0.5 mm margin |
These are the numbers for the "custom scale" box in a print dialog. "Fit to page" computes the same thing, but knowing the figure tells you in advance whether the result will look deliberate or accidental.
Why the shapes matter
Both sheets have the same 1:1.41 proportions, so artwork scales between them without any cropping or extra margin — only the size changes.
Frequently asked questions
What is the difference between A4 and B4?
A4 is 210 × 297 mm and B4 is 250 × 353 mm. B4 is the larger of the two by 41.5% in area.
Can I print A4 on B4?
Yes, at 100% — A4 is smaller on both edges, so it lands inside B4 with a border all round.
Which is bigger, A4 or B4?
B4 — 250 × 353 mm against 210 × 297 mm, which is 41.5% more area.
A4 in full · B4 in full · All size comparisons · All paper sizes