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Ring Size



Ring size conversion table


Diameter

(inside mm)

Circumference

(inside mm)

UK, Ireland

Australia

US &

Canada

Japan

Swiss

14.1

44.2

F

3

4

4.00

14.3

44.8

F 1/2

3 1/4

5

5.25

14.5

45.5

G

3 1/2

 

 

14.7

46.1

G 1/2

3 3/4

6

6.50

14.9

46.7

4

7

 

15.1

47.4

H 1/2

4 1/4

 

7.75

15.3

48.0

4 1/2

8

 

15.5

48.7

J

4 3/4

 

9.00

15.7

49.3

J 1/2

5

9

 

15.9

49.9

K

5 1/4

 

10.00

16.1

50.6

K 1/2

5 1/2

10

 

16.3

51.2

L

5 3/4

 

11.75

16.5

51.8

L 1/2

6

11

12.75

16.7

52.5

6 1/4

12

 

16.9

53.1

M 1/2

6 1/2

13

14.00

17.1

53.8

N

6 3/4

 

 

17.3

54.4

N 1/2

7

14

15.25

17.5

55.0

7 1/4

 

 

17.7

55.7

O 1/2

7 1/2

15

16.50

17.9

56.3

7 3/4

 

 

18.1

56.9

P 1/2

8

16

17.75

18.3

57.6

8 1/4

 

 

18.5

58.2

Q 1/2

8 1/2

17

 

18.7

58.9

R

8 3/4

 

19

18.9

59.5

R 1/2

9

18

 

19.2

60.1

S

9 1/4

 

20.25

19.4

60.8

S 1/2

9 1/2

19

 

19.6

61.4

T

9 3/4

 

21.5

19.8

62.1

T 1/2

10

20

 

20.0

62.7

U

10 1/4

21

 

20.2

63.3

U 1/2

10 1/2

22

22.75

20.4

64.0

V

10 3/4

 

 

20.6

64.6

V 1/2

11

23

 

20.8

65.2

W

11 1/4

 

25

21.0

65.9

W 1/2

11 1/2

24

 

21.2

66.5

X

11 3/4

 

 

21.4

67.2

X 1/2

12

25

27.50

21.6

67.8

12 1/4

 

 

21.8

68.4

Z

12 1/2

26

28.75

22.0

69.1

Z 1/2

12 3/4

 

 

22.2

69.7

 

13

27

 

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