Half Letter vs A9 Envelope (US)

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

A9 Envelope (US) — 146.05 × 222.25 mm against 139.7 × 215.9 mm, which is 7.6% more area.

	Half Letter	A9 Envelope (US)
Millimetres	139.7 × 215.9	146.05 × 222.25
Inches	5.5 × 8.5	5.75 × 8.75
Centimetres	14 × 21.6	14.6 × 22.2
Aspect ratio	1:1.55	1:1.52
Area	301.6 cm²	324.6 cm²

Which is bigger

A9 Envelope (US), by 7.6% in area. A9 Envelope (US) is 6.4 mm wider than Half Letter. A9 Envelope (US) is 6.3 mm taller.

Printing one on the other

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

You want	Set the print scale to	Leaves
Half Letter artwork on A9 Envelope (US) paper	102.9%	2.2 × 0 mm margin
A9 Envelope (US) artwork on Half Letter paper	95.7%	0 × 3.3 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: Half Letter is 1:1.55 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 2.2 mm of unwanted margin.

Frequently asked questions

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

Half Letter is 139.7 × 215.9 mm and A9 Envelope (US) is 146.05 × 222.25 mm. A9 Envelope (US) is the larger of the two by 7.6% in area.

Can I print Half Letter on A9 Envelope (US)?

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

Which is bigger, Half Letter or A9 Envelope (US)?

A9 Envelope (US) — 146.05 × 222.25 mm against 139.7 × 215.9 mm, which is 7.6% more area.

Related comparisons

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