Envelope size
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[edit] International standard sizes
International standard ISO 269 defines several standard envelope sizes, which are designed for use with ISO 216 standard paper sizes:
| Format | Dimensions (mm) | Suitable for content format |
|---|---|---|
| DL | 110 × 220 | 1/3 A4 |
| C7/C6 | 81 x 162 | 1/3 A5 |
| C6 | 114 × 162 | A6 (A4 folded twice) |
| C6/C5 | 114 × 229 | 1/3 A4 |
| C5 | 162 × 229 | A5 (A4 folded once) |
| C4 | 229 × 324 | A4 |
| C3 | 324 × 458 | A3 |
| B6 | 125 × 176 | C6 |
| B5 | 176 × 250 | C5 |
| B4 | 250 × 353 | C4 |
| E3 | 280 × 400 | B4 |
The German standard DIN 678 defines a similar list of envelope formats.
[edit] North American sizes
There are dozens of sizes of envelopes available. Not all are used for posting mail, but for such things as former pay packets or putting a gift card or a key in. US and presumably Canadian postal regulations differ from those of the rest of the world; although envelopes are still deliverable worldwide by the regulations of the Universal Postal Union, the sorting machines will not accept the European sizes. This is not as much a difference as usually thought, for the location of sending address and return address differ between Germany and France, for example.
Most envelope sizes in this system have names, not designations. The designations under the system "A2", etc., do not correspond to DIN paper sizes.
| Format | Dimensions (in) | Dimensions (mm) | Ratio |
|---|---|---|---|
| A2 | 4 3/8 × 5 3/4 | 110.3 × 144.9 | 131% |
| A6 | 4 3/4 × 6 1/2 | 119.7 × 163.8 | 137% |
| A7 | 5 1/4 × 7 1/4 | 132.3 × 182.7 | 138% |
| No. 8 | 3 5/8 × 6 1/2 | 92.1 × 165.1 | 179% |
| No. 9 | 3 7/8 × 8 7/8 | 98.5 × 225.5 | 229% |
| No. 10 | 4 1/8 × 9 1/2 | 104.0 × 239.4 | 230% |
