B1 vs JIS B1

Q: Which is bigger, B1 or JIS B1?

JIS B1 — 728 × 1030 mm against 707 × 1000 mm, which is 6.1% more area.

	B1	JIS B1
Millimetres	707 × 1000	728 × 1030
Inches	27.83 × 39.37	28.66 × 40.55
Centimetres	70.7 × 100	72.8 × 103
Aspect ratio	1:1.41	1:1.41
Area	7070 cm²	7498.4 cm²

Which is bigger

B1 and JIS B1 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 B1, by 6.1% in area. JIS B1 is 21 mm wider than B1. JIS B1 is 30 mm taller.

Printing one on the other

A B1 page fits inside JIS B1 whole — print it at 100% and you get a 10.5 mm border down each side and 15 mm top and bottom.

You want	Set the print scale to	Leaves
B1 artwork on JIS B1 paper	103%	0 × 0.3 mm margin
JIS B1 artwork on B1 paper	97.1%	0.2 × 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 B1 and JIS B1?

B1 is 707 × 1000 mm and JIS B1 is 728 × 1030 mm. JIS B1 is the larger of the two by 6.1% in area.

Can I print B1 on JIS B1?

Yes, at 100% — B1 is smaller on both edges, so it lands inside JIS B1 with a border all round.

Which is bigger, B1 or JIS B1?

JIS B1 — 728 × 1030 mm against 707 × 1000 mm, which is 6.1% more area.

Related comparisons

B1 in full · JIS B1 in full · All size comparisons · All paper sizes