Ring Size

Diameter (mm)

Circumference (mm)

1

12.4

38.96

1.5

12.8

40.21

2

13.2

41.47

2.5

13.6

42.73

3

14

43.98

3.5

14.5

45.55

4

14.9

46.81

4.5

15.2

47.75

5

15.6

49.01

5.5

16

50.27

6

16.5

51.84

6.5

16.9

53.09

7

17.2

54.04

7.5

17.6

55.29

8

18

56.55

8.5

18.5

58.12

9

18.9

59.38

9.5

19.3

60.63

10

19.7

61.89

10.5

20.2

63.46

11

20.6

64.72

11.5

21

65.97

12

21.5

67.54

12.5

21.9

68.80

13

22.3

70.06

13.5

22.7

71.31

14

23.1

72.57

14.5

23.5

73.83

15

24

75.40