International Ring Size Chart

Circumference(mm)

Diameter(mm)

UK, Europe,& Australia

United States& Canada

CN/SG/JP

HK

Switzerland

44.2

14.1

F

3

4

6

4

44.8

14.3

 

5

 

45.5

14.5

G

 

7.5

 

46.1

14.7

 

6

 

46.8

14.9

H

4

7

9

 

47.4

15.1

 

 

 

48.0

15.3

I

8

10

 

48.7

15.5

J

 

 

 

9

49.3

15.7

5

9

11

 

50.0

15.9

K

 

 

 

10

50.6

16.1

10

12

 

51.2

16.3

L

 

 

 

11¾

51.9

16.5

6

11

13

12¾

52.5

16.7

M

 

12

 

 

53.1

16.9

13

14.5

14

53.8

17.1

N

 

 

 

 

54.4

17.3

7

14

16

15¼

55.1

17.5

O

 

 

 

 

55.7

17.7

15

17

16½

56.3

17.9

P

 

 

 

 

57.0

18.1

8

16

 

17¾

57.2

18.2

 

 

 

18

 

57.6

18.3

Q

 

 

 

 

58.3

18.5

17

19

 

58.9

18.8

R

 

 

 

19

59.5

19.0

9

18

20.5

 

60.2

19.2

S

 

 

 

20¼

60.8

19.4

19

22

 

61.4

19.6

T

 

 

 

21½

62.1

19.8

10

20

23

 

62.7

20.0

U

 

21

 

 

63.4

20.2

10½

22

24

22¾

64.0

20.4

V

 

 

 

 

64.6

20.6

11

23

25

 

65.3

20.8

W

 

 

 

25

65.9

21.0

11½

24

26

 

66.6

21.2

X

 

 

 

 

67.2

21.4

12

25

27.75

27½

67.8

21.6

Y

 

 

 

 

68.5

21.8

Z

12½

26

 

28¾

69.1

22.0

 

 

 

 

69.7

22.2

 

13

27

30

 

70.4

22.4

Z+1

 

 

 

 

71.0

22.6

 

13½

 

 

 

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