C2 Envelope Size
C2 measures 458 × 648 mm (18.03 × 25.51 in). It is the ISO C envelope for an unfolded A2 sheet, a quarter of C0, sitting between A2 and B2.
C2 measures 458 millimetres wide and 648 millimetres tall.
C2 Dimensions in Each Unit
C2 is 458 × 648 mm, which is 45.8 × 64.8 cm or 18.03 × 25.51 in. It is C1 cut in half.
| Unit | Width | Height | Width × height | Copy |
|---|---|---|---|---|
| Millimetres (mm) | 458 | 648 | 458 × 648 mm | |
| Centimetres (cm) | 45.8 | 64.8 | 45.8 × 64.8 cm | |
| Metres (m) | 0.458 | 0.648 | 0.458 × 0.648 m | |
| Inches (in) | 18.03 | 25.51 | 18.03 × 25.51 in | |
| Feet (ft) | 1.5 | 2.13 | 1.5 × 2.13 ft | |
| Points (pt) | 1298 | 1837 | 1298 × 1837 pt | |
| Picas (pc) | 108.2 | 153.1 | 108.2 × 153.1 pc | |
| Pixels at 72 DPI | 1298 | 1837 | 1298 × 1837 px | |
| Pixels at 150 DPI | 2705 | 3827 | 2705 × 3827 px | |
| Pixels at 300 DPI | 5409 | 7654 | 5409 × 7654 px | |
| Pixels at 600 DPI | 10819 | 15307 | 10819 × 15307 px |
Pixel counts follow from the resolution: pixels = millimetres ÷ 25.4 × DPI. More on the DPI and pixels page.
C2 Shape and Area
| Aspect ratio | 1 : 1.415 (√2) |
|---|---|
| Area | 0.297 m² · 296,784 mm² |
| Diagonal | 793.5 mm · 31.24 in |
| ISO 216 tolerance | ± 2 mm (458 mm side) · ± 3 mm (648 mm side) |
| Governing standard | ISO 216:2007 |
C2 to Scale
C2 is half of C1 and folds in half to C3. Put C2 next to another size in the comparison tool.
Frequently Asked Questions
What size is a C2 envelope?
C2 is 458 by 648 mm, or 18.03 by 25.51 inches, sized for an unfolded A2 sheet.
What fits in a C2 envelope?
An A2 sheet flat, or an A1 sheet folded once in half.
Which is bigger, C1 or C2?
C1 is the bigger of the two, at 648 × 917 mm against 458 × 648 mm for C2. It has twice the area, so two C2 envelopes cover one C1.
Envelope Sizes
✓ Dimensions per ISO 216:2007; unit values derived by formula. Reviewed . Editorial Process →