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Ring Size Chart

Conversion chart for ring sizes

Inside diameter

Inside circumference

Sizes

(in)

(mm)

(in)

(mm)

United States
and Canada

United Kingdom,
Ireland,
Australia and
New Zealand

India,
China,
Japan,
South America

Italy,
Spain,
Netherlands,
Switzerland

0.458

11.63

1.44

36.5

0

     

0.466

11.84

1.46

37.2

¼

     

0.474

12.04

1.49

37.8

½

A

   

0.482

12.24

1.51

38.5

¾

   

0.49

12.45

1.54

39.1

1

B

1

 

0.498

12.65

1.56

39.7

   

0.506

12.85

1.59

40.4

C

 

0.5

0.514

13.06

1.61

41

 

1

0.522

13.26

1.64

41.7

2

D

2

1.75

0.53

13.46

1.67

42.3

 

2.25

0.538

13.67

1.69

42.9

E

3

3

0.546

13.87

1.72

43.6

 

3.5

0.554

14.07

1.74

44.2

3

F

4

4.25

0.562

14.27

1.77

44.8

5

4.75

0.57

14.48

1.79

45.5

G

 

5.5

0.578

14.68

1.82

46.1

6

6

0.586

14.88

1.84

46.8

4

H

7

6.75

0.594

15.09

1.87

47.4

 

7.5

0.602

15.29

1.89

48

I

8

8

0.61

15.49

1.92

48.7

J

 

8.75

0.618

15.7

1.94

49.3

5

9

9.25

0.626

15.9

1.97

50

K

 

10

0.634

16.1

1.99

50.6

10

10.5

0.642

16.31

2.02

51.2

L

 

11.25

0.65

16.51

2.04

51.9

6

11

11.75

0.658

16.71

2.07

52.5

M

12

12.5

0.666

16.92

2.09

53.1

13

13.25

0.674

17.12

2.12

53.8

N

 

13.75

0.682

17.32

2.14

54.4

7

14

14.5

0.69

17.53

2.17

55.1

O

 

15

0.698

17.73

2.19

55.7

15

15.75

0.706

17.93

2.22

56.3

P

 

16.25

0.714

18.14

2.24

57

8

16

17

0.722

18.34

2.27

57.6

Q

 

17.5

0.73

18.54

2.29

58.3

17

18.25

0.738

18.75

2.32

58.9

R

 

19

0.746

18.95

2.34

59.5

9

18

19.5

0.754

19.15

2.37

60.2

S

 

20.25

0.762

19.35

2.39

60.8

19

20.75

0.77

19.56

2.42

61.4

T

 

21.5

0.778

19.76

2.44

62.1

10

20

22

0.786

19.96

2.47

62.7

10¼

U

21

22.75

0.794

20.17

2.49

63.4

10½

22

23.25

0.802

20.37

2.52

64

10¾

V

 

24

0.81

20.57

2.54

64.6

11

23

24.75

0.818

20.78

2.57

65.3

11¼

W

 

25.25

0.826

20.98

2.59

65.9

11½

24

26

0.834

21.18

2.62

66.6

11¾

X

 

26.5

0.842

21.39

2.65

67.2

12

25

27.25

0.85

21.59

2.67

67.8

12¼

Y

 

27.75

0.858

21.79

2.7

68.5

12½

Z

26

28.5

0.866

22

2.72

69.1

12¾

 

29

0.874

22.2

2.75

69.7

13

 

27

29.75

0.882

22.4

2.77

70.4

13¼

Z1

 

30.5

0.89

22.61

2.8

71

13½

   

31

0.898

22.81

2.82

71.7

13¾

Z2

 

31.75

0.906

23.01

2.85

72.3

14

Z3

 

32.25

0.914

23.22

2.87

72.9

14¼

   

33

0.922

23.42

2.9

73.6

14½

Z4

 

33.5

0.93

23.62

2.92

74.2

14¾

   

34.25

0.938

23.83

2.95

74.8

15

   

34.75

0.946

24.03

2.97

75.5

15¼

   

35.5

0.954

24.23

3

76.1

15½

   

36.25

0.962

24.43

3.02

76.8

15¾

   

36.75

0.97

24.64

3.05

77.4

16

   

37.5