A6 vs JIS B6

Q: Which is bigger, A6 or JIS B6?

JIS B6 — 128 × 182 mm against 105 × 148 mm, which is 49.9% more area.

	A6	JIS B6
Millimetres	105 × 148	128 × 182
Inches	4.13 × 5.83	5.04 × 7.17
Centimetres	10.5 × 14.8	12.8 × 18.2
Aspect ratio	1:1.41	1:1.42
Area	155.4 cm²	233 cm²

Which is bigger

A6 and JIS B6 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 B6, by 49.9% in area. JIS B6 is 23 mm wider than A6. JIS B6 is 34 mm taller.

Printing one on the other

A A6 page fits inside JIS B6 whole — print it at 100% and you get a 11.5 mm border down each side and 17 mm top and bottom.

You want	Set the print scale to	Leaves
A6 artwork on JIS B6 paper	121.9%	0 × 1.6 mm margin
JIS B6 artwork on A6 paper	81.3%	0.9 × 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: A6 is 1:1.41 and JIS B6 is 1:1.42. 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 1.6 mm of unwanted margin.

Frequently asked questions

What is the difference between A6 and JIS B6?

A6 is 105 × 148 mm and JIS B6 is 128 × 182 mm. JIS B6 is the larger of the two by 49.9% in area.

Can I print A6 on JIS B6?

Yes, at 100% — A6 is smaller on both edges, so it lands inside JIS B6 with a border all round.

Which is bigger, A6 or JIS B6?

JIS B6 — 128 × 182 mm against 105 × 148 mm, which is 49.9% more area.

Related comparisons

A6 in full · JIS B6 in full · All size comparisons · All paper sizes