Dimensions
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ISO 269 describes the C series paper. C series is typically used to define envelope sizes and is closely related to both A and B series paper. Since both A and B paper are widely used, it makes sense to size envelopes for that paper. For example, folding an A4 sized piece of paper in half will fit sngly into a C5 sized envelope.
| Format | Width × Height (mm) | Width × Height (cm) | Width × Height (in) |
|---|---|---|---|
| C0 | 917 × 1297 mm | 91.7 × 129.7 cm | 36.1 × 51.1 in |
| C1 | 648 × 917 mm | 64.8 × 91.7 cm | 25.5 × 36.1 in |
| C2 | 458 × 648 mm | 45.8 × 64.8 cm | 18 × 25.5 in |
| C3 | 324 × 458 mm | 32.4 × 45.8 cm | 12.8 × 18 in |
| C4 | 229 × 324 mm | 22.9 × 32.4 cm | 9 × 12.8 in |
| C5 | 162 × 229 mm | 16.2 × 22.9 cm | 6.4 × 9 in |
| C6 | 114 × 162 mm | 11.4 × 16.2 cm | 4.5 × 6.4 in |
| C7 | 81 × 114 mm | 8.1 × 11.4 cm | 3.2 × 4.5 in |
| C8 | 57 × 81 mm | 5.7 × 8.1 cm | 2.2 × 3.2 in |
| C9 | 40 × 57 mm | 4.0 × 5.7 cm | 1.6 × 2.2 in |
| C10 | 28 × 40 mm | 2.8 × 4.0 cm | 1.1 × 1.6 in |
