A9 size
37 × 52 mm · 1.46 × 2.05 in · 104.9 × 147.4 pt
Where it comes from
Half of A8: the A8 sheet's long side (74 mm) halves and rounds down to 37 mm — ISO 216's halve-and-floor rule.
Derived from the ISO 216 construction — no lookup required, only arithmetic.
Pixels at print resolutions
| DPI | Pixels (portrait) | Typical use |
|---|---|---|
| 72 | 105 × 147 | legacy screens |
| 96 | 140 × 197 | CSS reference |
| 150 | 219 × 307 | everyday print |
| 300 | 437 × 614 | quality print |
| 600 | 874 × 1228 | fine art / line work |