ARCH B vs JIS B3
| ARCH B | JIS B3 | |
|---|---|---|
| Millimetres | 304.8 × 457.2 | 364 × 515 |
| Inches | 12 × 18 | 14.33 × 20.28 |
| Centimetres | 30.5 × 45.7 | 36.4 × 51.5 |
| Aspect ratio | 1:1.5 | 1:1.41 |
| Area | 1393.5 cm² | 1874.6 cm² |
Which is bigger
JIS B3, by 34.5% in area. JIS B3 is 59.2 mm wider than ARCH B. JIS B3 is 57.8 mm taller.
Printing one on the other
A ARCH B page fits inside JIS B3 whole — print it at 100% and you get a 29.6 mm border down each side and 28.9 mm top and bottom.
| You want | Set the print scale to | Leaves |
|---|---|---|
| ARCH B artwork on JIS B3 paper | 112.6% | 20.7 × 0 mm margin |
| JIS B3 artwork on ARCH B paper | 83.7% | 0 × 26 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 B is 1:1.5 and JIS B3 is 1:1.41. 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 20.7 mm of unwanted margin.
Frequently asked questions
What is the difference between ARCH B and JIS B3?
ARCH B is 304.8 × 457.2 mm and JIS B3 is 364 × 515 mm. JIS B3 is the larger of the two by 34.5% in area.
Can I print ARCH B on JIS B3?
Yes, at 100% — ARCH B is smaller on both edges, so it lands inside JIS B3 with a border all round.
Which is bigger, ARCH B or JIS B3?
JIS B3 — 364 × 515 mm against 304.8 × 457.2 mm, which is 34.5% more area.
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ARCH B in full · JIS B3 in full · All size comparisons · All paper sizes