A10 vs JIS B10
| A10 | JIS B10 | |
|---|---|---|
| Millimetres | 26 × 37 | 32 × 45 |
| Inches | 1.02 × 1.46 | 1.26 × 1.77 |
| Centimetres | 2.6 × 3.7 | 3.2 × 4.5 |
| Aspect ratio | 1:1.42 | 1:1.41 |
| Area | 9.6 cm² | 14.4 cm² |
Which is bigger
A10 and JIS B10 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 B10, by 49.7% in area. JIS B10 is 6 mm wider than A10. JIS B10 is 8 mm taller.
Printing one on the other
A A10 page fits inside JIS B10 whole — print it at 100% and you get a 3 mm border down each side and 4 mm top and bottom.
| You want | Set the print scale to | Leaves |
|---|---|---|
| A10 artwork on JIS B10 paper | 121.6% | 0.4 × 0 mm margin |
| JIS B10 artwork on A10 paper | 81.3% | 0 × 0.4 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: A10 is 1:1.42 and JIS B10 is 1:1.41. 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 A10 and JIS B10?
A10 is 26 × 37 mm and JIS B10 is 32 × 45 mm. JIS B10 is the larger of the two by 49.7% in area.
Can I print A10 on JIS B10?
Yes, at 100% — A10 is smaller on both edges, so it lands inside JIS B10 with a border all round.
Which is bigger, A10 or JIS B10?
JIS B10 — 32 × 45 mm against 26 × 37 mm, which is 49.7% more area.
Related comparisons
A10 in full · JIS B10 in full · All size comparisons · All paper sizes