Index Card 3×5 vs A1 Envelope (US)

Q: Which is bigger, Index Card 3×5 or A1 Envelope (US)?

A1 Envelope (US) — 92.075 × 130.175 mm against 76.2 × 127 mm, which is 23.9% more area.

	Index Card 3×5	A1 Envelope (US)
Millimetres	76.2 × 127	92.075 × 130.175
Inches	3 × 5	3.63 × 5.13
Centimetres	7.6 × 12.7	9.2 × 13
Aspect ratio	1:1.67	1:1.41
Area	96.8 cm²	119.9 cm²

Which is bigger

A1 Envelope (US), by 23.9% in area. A1 Envelope (US) is 15.9 mm wider than Index Card 3×5. A1 Envelope (US) is 3.2 mm taller.

Printing one on the other

A Index Card 3×5 page fits inside A1 Envelope (US) whole — print it at 100% and you get a 7.9 mm border down each side and 1.6 mm top and bottom.

You want	Set the print scale to	Leaves
Index Card 3×5 artwork on A1 Envelope (US) paper	102.5%	14 × 0 mm margin
A1 Envelope (US) artwork on Index Card 3×5 paper	82.8%	0 × 19.3 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: Index Card 3×5 is 1:1.67 and A1 Envelope (US) is 1:1.41. 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 14 mm of unwanted margin.

Frequently asked questions

What is the difference between Index Card 3×5 and A1 Envelope (US)?

Index Card 3×5 is 76.2 × 127 mm and A1 Envelope (US) is 92.075 × 130.175 mm. A1 Envelope (US) is the larger of the two by 23.9% in area.

Can I print Index Card 3×5 on A1 Envelope (US)?

Yes, at 100% — Index Card 3×5 is smaller on both edges, so it lands inside A1 Envelope (US) with a border all round.

Which is bigger, Index Card 3×5 or A1 Envelope (US)?

A1 Envelope (US) — 92.075 × 130.175 mm against 76.2 × 127 mm, which is 23.9% more area.

Related comparisons

Index Card 3×5 in full · A1 Envelope (US) in full · All size comparisons · All paper sizes