指輪のサイズ | Ring Size
| 日本（号）
| 内径（mm）
| 内周（mm）
| 国際規格
|
| 1
| 13.0
| 40.8
| 41
|
| 2
| 13.3
| 41.9
| 42
|
| 3
| 13.7
| 42.9
| 43
|
| 4
| 14.0
| 44.0
| 44
|
| 5
| 14.3
| 45.0
| 45
|
| 6
| 14.7
| 46.1
| 46
|
| 7
| 15.0
| 47.1
| 47
|
| 8
| 15.3
| 48.2
| 48
|
| 9
| 15.7
| 49.2
| 49
|
| 10
| 16.0
| 50.3
| 50
|
| 11
| 16.3
| 51.3
| 51
|
| 12
| 16.7
| 52.4
| 52
|
| 13
| 17.0
| 53.4
| 53
|
| 14
| 17.3
| 54.5
| 54
|
| 15
| 17.7
| 55.5
| 55
|
| 16
| 18.0
| 56.6
| 56
|
| 17
| 18.3
| 57.6
| 57
|
| 18
| 18.7
| 58.6
| 58
|
| 19
| 19.0
| 59.7
| 59
|
| 20
| 19.3
| 60.7
| 60
|
| 21
| 19.7
| 61.8
| 61
|
| 22
| 20.0
| 62.8
| 62
|
| 23
| 20.3
| 63.9
| 63
|
| 24
| 20.7
| 64.9
| 64
|
| 25
| 21.0
| 66.0
| 65
|
| 26
| 21.3
| 67.1
| 66
|
| 27
| 21.7
| 68.1
| 67
|
