Ring Size Conversion Chart

British, Irish & Australian

USA & Canada 

Japanese 

Swiss 

J

4 3/4

9

J 1/2

5

9

K

5 1/4

10

K 1/2

5 1/2

10

L

5 3/4

11.75

L 1/2

6

11

12.75

M 

6 1/4

12

M 1/2

6 1/2

13

14

N

6 3/4

N 1/2

7

14

15.25

O 

7 1/4

O 1/2

7 1/2

15

16.5

P 

7 3/4

P 1/2

8

16

17.75

Q 

8 1/4

Q 1/2

8 1/2

17

R

8 3/4

19

R 1/2

9

18

S

9 1/4

20.25

S 1/2

9 1/2

19

T

9 3/4

21.5

T 1/2

10

20

U

10 1/4

21

U 1/2

10 1/2

22

22.75

V

10 3/4

V 1/2

11

23

W

11 1/4

25

W 1/2

11 1/2

24

X

11 3/4

X 1/2

12

25

27.5

Y 

12 1/4

Z

12 1/2

26

28.75

Z 1/2

12 3/4

13

27

Z+1

13 1/4

13 1/2

Z+2

13 3/4

Z+3

14

14 1/4

Z+4

14 1/2