Are you planning a mailing and trying to create the correct size artwork? Here is a guide to the common envelope sizes and whether they fall into small letter, large letter, or small parcel Royal Mail sizes.
Envelope Sizes
| Envelope Size | Size in mm | Size in cm | Size in inches | Royal Mail size |
|---|---|---|---|---|
| DL | 220 x 110 mm | 22 x 11 cm | 8.66 x 4.33 inches | Small letter |
| C0 | 917 x 1297 mm | 91.7 x 129.7 cm | 36.1 x 51.5 inches | Large parcel |
| C1 | 648 x 917 mm | 64.8 x 91.7 cm | 25.5 x 36.1 inches | Large parcel |
| C2 | 458 x 648 mm | 45.8 x 64.8 cm | 18 x 25.5 inches | Large parcel |
| C3 | 324 x 458 mm | 32.4 x 45.8 cm | 12.8 x 18 inches | Medium parcel |
| C4 | 229 x 324 mm | 22.9 x 32.4 cm | 9 x 12.8 inches | Large letter |
| C5 | 162 x 229 mm | 16.2 x 22.9 cm | 6.4 x 9 inches | Small letter |
| C6 | 114 x 162 mm | 11.4 x 16.2 cm | 4.5 x 6.4 inches | Small letter |
| C7 | 81 x 114 mm | 8.1 x 11.4 cm | 3.2 x 4.5 inches | Small letter |
| C8 | 57 x 81 mm | 5.7 x 8.1 cm | 2.2 x 3.2 inches | Small letter |
| C9 | 40 x 57 mm | 4.0 x 5.7 cm | 1.6 x 2.2 inches | Small letter |
| C10 | 28 x 40 mm | 2.8 x 4 cm | 1.1 x 1.6 inches | Small letter |
Royal Mail sizes are based on a weight of 100 grams.
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