A8 Envelope (US) vs A9 Envelope (US)

Q: Which is bigger, A8 Envelope (US) or A9 Envelope (US)?

A9 Envelope (US) — 146.05 × 222.25 mm against 139.7 × 206.375 mm, which is 12.6% more area.

	A8 Envelope (US)	A9 Envelope (US)
Millimetres	139.7 × 206.375	146.05 × 222.25
Inches	5.5 × 8.13	5.75 × 8.75
Centimetres	14 × 20.6	14.6 × 22.2
Aspect ratio	1:1.48	1:1.52
Area	288.3 cm²	324.6 cm²

Which is bigger

A9 Envelope (US), by 12.6% in area. A9 Envelope (US) is 6.4 mm wider than A8 Envelope (US). A9 Envelope (US) is 15.9 mm taller.

Printing one on the other

A A8 Envelope (US) page fits inside A9 Envelope (US) whole — print it at 100% and you get a 3.2 mm border down each side and 7.9 mm top and bottom.

You want	Set the print scale to	Leaves
A8 Envelope (US) artwork on A9 Envelope (US) paper	104.5%	0 × 6.5 mm margin
A9 Envelope (US) artwork on A8 Envelope (US) paper	92.9%	4.1 × 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: A8 Envelope (US) is 1:1.48 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 6.5 mm of unwanted margin.

Frequently asked questions

What is the difference between A8 Envelope (US) and A9 Envelope (US)?

A8 Envelope (US) is 139.7 × 206.375 mm and A9 Envelope (US) is 146.05 × 222.25 mm. A9 Envelope (US) is the larger of the two by 12.6% in area.

Can I print A8 Envelope (US) on A9 Envelope (US)?

Yes, at 100% — A8 Envelope (US) is smaller on both edges, so it lands inside A9 Envelope (US) with a border all round.

Which is bigger, A8 Envelope (US) or A9 Envelope (US)?

A9 Envelope (US) — 146.05 × 222.25 mm against 139.7 × 206.375 mm, which is 12.6% more area.

Related comparisons

A8 Envelope (US) in full · A9 Envelope (US) in full · All size comparisons · All paper sizes