Inside
diameter

Inside
Circumference

Sizes

(mm)

(mm)

United States
and Canada

United Kingdom,
Ireland,
Australia,
and New Zealand

China,
Japan

Switzerland

11.63

36.5

0

11.84

37.2

¼

12.04

37.8

½

A

12.24

38.5

¾

12.45

39.1

1

B

1

12.65

39.7

12.85

40.4

C

13.06

41.0

13.26

41.7

2

D

2

1.5

13.46

42.3

13.67

42.9

E

3

2.75

13.87

43.6

14.07

44.2

3

F

4

4

14.27

44.8

5

5.25

14.48

45.5

G

14.68

46.1

6

6.5

14.88

46.8

4

H

7

15.09

47.4

7.75

15.29

48.0

I

8

15.49

48.7

J

9

15.70

49.3

5

9

15.90

50.0

K

10

16.10

50.6

10

16.31

51.2

L

11.75

16.51

51.9

6

11

12.75

16.71

52.5

M

12

16.92

53.1

13

14

17.12

53.8

N

17.32

54.4

7

14

15.25

17.53

55.1

O

17.73

55.7

15

16.5

17.93

56.3

P

18.14

57.0

8

16

17.75

18.34

57.6

Q

18.54

58.3

17

18.75

58.9

R

19

18.95

59.5

9

18

19.15

60.2

S

20.25

19.35

60.8

19

19.56

61.4

T

21.5

19.76

62.1

10

20

19.96

62.7

10¼

U

21

20.17

63.4

10½

22

22.75

20.37

64.0

10¾

V

20.57

64.6

11

23

20.78

65.3

11¼

W

25

20.98

65.9

11½

24

21.18

66.6

11¾

X

21.39

67.2

12

25

27.5

21.59

67.8

12¼

Y

21.79

68.5

12½

Z

26

28.75

22.00

69.1

12¾

22.20

69.7

13

27

22.40

70.4

13¼

Z1

22.61

71.0

13½

22.81

71.7

13¾

Z2

23.01

72.3

14

Z3

23.22

72.9

14¼

23.42

73.6

14½

Z4

23.62

74.2

14¾

23.83

74.8

15

24.03

75.5

15¼

24.23

76.1

15½

24.43

76.8

15¾

24.64

77.4

16

Ring Size Chart

United States & Canada
Inside diameter
Inside Circumference Sizes
(mm) (mm) United States and Canada
11.63 36.5 0
11.84 37.2 ¼
12.04 37.8 ½
12.24 38.5 ¾
12.45 39.1 1
12.65 39.7
12.85 40.4
13.06 41
13.26 41.7 2
13.46 42.3
13.67 42.9
13.87 43.6
14.07 44.2 3
14.27 44.8
14.48 45.5
14.68 46.1
14.88 46.8 4
15.09 47.4
15.29 48
15.49 48.7
15.7 49.3 5
15.9 50
16.1 50.6
16.31 51.2
16.51 51.9 6
16.71 52.5
16.92 53.1
17.12 53.8
17.32 54.4 7
17.53 55.1
17.73 55.7
17.93 56.3
18.14 57 8
18.34 57.6
18.54 58.3
18.75 58.9
18.95 59.5 9
19.15 60.2
19.35 60.8
19.56 61.4
19.76 62.1 10
19.96 62.7 10¼
20.17 63.4 10½
20.37 64 10¾
20.57 64.6 11
20.78 65.3 11¼
20.98 65.9 11½
21.18 66.6 11¾
21.39 67.2 12
21.59 67.8 12¼
21.79 68.5 12½
22 69.1 12¾
22.2 69.7 13
22.4 70.4 13¼
22.61 71 13½
22.81 71.7 13¾
23.01 72.3 14
23.22 72.9 14¼
23.42 73.6 14½
23.62 74.2 14¾
23.83 74.8 15
24.03 75.5 15¼
24.23 76.1 15½
24.43 76.8 15¾
24.64 77.4 16
United Kingdom & Others
Inside diameter
Inside Circumference Sizes
(mm) (mm) United Kingdom, Ireland, Australia, and New Zealand
11.63 36.5
11.84 37.2
12.04 37.8 A
12.24 38.5
12.45 39.1 B
12.65 39.7
12.85 40.4 C
13.06 41
13.26 41.7 D
13.46 42.3
13.67 42.9 E
13.87 43.6
14.07 44.2 F
14.27 44.8
14.48 45.5 G
14.68 46.1
14.88 46.8 H
15.09 47.4
15.29 48 I
15.49 48.7 J
15.7 49.3
15.9 50 K
16.1 50.6
16.31 51.2 L
16.51 51.9
16.71 52.5 M
16.92 53.1
17.12 53.8 N
17.32 54.4
17.53 55.1 O
17.73 55.7
17.93 56.3 P
18.14 57
18.34 57.6 Q
18.54 58.3
18.75 58.9 R
18.95 59.5
19.15 60.2 S
19.35 60.8
19.56 61.4 T
19.76 62.1
19.96 62.7 U
20.17 63.4
20.37 64 V
20.57 64.6
20.78 65.3 W
20.98 65.9
21.18 66.6 X
21.39 67.2
21.59 67.8 Y
21.79 68.5 Z
22 69.1
22.2 69.7
22.4 70.4 Z1
22.61 71
22.81 71.7 Z2
23.01 72.3 Z3
23.22 72.9
23.42 73.6 Z4
23.62 74.2
23.83 74.8
24.03 75.5
24.23 76.1
24.43 76.8
24.64 77.4
China & Japan
Inside diameter
Inside Circumference Sizes
(mm) (mm) China, Japan
11.63 36.5
11.84 37.2
12.04 37.8
12.24 38.5
12.45 39.1 1
12.65 39.7
12.85 40.4
13.06 41
13.26 41.7 2
13.46 42.3
13.67 42.9 3
13.87 43.6
14.07 44.2 4
14.27 44.8 5
14.48 45.5
14.68 46.1 6
14.88 46.8 7
15.09 47.4
15.29 48 8
15.49 48.7
15.7 49.3 9
15.9 50
16.1 50.6 10
16.31 51.2
16.51 51.9 11
16.71 52.5 12
16.92 53.1 13
17.12 53.8
17.32 54.4 14
17.53 55.1
17.73 55.7 15
17.93 56.3
18.14 57 16
18.34 57.6
18.54 58.3 17
18.75 58.9
18.95 59.5 18
19.15 60.2
19.35 60.8 19
19.56 61.4
19.76 62.1 20
19.96 62.7 21
20.17 63.4 22
20.37 64
20.57 64.6 23
20.78 65.3
20.98 65.9 24
21.18 66.6
21.39 67.2 25
21.59 67.8
21.79 68.5 26
22 69.1
22.2 69.7 27
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
23.83 74.8
24.03 75.5
24.23 76.1
24.43 76.8
24.64 77.4
Switzerand
Inside diameter
Inside Circumference Sizes
(mm) (mm) Switzerland
11.63 36.5
11.84 37.2
12.04 37.8
12.24 38.5
12.45 39.1
12.65 39.7
12.85 40.4
13.06 41
13.26 41.7 1.5
13.46 42.3
13.67 42.9 2.75
13.87 43.6
14.07 44.2 4
14.27 44.8 5.25
14.48 45.5
14.68 46.1 6.5
14.88 46.8
15.09 47.4 7.75
15.29 48
15.49 48.7 9
15.7 49.3
15.9 50 10
16.1 50.6
16.31 51.2 11.75
16.51 51.9 12.75
16.71 52.5
16.92 53.1 14
17.12 53.8
17.32 54.4 15.25
17.53 55.1
17.73 55.7 16.5
17.93 56.3
18.14 57 17.75
18.34 57.6
18.54 58.3
18.75 58.9 19
18.95 59.5
19.15 60.2 20.25
19.35 60.8
19.56 61.4 21.5
19.76 62.1
19.96 62.7
20.17 63.4 22.75
20.37 64
20.57 64.6
20.78 65.3 25
20.98 65.9
21.18 66.6
21.39 67.2 27.5
21.59 67.8
21.79 68.5 28.75
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
23.83 74.8
24.03 75.5
24.23 76.1
24.43 76.8
24.64 77.4

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