This table should help when trying to convert different ring sizes.

The following information will show you how to measure your ring size to ensure the ring you purchase is the actual ring size necessary.

Here are our suggestions on how to measure yourself

1. Using a string or piece of paper complete a circle around the bottom of your finger.
2. Using a pen mark the string or paper at the circles connection point.
3. Measure the length of the string/paper from the top till the pen mark.
4. With this measurement refer to the table below to determine your ring size.
Please note: You need to take the knuckle into consideration when sizing. In some cases the bottom of your finger may be smaller than your knuckle. Also take into consideration your knuckle size when purchasing a ring with a wider band which should be sized 1 size larger.

When ordering a products, please take note of the following format

Size 11 (V½- 66.4mm)

The first value after the size number (in the example: 11) is the US system.
The second value, inside the brackets (in the example: V½) is the UK and Australian system.
The third value, inside the brackets (in the example: 66.4mm) is the universal metric system.

Table below is copied from Wikipedia

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

China,
Japan,
South America

India

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

1

0.522

13.26

1.64

41.7

2

D

2

2

1.75

0.53

13.46

1.67

42.3

2.25

0.538

13.67

1.69

42.9

E

3

3

3

0.546

13.87

1.72

43.6

4

3.5

0.554

14.07

1.74

44.2

3

F

4

4.25

0.562

14.27

1.77

44.8

5

5

4.75

0.57

14.48

1.79

45.5

G

5.5

0.578

14.68

1.82

46.1

6

6

6

0.586

14.88

1.84

46.8

4

H

7

6.75

0.594

15.09

1.87

47.4

7

7.5

0.602

15.29

1.89

48

I

8

8

8

0.61

15.49

1.92

48.7

J

9

8.75

0.618

15.7

1.94

49.3

5

9

9.25

0.626

15.9

1.97

50

K

10

10

0.634

16.1

1.99

50.6

10

10.5

0.642

16.31

2.02

51.2

L

11

11.25

0.65

16.51

2.04

51.9

6

11

12

11.75

0.658

16.71

2.07

52.5

M

12

12.5

0.666

16.92

2.09

53.1

13

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

14.5

0.69

17.53

2.17

55.1

O

15

15

0.698

17.73

2.19

55.7

15

15.75

0.706

17.93

2.22

56.3

P

16

16.25

0.714

18.14

2.24

57

8

16

17

17

0.722

18.34

2.27

57.6

Q

17.5

0.73

18.54

2.29

58.3

17

18

18.25

0.738

18.75

2.32

58.9

R

19

19

0.746

18.95

2.34

59.5

9

18

19.5

0.754

19.15

2.37

60.2

S

20

20.25

0.762

19.35

2.39

60.8

19

21

20.75

0.77

19.56

2.42

61.4

T

21.5

0.778

19.76

2.44

62.1

10

20

22

22

0.786

19.96

2.47

62.7

10¼

U

21

23

22.75

0.794

20.17

2.49

63.4

10½

22

23.25

0.802

20.37

2.52

64

10¾

V

24

24

0.81

20.57

2.54

64.6

11

23

25

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

26

0.834

21.18

2.62

66.6

11¾

X

26.5

0.842

21.39

2.65

67.2

12

25

27

27.25

0.85

21.59

2.67

67.8

12¼

Y

28

27.75

0.858

21.79

2.7

68.5

12½

Z

26

28.5

0.866

22

2.72

69.1

12¾

29

29

0.874

22.2

2.75

69.7

13

27

30

29.75

0.882

22.4

2.77

70.4

13¼

Z1

30.5

0.89

22.61

2.8

71

13½

31

31

0.898

22.81

2.82

71.7

13¾

Z2

32

31.75

0.906

23.01

2.85

72.3

14

Z3

32.25

0.914

23.22

2.87

72.9

14¼

33

33

0.922

23.42

2.9

73.6

14½

Z4

33.5

0.93

23.62

2.92

74.2

14¾

34

34.25

0.938

23.83

2.95

74.8

15

35

34.75

0.946

24.03

2.97

75.5

15¼

35.5

0.954

24.23

3

76.1

15½

36

36.25

0.962

24.43

3.02

76.8

15¾

36.75

0.97

24.64

3.05

77.4

16

37

37.5

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