Index Card 3×5 vs JIS B7
| Index Card 3×5 | JIS B7 | |
|---|---|---|
| Millimetres | 76.2 × 127 | 91 × 128 |
| Inches | 3 × 5 | 3.58 × 5.04 |
| Centimetres | 7.6 × 12.7 | 9.1 × 12.8 |
| Aspect ratio | 1:1.67 | 1:1.41 |
| Area | 96.8 cm² | 116.5 cm² |
Which is bigger
JIS B7, by 20.4% in area. JIS B7 is 14.8 mm wider than Index Card 3×5. JIS B7 is 1 mm taller.
Printing one on the other
A Index Card 3×5 page fits inside JIS B7 whole — print it at 100% and you get a 7.4 mm border down each side and 0.5 mm top and bottom.
| You want | Set the print scale to | Leaves |
|---|---|---|
| Index Card 3×5 artwork on JIS B7 paper | 100.8% | 14.2 × 0 mm margin |
| JIS B7 artwork on Index Card 3×5 paper | 83.7% | 0 × 19.8 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: Index Card 3×5 is 1:1.67 and JIS B7 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 14.2 mm of unwanted margin.
Frequently asked questions
What is the difference between Index Card 3×5 and JIS B7?
Index Card 3×5 is 76.2 × 127 mm and JIS B7 is 91 × 128 mm. JIS B7 is the larger of the two by 20.4% in area.
Can I print Index Card 3×5 on JIS B7?
Yes, at 100% — Index Card 3×5 is smaller on both edges, so it lands inside JIS B7 with a border all round.
Which is bigger, Index Card 3×5 or JIS B7?
JIS B7 — 91 × 128 mm against 76.2 × 127 mm, which is 20.4% more area.
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