Sizes of American watches
One legne = 2.258 mm
One inch = 25.4 mm
| Size | mm | Size | mm |
| 18 | 45.7 | 6/0 | 25.4 |
| 16 | 43.1 | 8/0 | 23.7 |
| 14 | 41.5 | 10/0 | 22.0 |
| 12 | 39.8 | 12/0 | 20.31 |
| 10 | 38.1 | 14/0 | 18.6 |
| 8 | 36.4 | 15/0 | 17.8 |
| 6 | 34.7 | 16/0 | 16.9 |
| 4 | 33.0 | 18/0 | 15.2 |
| 0 | 29.6 | 20/0 | 13.5 |
| 3/0 | 27.9 | 21/0 | 12.7 |
| 4/0 | 27.09 | 22/0 | 11.8 |
| 5/0 | 26.2 | 26/0 | 8.5 |
Sizes of Swiss watches
| Lignes | mm | Lignes | mm |
| 3 | 6.77 | 11¾ | 26.51 |
| 3¼ | 7.38 | 12 | 27.07 |
| 31⁄2 | 7.87 | 12¼ | 27.63 |
| 3¾ | 8.42 | 121⁄2 | 28.20 |
| 4 | 9.03 | 12¾ | 28.79 |
| 4¼ | 9.59 | 13 | 29.33 |
| 41⁄2 | 10.15 | 13¼ | 29.89 |
| 4¾ | 10.72 | 131⁄2 | 30.45 |
| 5 | 11.28 | 13¾ | 31.02 |
| 5¼ | 11.84 | 14 | 31.58 |
| 51⁄2 | 12.40 | 14¼ | 32.15 |
| 5¾ | 12.97 | 141⁄2 | 32.71 |
| 6 | 13.53 | 14¾ | 33.27 |
| 6¼ | 14.10 | 15 | 33.84 |
| 61⁄2 | 14.66 | 15¼ | 34.40 |
| 6¾ | 15.23 | 151⁄2 | 34.98 |
| 7 | 15.79 | 15¾ | 35.53 |
| 7¼ | 16.35 | 16 | 36.09 |
| 71⁄2 | 16.92 | 16¼ | 36.66 |
| 7¾ | 17.48 | 161⁄2 | 37.22 |
| 8 | 18.05 | 16¾ | 37.78 |
| 8¼ | 18.61 | 17 | 38.35 |
| 81⁄2 | 19.17 | 17¼ | 38.91 |
| 8¾ | 19.74 | 171⁄2 | 39.48 |
| 9 | 20.30 | 17¾ | 40.04 |
| 9¼ | 20.87 | 18 | 40.60 |
| 91⁄2 | 21.43 | 18¼ | 41.17 |
| 9¾ | 21.99 | 181⁄2 | 41.73 |
| 10 | 22.56 | 18¾ | 42.30 |
| 10¼ | 23.14 | 19 | 42.86 |
| 101⁄2 | 23.69 | 19¼ | 43.42 |
| 10¾ | 24.45 | 191⁄2 | 43.99 |
| 11 | 24.81 | 19¾ | 44.55 |
| 11¼ | 25.38 | 20 | 45.12 |
| 111⁄2 | 25.94 |
