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USA Size

Diam. -inch

Diam. in mm

Metric -mm

British

French

German

Japanese

0000

.390

9.91

-

00

.422

10.72

-

0

.454

11.53

-

1/2

.474

11.95

A

3/4

.482

12.18

A 1/2

1

.487

12.37

38.9

B

1

1 1/4

-

12.60

39.6

B 1/2

1 1/2

.503

12.78

40.2

C

1 3/4

-

13.00

40.8

C 1/2

2

.520

13.21

41.5

D

41 1/2

13 1/2

2

2 1/4

-

13.41

42.1

D 1/2

-

-

2 1/2

.536

13.61

42.7

E

42 3/4

13 3/4

3

2 3/4

-

13.83

43.4

E 1/2

-

-

3

.553

14.05

44.0

F

44

14

4

3 1/8

-

14.15

44.3

F 1/2

-

-

3 1/4

-

14.25

44.6

-

-

-

3 3/8

-

14.36

44.9

G

45 1/4

-

5

3 1/2

.569

14.45

45.2

-

-

14 1/2

3 5/8

-

14.56

45.6

G 1/2

-

6

3 3/4

-

14.65

45.9

H

46 1/2

4

.585

14.86

46.5

H 1/2

-

15

7

4 1/4

-

15.04

47.1

I

47 3/4

4 1/2

.601

15.27

47.8

I 1/2

-

15 1/4

8

4 5/8

-

15.40

48.1

J

49

15 1/2

4 3/4

-

15.53

48.4

-

-

5

.618

15.70

49.0

J 1/2

-

15 3/4

9

5 1/8

-

15.80

49.3

K

50

5 1/4

-

15.90

49.6

-

-

5 3/8

-

16.0

50.0

K 1/2

-

10

5 1/2

.634

16.10

50.3

L

51 3/4

16

5 3/4

-

16.30

50.9

-

-

5 7/8

-

16.41

51.3

L 1/2

-

6

.650

16.51

51.5

M

52 3/4

16 1/2

12

6 1/4

-

16.71

52.2

M 1/2

-

6 1/2

.666

16.92

52.8

N

54

17

13

6 3/4

-

17.13

53.4

N 1/2

-

7

.683

17.35

54.0

O

55 1/4

17 1/4

14

7 1/4

-

17.45

54.7

O 1/2

-

7 1/2

.699

17.75

55.3

P

56 1/2

17 3/4

15

7 3/4

-

17.97

55.9

P 1/2

-

8

.716

18.19

56.6

Q

57 3/4

18

16

8 1/4

-

18.35

57.2

Q 1/2

-

8 1/2

.732

18.53

57.8

-

-

18 1/2

17

8 5/8

-

18.61

58.4

R

59

8 3/4

-

18.69

58.4

-

-

8 7/8

-

18.80

59.0

R 1/2

-

9

.748

18.89

59.1

-

-

19

18

9 1/8

-

19.10

59.4

S

60 1/4

9 1/4

-

19.22

59.7

-

-

9 3/8

-

19.31

60.0

S 1/2

-

9 1/2

.764

19.41

60.3

-

-

19 1/2

19

9 5/8

-

19.51

60.6

T

61 1/2

9 3/4

-

19.62

60.9

-

-

10

.781

19.84

61.6

T 1/2

-

20

20

10 1/4

-

20.02

62.2

U

62 3/4

21

10 1/2

.797

20.20

62.8

U 1/2

-

20 1/4

22

10 5/8

-

20.32

63.1

V

63

10 3/4

-

20.44

63.5

-

-

11

.814

20.68

64.1

V 1/2

-

20 3/4

23

11 1/8

-

20.76

64.3

W

65

11 1/4

-

20.85

64.7

-

-

11 3/8

-

20.94

65.0

W 1/2

-

11 1/2

-

21.08

65.3

-

-

21

24

11 5/8

.830

21.18

65.7

X

66 1/4

11 3/4

-

21.24

66.0

-

-

11 7/8

-

21.30

66.3

X 1/2

-

12

.846

21.49

66.6

Y

67 1/2

21 1/4

25

12 1/2

.862

21.89

67.9

Z

68 3/4

21 3/4

26

12 3/4

-

22.10

68.5

Z 1/2

-

13

.879

22.33

69.1

-

-

22

27

Ring Sizing Queries

All rings at Sndgems.com are available in quarter finger sizes from ring size 3 and up. Rings sized 12 and over will require an additional charge. To go back to main ring sizing page click here.

International Ring Sizing Chart

Using the table following the link, you can also find the correct US size if you know your ring size in one of several international ring size systems. While not exact equivalents, the closest comparable size has been provided. Click here.

Eternity Rings Buying Guide: Page 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38.