ARCH A vs JIS B4
| ARCH A | JIS B4 | |
|---|---|---|
| Millimetres | 228.6 × 304.8 | 257 × 364 |
| Inches | 9 × 12 | 10.12 × 14.33 |
| Centimetres | 22.9 × 30.5 | 25.7 × 36.4 |
| Aspect ratio | 1:1.33 | 1:1.42 |
| Area | 696.8 cm² | 935.5 cm² |
Which is bigger
JIS B4, by 34.3% in area. JIS B4 is 28.4 mm wider than ARCH A. JIS B4 is 59.2 mm taller.
Printing one on the other
A ARCH A page fits inside JIS B4 whole — print it at 100% and you get a 14.2 mm border down each side and 29.6 mm top and bottom.
| You want | Set the print scale to | Leaves |
|---|---|---|
| ARCH A artwork on JIS B4 paper | 112.4% | 0 × 21.3 mm margin |
| JIS B4 artwork on ARCH A paper | 83.7% | 13.4 × 0 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
The proportions differ: ARCH A is 1:1.33 and JIS B4 is 1:1.42. That difference is why a layout moved between them never quite lines up — scale it to fit one edge and the other is left with 21.3 mm of unwanted margin.
Frequently asked questions
What is the difference between ARCH A and JIS B4?
ARCH A is 228.6 × 304.8 mm and JIS B4 is 257 × 364 mm. JIS B4 is the larger of the two by 34.3% in area.
Can I print ARCH A on JIS B4?
Yes, at 100% — ARCH A is smaller on both edges, so it lands inside JIS B4 with a border all round.
Which is bigger, ARCH A or JIS B4?
JIS B4 — 257 × 364 mm against 228.6 × 304.8 mm, which is 34.3% more area.
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ARCH A in full · JIS B4 in full · All size comparisons · All paper sizes