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Jewelopedia

Is it very difficult for you to determine the accurate ring size?

Here, given below are various methods of determining the accurate size of your ring.
For accurate sizing, place a ring that fits you over the circle, making sure the inside of the ring lines up with the outside of the circle.

Another option is…
Print this page and cut out the ring sizer image provided here. Wrap the ring sizer around your finger with numbers facing out. When you have found a perfect fit, note the ring size number that appears at the end of the triangle.

The following chart shows conversion of local standard to the USA ring sizes.

Wrap a piece of string or a strip of paper around the finger, mark the ends and measure it against a ruler.  Compare this with the length of a chart.

USA  Size

Diam. -inch

Diam. in mm

Metric -mm

British 

French 

German 

Japanese 

Swiss 

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

1 1/2

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

2 3/4

-

13.83

43.4

E 1/2

-

-

 

 

3

.553

14.05

44.0

F

44

14

4

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

5 1/4

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

 

 

6 1/2

4

.585

14.86

46.5

H 1/2

-

15

7

 

4 1/4

-

15.04

47.1

I 

47 3/4

 

 

7 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

 

9

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

 

 

10

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

 

11 3/4

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

12 3/4

6 1/4

-

16.71

52.2

M 1/2

-

 

 

 

6 1/2

.666

16.92

52.8

N

54

17

13

14

6 3/4

-

17.13

53.4

N 1/2

-

 

 

 

7

.683

17.35

54.0

O

55 1/4

17 1/4

14

15 1/4

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

16 1/2

7 3/4

-

17.97

55.9

P 1/2

-

 

 

 

8

.716

18.19

56.6

Q

57 3/4

18

16

17 3/4

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

 

 

19

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

 

 

20 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

 

 

21 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

22 3/4

10 1/2

.797

20.20

62.8

U 1/2

-

20 1/4

22

 

10 5/8

-

20.32

63.1

V

63

 

 

23 3/4

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

 

 

25

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

 

 

26 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

27 1/2

12 1/2

.862

21.89

67.9

Z

68 3/4

21 3/4

26

28 3/4

12 3/4

-

22.10

68.5

Z 1/2

-

 

 

 

13

.879

22.33

69.1

-

-

22

27

 

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