C Envelope Paper Sizes
C10
28 x 40
mm
mm
C9
40 x 57
mm
mm
C8
57 x 81
mm
mm
C7
81 x 114
mm
mm
C6
114 x 162
mm
mm
C5
162 x 229
mm
mm
C4
229 x 324
mm
mm
C3
324 x 458
mm
mm
C2
458 x 648
mm
mm
C1
648 x 917
mm
mm
C0
917 x 1297
mm
mm
Information
The C series (ISO 269) is designed for envelopes. A C4 envelope fits an unfolded A4 sheet; C5 fits A5, and so on.
C Envelope Paper Sizes — Width x Height (mm) / Width x Height (inches)
| Format | Width x Height (mm) | Width x Height (inches) |
|---|---|---|
| C10 | 28 x 40 | 1.1 x 1.57 |
| C9 | 40 x 57 | 1.57 x 2.24 |
| C8 | 57 x 81 | 2.24 x 3.19 |
| C7 | 81 x 114 | 3.19 x 4.49 |
| C6 | 114 x 162 | 4.49 x 6.38 |
| C5 | 162 x 229 | 6.38 x 9.02 |
| C4 | 229 x 324 | 9.02 x 12.76 |
| C3 | 324 x 458 | 12.76 x 18.03 |
| C2 | 458 x 648 | 18.03 x 25.51 |
| C1 | 648 x 917 | 25.51 x 36.1 |
| C0 | 917 x 1297 | 36.1 x 51.06 |