JIS B6 vs A9 Envelope (US)
| JIS B6 | A9 Envelope (US) | |
|---|---|---|
| Millimetres | 128 × 182 | 146.05 × 222.25 |
| Inches | 5.04 × 7.17 | 5.75 × 8.75 |
| Centimetres | 12.8 × 18.2 | 14.6 × 22.2 |
| Aspect ratio | 1:1.42 | 1:1.52 |
| Area | 233 cm² | 324.6 cm² |
Which is bigger
A9 Envelope (US), by 39.3% in area. A9 Envelope (US) is 18.1 mm wider than JIS B6. A9 Envelope (US) is 40.2 mm taller.
Printing one on the other
A JIS B6 page fits inside A9 Envelope (US) whole — print it at 100% and you get a 9 mm border down each side and 20.1 mm top and bottom.
| You want | Set the print scale to | Leaves |
|---|---|---|
| JIS B6 artwork on A9 Envelope (US) paper | 114.1% | 0 × 14.6 mm margin |
| A9 Envelope (US) artwork on JIS B6 paper | 81.9% | 8.4 × 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: JIS B6 is 1:1.42 and A9 Envelope (US) is 1:1.52. 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 14.6 mm of unwanted margin.
Frequently asked questions
What is the difference between JIS B6 and A9 Envelope (US)?
JIS B6 is 128 × 182 mm and A9 Envelope (US) is 146.05 × 222.25 mm. A9 Envelope (US) is the larger of the two by 39.3% in area.
Can I print JIS B6 on A9 Envelope (US)?
Yes, at 100% — JIS B6 is smaller on both edges, so it lands inside A9 Envelope (US) with a border all round.
Which is bigger, JIS B6 or A9 Envelope (US)?
A9 Envelope (US) — 146.05 × 222.25 mm against 128 × 182 mm, which is 39.3% more area.
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JIS B6 in full · A9 Envelope (US) in full · All size comparisons · All paper sizes