International Ring Size Chart

European Ring Sizes (ISO)

Diameters (mm)

US/Canada Ring Sizes

UK/Australia Ring Sizes

 Asia Ring Sizes

44.2

14.1

3

F

4

44.8

14.3

F1/2

5

45.5

14.5

3.5

G

46.1

14.7

G1/2

6

46.8

14.9

4

H

7

47.4

15.1

H1/2

48

15.3

4.5

I

8

48.7

15.5

J

49.3

15.7

5

J1/2

9

50

15.9

K

50.6

16.1

5.5

K1/2

10

51.2

16.3

L

51.9

16.5

6

L1/2

52.5

16.7

M

12

53.1

17.1

6.5

M1/2

13

53.8

17.3

N

54.4

17.5

7

N1/2

14

55.1

17.7

O

55.7

17.9

7.5

O1/2

15

56.3

18.1

P

57

18.3

8

P1/2

16

57.6

18.5

Q

58.3

18.8

8.5

Q1/2

17

58.9

19

R

59.5

19.2

9

R1/2

18

60.2

19.4

S

60.8

19.6

9.5

S1/2

19

61.4

19.8

T

62.1

20

10

T1/2

20

62.7

20.2

U

21

63.4

20.4

10.5

U1/2

22

64

20.6

V

64.6

20.8

11

V1/2

23

65.3

21

W

65.9

21.2

11.5

W1/2

24

66.6

21.4

X

67.2

21.6

12

X1/2

25

67.8

21.8

Y

68.5

22

12.5

Z

26

69.1

22.2

Z1/2

69.7

22.4

13

27

70.4

22.6

Z + 1