Ring Size Chart

Inside Diameter 

Inside Circumference

Sizes

MM

Inches

MM

Inches

British & Australian

 US & Canada

French & Russian

German

Japanese

Swiss

15.70

0.618

49.32

1.94

J 1/2

5

-

15 3/4

9

-

16.10

0.634

50.58

1.99

L

5 1/2

51 3/4

16

-

11 3/4

16.51

0.650

51.87

2.04

M

6

52 3/4

16 1/2

12

12 3/4

16.92

0.666

53.16

2.09

N

6 1/2

54

17

13

14

17.35

0.683

54.51

2.15

O

7

55 1/4

17 1/4

14

15 1/4

17.75

0.699

55.76

2.20

P

7 1/2

56 1/2

17 3/4

15

16 1/2

18.19

0.716

57.15

2.25

Q

8

57 3/4

18

16

17 3/4

18.53

0.729

58.21

2.29

Q 3/4

8 1/2

-

18 1/2

17

-

18.89

0.748

59.34

2.35

R 3/4

9

-

19

18

-

19.41

0.764

60.98

2.40

S 3/4

9 1/2

-

19 1/2

19

-

19.84

0.781

62.33

2.45

T 1/2

10

-

20

20

-

20.20

0.797

63.46

2.50

U 1/2

10 1/2

-

20 1/4

22

-

20.68

0.814

64.97

2.56

V 1/2

11

-

20 3/4

23

-

21.08

0.830

66.22

2.61

W 3/4

11 1/2

-

21

24

-

21.49

0.846

67.51

2.66

Y

12

67 1/2

21 1/4

25

27 1/2

21.89

0.862

68.77

2.71

Z

12 1/2

68 3/4

21 3/4

26

28 3/4

22.33

0.879

70.15

2.76

Z+1

13

-

22

27

-