A8 vs JIS B8

Q: Which is bigger, A8 or JIS B8?

JIS B8 — 64 × 91 mm against 52 × 74 mm, which is 51.4% more area.

	A8	JIS B8
Millimetres	52 × 74	64 × 91
Inches	2.05 × 2.91	2.52 × 3.58
Centimetres	5.2 × 7.4	6.4 × 9.1
Aspect ratio	1:1.42	1:1.42
Area	38.5 cm²	58.2 cm²

Which is bigger

A8 and JIS B8 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 B8, by 51.4% in area. JIS B8 is 12 mm wider than A8. JIS B8 is 17 mm taller.

Printing one on the other

A A8 page fits inside JIS B8 whole — print it at 100% and you get a 6 mm border down each side and 8.5 mm top and bottom.

You want	Set the print scale to	Leaves
A8 artwork on JIS B8 paper	123%	0.1 × 0 mm margin
JIS B8 artwork on A8 paper	81.3%	0 × 0.1 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 1:1.42 proportions, so artwork scales between them without any cropping or extra margin — only the size changes.

Frequently asked questions

What is the difference between A8 and JIS B8?

A8 is 52 × 74 mm and JIS B8 is 64 × 91 mm. JIS B8 is the larger of the two by 51.4% in area.

Can I print A8 on JIS B8?

Yes, at 100% — A8 is smaller on both edges, so it lands inside JIS B8 with a border all round.

Which is bigger, A8 or JIS B8?

JIS B8 — 64 × 91 mm against 52 × 74 mm, which is 51.4% more area.

Related comparisons

A8 in full · JIS B8 in full · All size comparisons · All paper sizes