Half Letter vs JIS B6
| Half Letter | JIS B6 | |
|---|---|---|
| Millimetres | 139.7 × 215.9 | 128 × 182 |
| Inches | 5.5 × 8.5 | 5.04 × 7.17 |
| Centimetres | 14 × 21.6 | 12.8 × 18.2 |
| Aspect ratio | 1:1.55 | 1:1.42 |
| Area | 301.6 cm² | 233 cm² |
Which is bigger
Half Letter, by 29.5% in area. Half Letter is 11.7 mm wider than JIS B6. Half Letter is 33.9 mm taller.
Printing one on the other
A JIS B6 page fits inside Half Letter whole — print it at 100% and you get a 5.8 mm border down each side and 17 mm top and bottom.
| You want | Set the print scale to | Leaves |
|---|---|---|
| Half Letter artwork on JIS B6 paper | 84.3% | 10.2 × 0 mm margin |
| JIS B6 artwork on Half Letter paper | 109.1% | 0 × 17.3 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: Half Letter is 1:1.55 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 10.2 mm of unwanted margin.
Frequently asked questions
What is the difference between Half Letter and JIS B6?
Half Letter is 139.7 × 215.9 mm and JIS B6 is 128 × 182 mm. Half Letter is the larger of the two by 29.5% in area.
Can I print Half Letter on JIS B6?
Not at full size. Scale it to 84.3% and it fits inside JIS B6 with 10.2 × 0 mm to spare.
Which is bigger, Half Letter or JIS B6?
Half Letter — 139.7 × 215.9 mm against 128 × 182 mm, which is 29.5% more area.
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Half Letter in full · JIS B6 in full · All size comparisons · All paper sizes