JIS B7 vs A1 Envelope (US)

Q: Which is bigger, JIS B7 or A1 Envelope (US)?

A1 Envelope (US) — 92.075 × 130.175 mm against 91 × 128 mm, which is 2.9% more area.

	JIS B7	A1 Envelope (US)
Millimetres	91 × 128	92.075 × 130.175
Inches	3.58 × 5.04	3.63 × 5.13
Centimetres	9.1 × 12.8	9.2 × 13
Aspect ratio	1:1.41	1:1.41
Area	116.5 cm²	119.9 cm²

Which is bigger

A1 Envelope (US), by 2.9% in area. A1 Envelope (US) is 1.1 mm wider than JIS B7. A1 Envelope (US) is 2.2 mm taller.

Printing one on the other

A JIS B7 page fits inside A1 Envelope (US) whole — print it at 100% and you get a 0.5 mm border down each side and 1.1 mm top and bottom.

You want	Set the print scale to	Leaves
JIS B7 artwork on A1 Envelope (US) paper	101.2%	0 × 0.7 mm margin
A1 Envelope (US) artwork on JIS B7 paper	98.3%	0.5 × 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

Both sheets have the same 1:1.41 proportions, so artwork scales between them without any cropping or extra margin — only the size changes.

Frequently asked questions

What is the difference between JIS B7 and A1 Envelope (US)?

JIS B7 is 91 × 128 mm and A1 Envelope (US) is 92.075 × 130.175 mm. A1 Envelope (US) is the larger of the two by 2.9% in area.

Can I print JIS B7 on A1 Envelope (US)?

Yes, at 100% — JIS B7 is smaller on both edges, so it lands inside A1 Envelope (US) with a border all round.

Which is bigger, JIS B7 or A1 Envelope (US)?

A1 Envelope (US) — 92.075 × 130.175 mm against 91 × 128 mm, which is 2.9% more area.

Related comparisons

JIS B7 in full · A1 Envelope (US) in full · All size comparisons · All paper sizes