ISO 269 — C series (envelopes)
C1 size
648 × 917 mm
25.51 × 36.10 in · 64.8 × 91.7 cm
C1 measures 648 × 917 mm (64.8 × 91.7 cm; 25.51 × 36.10 in). At 300 DPI that is 7654 × 10831 pixels.
Millimetres
648 × 917 mm
Centimetres
64.8 × 91.7 cm
Inches
25.51 × 36.10 in
Points (pt)
1837 × 2599 pt
C1 in pixels
| DPI | Pixels (portrait) | Typical use |
|---|---|---|
| 72 | 1837 × 2599 | Legacy screen standard, PDF points |
| 96 | 2449 × 3466 | Screens, CSS pixels |
| 150 | 3827 × 5415 | Everyday printing |
| 300 | 7654 × 10831 | Print quality |
Adjacent sizes
FAQ — C1
What size is C1 in centimetres?
C1 is 64.8 × 91.7 cm (648 × 917 mm) in portrait orientation.
How many pixels is C1?
It depends on the resolution: at 300 DPI (print) C1 is 7654 × 10831 pixels; at 96 DPI (screen) it is 2449 × 3466 pixels.
What is C1 used for?
Envelope for a flat A1 sheet.