homesupportcontactsitemapsearch   

 

 

 


 

 

Home >> Site Support >> International Ring Sizes >> Go Back

 

International Ring Sizes:

 

Jeweler's MandrelAt Opal-Trader.com we measure the size of all our rings with an industry standard jeweler's mandrel. The charts below convert the actual ring size (Size mm) into some of the popular internationally recognized sizes. If you cannot find a size in the charts that you are familiar with, please contact us.

 

 

Size (inches)

Size (mm)

Diameter (mm)

U.S.A. size

Japanese size

British size

German size

Swiss size

1 14/16

48

15.27

4 1/2

8

I - 1/2

15 1/4

--

1 15/16

49

15.70

5

9

J 1/2

15 3/4

--

2

51

16.10

5 1/2

11

L

16

11 3/4

2 1/16

52

16.51

6

12

M

16 1/2

12 3/4

2 2/16

53

16.92

6 1/2

13

N

17

14

2 3/16

55

17.35

7

14

O

17 1/4

15 1/4

2 4/16

56

17.75

7 1/2

15

P

17 3/4

16 1/2

2 5/16

57

18.19

8

16

Q

18

17 3/4

2 6/16

58

18.53

8 1/2

17

Q 1/2

18 1/2

--

2 7/16

59

18.89

9

18

R 1/2

19

--

2 8/16

61

19.41

9 1/2

19

S 1/2

19 1/2

--

2 9/16

62

19.84

10

20

T 1/2

20

--

2 10/16

63

20.20

10 1/2

22

U 1/2

20 1/4

--

2 11/16

65

20.68

11

23

V 1/2

20 3/4

--

2 12/16

66

21.08

11 1/2

24

W 1/2

21

--

2 13/16

68

21.49

12

25

Y

21 1/4

27 1/2

2 14/16

69

21.89

12 1/2

26

Z

21 3/4

28 3/4

2 15/16

70

22.33

13

27

--

22

--

 

 

 

Size (inches)

Size (mm)

Diameter (mm)

U.S.A. size

Australian size

Italian size

French size

 

1 14/16

48

15.27

4 1/2

I 1/2

8

--

 

1 15/16

49

15.70

5

J 1/2

9.5

--

 

2

51

16.10

5 1/2

L

10.5

51 3/4

 

2 1/16

52

16.51

6

M

11.5

52 3/4

 

2 2/16

53

16.92

6 1/2

N

13

54

 

2 3/16

55

17.35

7

O

14.5

55 1/4

 

2 4/16

56

17.75

7 1/2

P

16

56 1/2

 

2 5/16

57

18.19

8

Q

17

57 3/4

 

2 6/16

58

18.53

8 1/2

Q 1/2

18.5

58

 

2 7/16

59

18.89

9

R 1/2

19.5

59 1/4

 

2 8/16

61

19.41

9 1/2

S 1/2

21

60 1/2

 

2 9/16

62

19.84

10

T 1/2

22

61 3/4

 

2 10/16

63

20.20

10 1/2

U 1/2

23.5

62 3/4

 

2 11/16

65

20.68

11

V 1/2

25

64 1/4

 

2 12/16

66

21.08

11 1/2

W 1/2

26.5

66

 

2 13/16

68

21.49

12

Y

27.5

67 1/2

 

2 14/16

69

21.89

12 1/2

Z

28.5

68 3/4

 

2 15/16

70

22.33

13

--

30

--

 

 

The formulae commonly used for calculating ring sizes are included below. Although all reasonable care is taken by Opal-Trader.com to present true and accurate ring size conversions, some countries and regions have different interpretations of ring sizing. It always pays to check your true ring size at your local jewelry store before ordering rings to allow for these demographic variations in size interpretation.

 

Ring size calculator

Diameter = (British Size x 0.4) + 11.50 .... where A=1, B=2, C=3, D=4..... Z=26.... etc
Diameter = (U.S.A. Size x 0.83) + 11.50
Diameter = (Japanese Size / 3) + 12.67

Some European Sizes = Circumference minus 40


The diameter is expressed in millimeters in all instances above.

 

View the entire range of Opal Jewelry at Opal-Trader.com

 

 

 

 

 

 

 

 

© Opal-Trader.com™ | Terms | Privacy | Last updated:11/1/2014