Ring Size Chart

inside diameter (mm)

US, Canada & Mexico

UK, Ireland, AUS & NZ

Italy, Netherlands, Spain & Switzerland

11.63

0

11.84

1/4

12.04

1/2

A

12.24

3/4

A 1/2

12.45

1

B

12.65

1 1/4

B 1/2

12.85

1 1/2

C

0.5

13.06

1 3/4

C 1/2

1

13.26

2

D

1.75

13.46

2 1/4

D 1/2

2.25

13.67

2 1/2

E

3

13.87

2 3/4

E 1/2

3.5

14.07

3

F

4.25

14.27

3 1/4

F 1/2

4.75

14.48

3 1/2

G

5.5

14.68

3 3/4

G 1/2

6

14.88

4

H

6.75

15.09

4 1/4

H 1/2

7.5

15.29

4 1/2

I

8

15.49

4 3/4

J

8.75

15.7

5

J 1/2

9.25

15.9

5 1/4

K

10

16.1

5 1/2

K 1/2

10.5

16.31

5 3/4

L

11.25

16.51

6

L 1/2

11.75

16.71

6 1/4

M

12.5

16.92

6 1/2

M 1/2

13.25

17.12

6 3/4

N

13.75

17.32

7

N 1/2

14.5

17.53

7 1/4

O

15

17.73

7 1/2

O 1/2

15.75

17.93

7 3/4

P

16.25

18.14

8

P 1/2

17

18.34

8 1/4

Q

17.5

18.54

8 1/2

Q 1/2

18.25

18.75

8 3/4

R

19

18.95

9

R 1/2

19.5

19.15

9 1/4

S

20.25

19.35

9 1/2

S 1/2

20.75

19.56

9 3/4

T

21.5

19.76

10

T 1/2

22

19.96

10 1/4

U

22.75

20.17

10 1/2

U 1/2

23.25

20.37

10 3/4

V

24

20.57

11

V 1/2

24.75

20.78

11 1/4

W

25.25

20.98

11 1/2

W 1/2

26

21.18

11 3/4

X

26.5

21.39

12

X 1/2

27.25

21.59

12 1/4

Y

27.75

21.79

12 1/2

Z

28.5

22

12 3/4

Z 1/2

29