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
ISO 269 envelopes designed to fit A-series paper.
C Envelope Paper Sizes — Width × Height (mm) / Width × Height (inches)
| Format | Width × Height (mm) | Width × Height (inches) |
|---|---|---|
| C10 | 28 × 40 | 1.1 × 1.57 |
| C9 | 40 × 57 | 1.57 × 2.24 |
| C8 | 57 × 81 | 2.24 × 3.19 |
| C7 | 81 × 114 | 3.19 × 4.49 |
| C6 | 114 × 162 | 4.49 × 6.38 |
| C5 | 162 × 229 | 6.38 × 9.02 |
| C4 | 229 × 324 | 9.02 × 12.76 |
| C3 | 324 × 458 | 12.76 × 18.03 |
| C2 | 458 × 648 | 18.03 × 25.51 |
| C1 | 648 × 917 | 25.51 × 36.1 |
| C0 | 917 × 1297 | 36.1 × 51.06 |