Size Guide

You can measure the rings using a ring gauge to check the US reference size, or with a ruler. 
Take a ring of the desired size, place it on a flat surface over a ruler, and make sure the inner end of the ring is visible. Measure the inner diameter of the ring, going from one inner end to the other, as shown in the pictures. 
Compare the measured diameter with the conversion table to find the corresponding US size. 

 

Size US

Inside Diameter (mm)

Inside Circumference (mm)

3

14,1

44,2

3,5

14,5

45,5

4

14,9

46,8

4,5

15,3

48

5

15,7

49,3

5,5

16,1

50,6

6

16,5

51,9

6,5

16,9

53,1

7

17,3

54,4

7,5

17,7

55,7

8

18,1

57

8,5

18,5

58

9

18,9

59,5

9,5

19,3

60,8

10

19,7

62,1

10,5

20,1

63,4

11

20,5

64,6

11,5

20,9

65,9

12

21,3

67,2

12,5

21,7

68,5

13

22,1

69,7

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