A9 vs A10

Q: Can I print A9 on A10?

Not at full size. Scale it to 70.3% and it fits inside A10 with 0 × 0.5 mm to spare.

	A9	A10
Millimetres	37 × 52	26 × 37
Inches	1.46 × 2.05	1.02 × 1.46
Centimetres	3.7 × 5.2	2.6 × 3.7
Aspect ratio	1:1.41	1:1.42
Area	19.2 cm²	9.6 cm²

Which is bigger

A9 and A10 are one step apart in the A series, so one is exactly twice the other. Two A10 sheets side by side make an A9, and folding an A9 in half across its long edge gives two A10. That is what the series is for, and it is why the scale factors below come out at 70.7% and 141.4% — one over the square root of two, and the square root of two.

A9 is 11 mm wider than A10. A9 is 15 mm taller.

Printing one on the other

A A10 page fits inside A9 whole — print it at 100% and you get a 5.5 mm border down each side and 7.5 mm top and bottom.

You want	Set the print scale to	Leaves
A9 artwork on A10 paper	70.3%	0 × 0.5 mm margin
A10 artwork on A9 paper	140.5%	0.5 × 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: A9 is 1:1.41 and A10 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 0.5 mm of unwanted margin.

Frequently asked questions

What is the difference between A9 and A10?

A9 is 37 × 52 mm and A10 is 26 × 37 mm. A9 is the larger of the two by 100% in area.

Can I print A9 on A10?

Not at full size. Scale it to 70.3% and it fits inside A10 with 0 × 0.5 mm to spare.

Which is bigger, A9 or A10?

A9 — 37 × 52 mm against 26 × 37 mm, which is 100% more area.

Related comparisons

A9 in full · A10 in full · All size comparisons · All paper sizes