Ring Size Conversion

I get a lot of questions from folks that want to know how to convert from American ring sizes to British, European, Australian, etc. Finally I have an answer! For a quick conversion try this    Ring Conversion Tool 

International Ring Size Chart

United States and Canada Ring Size

Diameter in Inches

Great Britain

France

Germany

Japan

Switzerland

000

0.390

00

0.422

0

0.454

½

0.462

A

¾

0.471

A-½

1

0.487

B

1

1 1/4

0.495

B-½

1 1/2

0.503

C

1 3/4

0.511

C-½

2

0.520

D

41 1/2

13 1/4

2

1 1/2

2 1/4

0.528

D-½

42 1/8

13 1/2

2 1/2

0.536

E

42 3/4

13 3/4

3

2 3/4

2 3/4

0.544

E-½

43 3/8

3 3/8

3

0.553

F

44

14

4

4

3 1/4

0.561

F-½

44 5/8

14 1/4

4 5/8

3 1/2

0.569

G

45 1/4

14 1/2

5

5 1/4

3 3/4

0.577

G-½

45 7/8

14 3/4

6

5 7/8

4

0.586

H-½

46 1/2

15

7

6 1/2

4 1/4

0.594

I

47 1/8

15 1/4

7 1/8

4 1/2

0.602

I-½

47 3/4

15 1/2

8

7 3/4

4 3/4

0.610

J

48 3/8

8 3/8

5

0.619

J-½

49

15 3/4

9

9

5 1/4

0.627

K

49 5/8

16

9 5/8

5 1/2

0.635

K-½

50 1/4

16 1/4

10

10 1/4

5 3/4

0.643

L

50 7/8

11

10 7/8

6

0.652

L-½

51 1/2

16 1/2

12

11 1/2

6 1/4

0.660

M

52 1/8

16 3/4

12 1/8

6 1/2

0.668

M-½

52 3/4

17

13

12 3/4

6 3/4

0.676

N

53 3/8

13 3/8

7

0.685

O

54

17 1/4

14

14

7 1/4

0.693

O-½

54 5/8

17 1/2

14 5/8

7 1/2

0.701

P

55 1/4

17 3/4

15

15 1/4

7 3/4

0.709

P-½

55 7/8

15 7/8

8

0.717

Q

56 1/2

18

16

16 1/2

8 1/4

0.726

Q-½

57 1/8

18 1/4

17 1/8

8 1/2

0.734

R

57 3/4

18 1/2

17

17 3/4

8 3/4

0.742

R-½

58 3/8

18 3/4

18 3/8

9

0.750

S

59

19

18

19

9 1/4

0.759

S-½

59 5/8

19 1/4

19 5/8

9 1/2

0.767

60 1/4

19 1/2

19

20 1/4

9 3/4

0.775

T

60 7/8

19 3/4

20 7/8

10

0.783

T-½

61 1/2

20

20

21 1/2

10 1/4

0.792

U

62 1/8

20 1/4

21

22 1/8

10 1/2

0.800

U-½

62 3/4

20 1/2

22

22 3/4

10 3/4

0.808

V

63 3/8

23 3/8

11

0.816

V-½

64

20 3/4

23

24

11 1/4

0.825

W

64 5/8

24 5/8

11 1/2

0.833

W-½

65 1/4

21

24

25 1/4

11 3/4

0.841

X

65 7/8

25 7/8

12

0.849

Y

66 1/2

21 1/4

25

26 1/2

12 1/4

0.858

Y-½

67 1/8

21 1/2

27 1/8

12 1/2

0.866

Z

67 3/4

21 3/4

26

27 3/4

12 3/4

0.874

Z-½

68 3/8

28 3/8

13

0.882

69

22

27

29

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