C4 vs JIS B4

Q: Which is bigger, C4 or JIS B4?

JIS B4 — 257 × 364 mm against 229 × 324 mm, which is 26.1% more area.

	C4	JIS B4
Millimetres	229 × 324	257 × 364
Inches	9.02 × 12.76	10.12 × 14.33
Centimetres	22.9 × 32.4	25.7 × 36.4
Aspect ratio	1:1.41	1:1.42
Area	742 cm²	935.5 cm²

Which is bigger

C4 and JIS B4 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 B4, by 26.1% in area. JIS B4 is 28 mm wider than C4. JIS B4 is 40 mm taller.

Printing one on the other

A C4 page fits inside JIS B4 whole — print it at 100% and you get a 14 mm border down each side and 20 mm top and bottom.

You want	Set the print scale to	Leaves
C4 artwork on JIS B4 paper	112.2%	0 × 0.4 mm margin
JIS B4 artwork on C4 paper	89%	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

The proportions differ: C4 is 1:1.41 and JIS B4 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 0.4 mm of unwanted margin.

Frequently asked questions

What is the difference between C4 and JIS B4?

C4 is 229 × 324 mm and JIS B4 is 257 × 364 mm. JIS B4 is the larger of the two by 26.1% in area.

Can I print C4 on JIS B4?

Yes, at 100% — C4 is smaller on both edges, so it lands inside JIS B4 with a border all round.

Which is bigger, C4 or JIS B4?

JIS B4 — 257 × 364 mm against 229 × 324 mm, which is 26.1% more area.

Related comparisons

C4 in full · JIS B4 in full · All size comparisons · All paper sizes