換算表
| フレンチサイズ（Fr） | 外径（mm） | イングリッシュサイズ（E） |
|---|---|---|
| 1 | 0.3 | |
| 0.5 | 00 | |
| 2 | 0.7 | |
| 3 | 1.0 | 0 |
| 4 | 1.3 | |
| 1.5 | 1 | |
| 5 | 1.7 | |
| 6 | 2.0 | 2 |
| 7 | 2.3 | |
| 2.5 | 3 | |
| 8 | 2.7 | |
| 9 | 3.0 | 4 |
| 10 | 3.3 | |
| 3.5 | 5 | |
| 11 | 3.7 | |
| 12 | 4.0 | 6 |
| 13 | 4.3 | |
| 4.5 | 7 | |
| 14 | 4.7 | |
| 15 | 5.0 | 8 |
| 16 | 5.3 | |
| 5.5 | 9 | |
| 17 | 5.7 | |
| 18 | 6.0 | 10 |
| 19 | 6.3 | |
| 6.5 | 11 | |
| 20 | 6.7 | |
| 21 | 7.0 | 12 |
| 22 | 7.3 | |
| 7.5 | 13 | |
| 23 | 7.7 | |
| 24 | 8.0 | 14 |
| 25 | 8.3 | |
| 8.5 | 15 | |
| 26 | 8.7 | |
| 27 | 9.0 | 16 |
| 28 | 9.3 | |
| 9.5 | 17 | |
| 29 | 9.7 | |
| 30 | 10.0 | 18 |
| 31 | 10.3 | |
| 10.5 | 19 | |
| 32 | 10.7 | |
| 33 | 11.0 | 20 |
| 34 | 11.3 | |
| 11.5 | 21 | |
| 35 | 11.7 | |
| 36 | 12.0 | 22 |
| 37 | 12.3 | |
| 12.5 | 23 | |
| 38 | 12.7 | |
| 39 | 13.0 | 24 |
| 40 | 13.3 | |
| 13.5 | 25 | |
| 41 | 13.7 | |
| 42 | 14.0 | 26 |
| 43 | 14.3 | |
| 14.5 | 27 | |
| 44 | 14.7 | |
| 45 | 15.0 | 28 |
| BWG | 外径（mm） |
|---|---|
| 5/0 | 12.70 |
| 4/0 | 11.53 |
| 3/0 | 10.80 |
| 2/0 | 9.653 |
| 0 | 8.636 |
| 1 | 7.620 |
| 2 | 7.214 |
| 3 | 6.579 |
| 4 | 6.045 |
| 5 | 5.588 |
| 6 | 5.166 |
| 7 | 4.572 |
| 8 | 4.191 |
| 9 | 3.759 |
| 10 | 3.404 |
| 11 | 3.048 |
| 12 | 2.769 |
| 13 | 2.413 |
| 14 | 2.108 |
| 15 | 1.829 |
| 16 | 1.651 |
| 17 | 1.473 |
| 18 | 1.245 |
| 19 | 1.067 |
| 20 | 0.8890 |
| 21 | 0.8128 |
| 22 | 0.7112 |
| 23 | 0.6350 |
| 24 | 0.5588 |
| 25 | 0.5080 |
| 26 | 0.4572 |
| 27 | 0.4064 |
| 28 | 0.3556 |
| 29 | 0.3302 |
| 30 | 0.3048 |
| 31 | 0.2540 |
| 32 | 0.2286 |
| 33 | 0.2032 |
| 34 | 0.1778 |
| 35 | 0.1270 |
| 36 | 0.1016 |
