B7 vs JIS B7

Q: Which is bigger, B7 or JIS B7?

JIS B7 — 91 × 128 mm against 88 × 125 mm, which is 5.9% more area.

	B7	JIS B7
Millimetres	88 × 125	91 × 128
Inches	3.46 × 4.92	3.58 × 5.04
Centimetres	8.8 × 12.5	9.1 × 12.8
Aspect ratio	1:1.42	1:1.41
Area	110 cm²	116.5 cm²

Which is bigger

B7 and JIS B7 carry the same number and are not the same sheet. The Japanese B series is defined by area — JIS B0 is 1.5 square metres where A0 is 1 — so a JIS B sheet is half again the area of the A sheet of the same number, and about 22% longer on each edge. The number tells you where a sheet sits in its own series and nothing about which standard it belongs to.

JIS B7, by 5.9% in area. JIS B7 is 3 mm wider than B7. JIS B7 is 3 mm taller.

Printing one on the other

A B7 page fits inside JIS B7 whole — print it at 100% and you get a 1.5 mm border down each side and 1.5 mm top and bottom.

You want	Set the print scale to	Leaves
B7 artwork on JIS B7 paper	102.4%	0.9 × 0 mm margin
JIS B7 artwork on B7 paper	96.7%	0 × 1.2 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: B7 is 1:1.42 and JIS B7 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 0.9 mm of unwanted margin.

Frequently asked questions

What is the difference between B7 and JIS B7?

B7 is 88 × 125 mm and JIS B7 is 91 × 128 mm. JIS B7 is the larger of the two by 5.9% in area.

Can I print B7 on JIS B7?

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

Which is bigger, B7 or JIS B7?

JIS B7 — 91 × 128 mm against 88 × 125 mm, which is 5.9% more area.

Related comparisons

B7 in full · JIS B7 in full · All size comparisons · All paper sizes