C1 size
648 × 917 mm · 25.51 × 36.1 in · 1836.9 × 2599.4 pt
Where it comes from
Half of C0: the C0 sheet's long side (1297 mm) halves and rounds down to 648 mm — ISO 216's halve-and-floor rule.
Source: Markus Kuhn — International standard paper sizes (CC BY 4.0)
Pixels at print resolutions
| DPI | Pixels (portrait) | Typical use |
|---|---|---|
| 72 | 1837 × 2599 | legacy screens |
| 96 | 2449 × 3466 | CSS reference |
| 150 | 3827 × 5415 | everyday print |
| 300 | 7654 × 10831 | quality print |
| 600 | 15307 × 21661 | fine art / line work |