JIS B6 vs Envelope No. 12
| JIS B6 | Envelope No. 12 | |
|---|---|---|
| Millimetres | 128 × 182 | 120.65 × 279.4 |
| Inches | 5.04 × 7.17 | 4.75 × 11 |
| Centimetres | 12.8 × 18.2 | 12.1 × 27.9 |
| Aspect ratio | 1:1.42 | 1:2.32 |
| Area | 233 cm² | 337.1 cm² |
Which is bigger
Envelope No. 12, by 44.7% in area. JIS B6 is 7.3 mm wider than Envelope No. 12. Envelope No. 12 is 97.4 mm taller.
Printing one on the other
Neither sheet fits inside the other at full size: JIS B6 is the wider of the two while Envelope No. 12 is the taller, so each overruns the other on one edge. Whichever way you go, something has to scale or crop.
| You want | Set the print scale to | Leaves |
|---|---|---|
| JIS B6 artwork on Envelope No. 12 paper | 94.3% | 0 × 107.9 mm margin |
| Envelope No. 12 artwork on JIS B6 paper | 65.1% | 49.4 × 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 Envelope No. 12 is 1:2.32. 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 107.9 mm of unwanted margin.
Frequently asked questions
What is the difference between JIS B6 and Envelope No. 12?
JIS B6 is 128 × 182 mm and Envelope No. 12 is 120.65 × 279.4 mm. Envelope No. 12 is the larger of the two by 44.7% in area.
Can I print JIS B6 on Envelope No. 12?
Not at full size. Scale it to 94.3% and it fits inside Envelope No. 12 with 0 × 107.9 mm to spare.
Which is bigger, JIS B6 or Envelope No. 12?
Envelope No. 12 — 120.65 × 279.4 mm against 128 × 182 mm, which is 44.7% more area.
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JIS B6 in full · Envelope No. 12 in full · All size comparisons · All paper sizes