B4 vs A4
B4 is 40 mm wider and 56 mm taller than A4. They are close but not interchangeable: a layout built for one clips or leaves a border on the other.
Compare a Different Pair
B4 and A4, Side by Side
| B4 | A4 | Difference | |
|---|---|---|---|
| Millimetres | 250 × 353 | 210 × 297 | 40 × 56 mm |
| Inches | 9.84 × 13.9 | 8.27 × 11.69 | 1.57 × 2.2 in |
| Centimetres | 25.0 × 35.3 | 21.0 × 29.7 | |
| Area | 0.0882 m², 88,250 mm² | 0.0624 m², 62,370 mm² | 1.41× |
| Aspect ratio | 1 : 1.412 (√2) | 1 : 1.414 (√2) | same |
What Is Lost Printing One on the Other
At 100% scale, both centred, nothing resized. A positive figure on the wider or taller side is cropped; on the other it is a blank margin.
| Axis | Gap | B4 onto A4 | A4 onto B4 |
|---|---|---|---|
| Width | 20 mm (0.79 in) each side | B4 loses it | blank band |
| Height | 28 mm (1.1 in) each end | B4 loses it | blank band |
Scale-to-Fit Percentages
The figure to type into a printer or PDF dialog to scale one to fit inside the other:
| A4 to fit B4 | 119% | leaves a thin border on one pair of edges |
|---|---|---|
| B4 to fit A4 | 84% | leaves a thin border on one pair of edges |
The two share the 1 : √2 shape but are not one halving apart, so a fit-to-page scale still leaves a small border.
Beyond the Measurements
Envelopes: B4 has no standard fitted envelope; A4 fits C4, C5, DL.
Frequently Asked Questions
Is B4 bigger than A4?
B4 is bigger. It is 250 × 353 mm against 210 × 297 mm for A4, about 1.41 times the area.
What is the difference between B4 and A4?
B4 is 40 mm wider and 56 mm taller than A4. They are close but not interchangeable: a layout built for one clips or leaves a border on the other.
Can you print A4 on B4?
Not at full size without a change. Shrink A4 to 119% to fit B4, which leaves a thin border, or print at 100% and lose 20 mm off each side and 28 mm top and bottom.
✓ Dimensions per the standards on the B4 and A4 pages. Differences and scale factors computed. Reviewed . Editorial Process →