JIS B5 vs Envelope No. 12

Q: Can I print JIS B5 on Envelope No. 12?

Not at full size. Scale it to 66.3% and it fits inside Envelope No. 12 with 0 × 109 mm to spare.

Q: Which is bigger, JIS B5 or Envelope No. 12?

JIS B5 — 182 × 257 mm against 120.65 × 279.4 mm, which is 38.8% more area.

	JIS B5	Envelope No. 12
Millimetres	182 × 257	120.65 × 279.4
Inches	7.17 × 10.12	4.75 × 11
Centimetres	18.2 × 25.7	12.1 × 27.9
Aspect ratio	1:1.41	1:2.32
Area	467.7 cm²	337.1 cm²

Which is bigger

JIS B5, by 38.8% in area. JIS B5 is 61.4 mm wider than Envelope No. 12. Envelope No. 12 is 22.4 mm taller.

Printing one on the other

Neither sheet fits inside the other at full size: JIS B5 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 B5 artwork on Envelope No. 12 paper	66.3%	0 × 109 mm margin
Envelope No. 12 artwork on JIS B5 paper	92%	71 × 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 B5 is 1:1.41 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 109 mm of unwanted margin.

Frequently asked questions

What is the difference between JIS B5 and Envelope No. 12?

JIS B5 is 182 × 257 mm and Envelope No. 12 is 120.65 × 279.4 mm. JIS B5 is the larger of the two by 38.8% in area.

Can I print JIS B5 on Envelope No. 12?

Not at full size. Scale it to 66.3% and it fits inside Envelope No. 12 with 0 × 109 mm to spare.

Which is bigger, JIS B5 or Envelope No. 12?

JIS B5 — 182 × 257 mm against 120.65 × 279.4 mm, which is 38.8% more area.

Related comparisons

JIS B5 in full · Envelope No. 12 in full · All size comparisons · All paper sizes