JIS B6 vs Envelope No. 9

Q: Can I print JIS B6 on Envelope No. 9?

Not at full size. Scale it to 76.9% and it fits inside Envelope No. 9 with 0 × 85.5 mm to spare.

Q: Which is bigger, JIS B6 or Envelope No. 9?

JIS B6 — 128 × 182 mm against 98.425 × 225.425 mm, which is 5% more area.

	JIS B6	Envelope No. 9
Millimetres	128 × 182	98.425 × 225.425
Inches	5.04 × 7.17	3.88 × 8.88
Centimetres	12.8 × 18.2	9.8 × 22.5
Aspect ratio	1:1.42	1:2.29
Area	233 cm²	221.9 cm²

Which is bigger

JIS B6, by 5% in area. JIS B6 is 29.6 mm wider than Envelope No. 9. Envelope No. 9 is 43.4 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. 9 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. 9 paper	76.9%	0 × 85.5 mm margin
Envelope No. 9 artwork on JIS B6 paper	80.7%	48.5 × 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. 9 is 1:2.29. 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 85.5 mm of unwanted margin.

Frequently asked questions

What is the difference between JIS B6 and Envelope No. 9?

JIS B6 is 128 × 182 mm and Envelope No. 9 is 98.425 × 225.425 mm. JIS B6 is the larger of the two by 5% in area.

Can I print JIS B6 on Envelope No. 9?

Not at full size. Scale it to 76.9% and it fits inside Envelope No. 9 with 0 × 85.5 mm to spare.

Which is bigger, JIS B6 or Envelope No. 9?

JIS B6 — 128 × 182 mm against 98.425 × 225.425 mm, which is 5% more area.

Related comparisons

JIS B6 in full · Envelope No. 9 in full · All size comparisons · All paper sizes