Half Letter vs A10 Envelope (US)
| Half Letter | A10 Envelope (US) | |
|---|---|---|
| Millimetres | 139.7 × 215.9 | 152.4 × 241.3 |
| Inches | 5.5 × 8.5 | 6 × 9.5 |
| Centimetres | 14 × 21.6 | 15.2 × 24.1 |
| Aspect ratio | 1:1.55 | 1:1.58 |
| Area | 301.6 cm² | 367.7 cm² |
Which is bigger
A10 Envelope (US), by 21.9% in area. A10 Envelope (US) is 12.7 mm wider than Half Letter. A10 Envelope (US) is 25.4 mm taller.
Printing one on the other
A Half Letter page fits inside A10 Envelope (US) whole — print it at 100% and you get a 6.4 mm border down each side and 12.7 mm top and bottom.
| You want | Set the print scale to | Leaves |
|---|---|---|
| Half Letter artwork on A10 Envelope (US) paper | 109.1% | 0 × 5.8 mm margin |
| A10 Envelope (US) artwork on Half Letter paper | 89.5% | 3.3 × 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: Half Letter is 1:1.55 and A10 Envelope (US) is 1:1.58. 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 5.8 mm of unwanted margin.
Frequently asked questions
What is the difference between Half Letter and A10 Envelope (US)?
Half Letter is 139.7 × 215.9 mm and A10 Envelope (US) is 152.4 × 241.3 mm. A10 Envelope (US) is the larger of the two by 21.9% in area.
Can I print Half Letter on A10 Envelope (US)?
Yes, at 100% — Half Letter is smaller on both edges, so it lands inside A10 Envelope (US) with a border all round.
Which is bigger, Half Letter or A10 Envelope (US)?
A10 Envelope (US) — 152.4 × 241.3 mm against 139.7 × 215.9 mm, which is 21.9% more area.
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