Ring Sizing 

Conversion Chart

 

US,Canada

 

4

4.25

4.5

4.75

5

5.25

5.5

5.75

6

6.25

6.5

6.75

7

7.25

7.5

7.75

8

8.25

8.5

8.75

9

9.25

9.5

9.75

10

10.25

10.5

10.75

11

11.25

11.5

11.75

12

12.25

12.5

12.75

13

13.25

13.5

13.75

14

14.25

14.5

14.75

15

15.25

15.5

15.75

16

UK, Australia, Ireland, New Zealand

H

H.5

I

J

J 1/2

K

K 1/2

L

L 1/2

M

M 1/2

N

N 1/2

O

O 1/2

P

P 1/2

Q

Q 1/2

R

R 1/2

S

S 1/2

T

T 1/2

U

U 1/2

V

V 1/2

W

W 1/2

X

X 1/2

Y

Z

Z 1/2

 

Z1

 

Z2

Z3

 

Z4

 

 

 

 

 

 

Japan, India, China, South Africa

7

 

8

 

9

 

10

 

11

12

13

 

14

 

15

 

16

 

17

 

18

 

19

 

20

21

22

 

23

 

24

 

25

 

26

 

27

 

 

 

 

 

 

 

 

 

 

 

 

Spain, Italy, Netherlands, Switzerland

6.75

7.5

8

8.75

9.25

10

10.5

11.25

11.75

12.5

13.25

13.75

14.5

15

15.75

16.25

17

17.5

18.25

19

19.5

20.25

20.75

21.5

22

22.75

23.25

24

24.75

25.25

26

26.5

27.25

27.75

28.5

29

29.75

30.5

31

31.75

32.25

33

33.5

34.25

34.75

35.5

36.25

36.75

37.5

Inside Diameter/Circumference(mm)

 

14.88 & 46.8

15.09 & 47.4

15.29 & 48

15.49 & 48.7

15.7 & 49.3

15.9 & 50

16.1 & 50.6

16.31 & 51.2

16.51 & 51.9

16.71 & 52.5

16.92 & 53.1

17.12 & 53.8

17.32 & 54.4

17.53 & 55.1

17.73 & 55.7

17.93 & 56.3

18.14 & 57

18.34 & 57.6

18.54 & 58.3

18.75 & 58.9

18.95 & 59.5

19.15 & 60.2

19.35 & 60.8

19.56 & 61.4

19.76 & 62.1

19.96 & 62.7

20.17 & 63.4

20.37 & 64

20.57 & 64.6

20.78 & 65.3

20.98 & 65.9

21.18 & 66.6

21.39 & 67.2

21.59 & 67.8

21.79 & 68.5

22 & 69.1

22.2 & 69.7

22.4 & 70.4

22.61 & 71

22.81 & 71.7

23.01 & 72.3

23.22 & 72.9

23.42 & 73.6

23.62 & 74.2

24.23 & 76.1

24.03 & 75.5

24.23 & 76.1

24.43 & 76.8

24.64 & 77.4

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