Envelope No. 10 vs Envelope No. 12

Q: Which is bigger, Envelope No. 10 or Envelope No. 12?

Envelope No. 12 — 120.65 × 279.4 mm against 104.775 × 241.3 mm, which is 33.3% more area.

	Envelope No. 10	Envelope No. 12
Millimetres	104.775 × 241.3	120.65 × 279.4
Inches	4.13 × 9.5	4.75 × 11
Centimetres	10.5 × 24.1	12.1 × 27.9
Aspect ratio	1:2.3	1:2.32
Area	252.8 cm²	337.1 cm²

Which is bigger

Envelope No. 12, by 33.3% in area. Envelope No. 12 is 15.9 mm wider than Envelope No. 10. Envelope No. 12 is 38.1 mm taller.

Printing one on the other

A Envelope No. 10 page fits inside Envelope No. 12 whole — print it at 100% and you get a 7.9 mm border down each side and 19 mm top and bottom.

You want	Set the print scale to	Leaves
Envelope No. 10 artwork on Envelope No. 12 paper	115.2%	0 × 1.5 mm margin
Envelope No. 12 artwork on Envelope No. 10 paper	86.4%	0.6 × 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: Envelope No. 10 is 1:2.3 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 1.5 mm of unwanted margin.

Frequently asked questions

What is the difference between Envelope No. 10 and Envelope No. 12?

Envelope No. 10 is 104.775 × 241.3 mm and Envelope No. 12 is 120.65 × 279.4 mm. Envelope No. 12 is the larger of the two by 33.3% in area.

Can I print Envelope No. 10 on Envelope No. 12?

Yes, at 100% — Envelope No. 10 is smaller on both edges, so it lands inside Envelope No. 12 with a border all round.

Which is bigger, Envelope No. 10 or Envelope No. 12?

Envelope No. 12 — 120.65 × 279.4 mm against 104.775 × 241.3 mm, which is 33.3% more area.

Related comparisons

Envelope No. 10 in full · Envelope No. 12 in full · All size comparisons · All paper sizes