ring sizing

Conversion Chart

If possible, it’s best to visit a local jeweller to have your ring size measured.

UK Size 

US  Size

Diameter (mm)

Circumference (mm)

B

1

12.37

38.9

B 1/2

1 1/4

12.60

39.6

C

1 1/2

12.78

40.2

C 1/2

1 3/4

13.00

40.8

D

2

13.21

41.5

D 1/2

2 1/4

13.41

42.1

E

2 1/2

13.61

42.7

E 1/2

2 3/4

13.83

43.4

F

3

14.05

44.0

F 1/2

3 1/8

14.15

44.3

 

3 1/4

14.25

44.6

G

3 3/8

14.36

44.9

-

3 1/2

14.45

45.2

G 1/2

3 5/8

14.56

45.6

H

3 3/4

14.65

45.9

H 1/2

4

14.86

46.5

I

4 1/4

15.04

47.1

I 1/2

4 1/2

15.27

47.8

J

4 5/8

15.40

48.1

-

4 3/4

15.53

48.4

J 1/2

5

15.70

49.0

K

5 1/8

15.80

49.3

-

5 1/4

15.90

49.6

K 1/2

5 3/8

16.0

50.0

L

5 1/2

16.10

50.3

-

5 3/4

16.30

50.9

L 1/2

5 7/8

16.41

51.3

M

6

16.51

51.5

M 1/2

6 1/4

16.71

52.2

N

6 1/2

16.92

52.8

N 1/2

6 3/4

17.13

53.4

O

7

17.35

54.0

O 1/2

7 1/4

17.45

54.7

P

7 1/2

17.75

55.3

P 1/2

7 3/4

17.97

55.9

Q

8

18.19

56.6

Q 1/2

8 1/4

18.35

57.2

-

8 1/2

18.53

57.8

R

8 5/8

18.61

58.4

-

8 3/4

18.69

58.4

R 1/2

8 7/8

18.80

59.0

-

9

18.89

59.1

S

9 1/8

19.10

59.4

-

9 1/4

19.22

59.7

S 1/2

9 3/8

19.31

60.0

-

9 1/2

19.41

60.3

T

9 5/8

19.51

60.6

-

9 3/4

19.62

60.9

T 1/2

10

19.84

61.6

U

10 1/4

20.02

62.2

U 1/2

10 1/2

20.20

62.8

V

10 5/8

20.32

63.1

-

10 3/4

20.44

63.5

V 1/2

11

20.68

64.1

W

11 1/8

20.76

64.3

-

11 1/4

20.85

64.7

W 1/2

11 3/8

20.94

65.0

-

11 1/2

21.08

65.3

X

11 5/8

21.18

65.7

-

11 3/4

21.24

66.0

X 1/2

11 7/8

21.30

66.3

Y

12

21.49

66.6

Y 1/2

12 1/4

21.69

67.2

Z

12 1/2

21.89

67.9

Z 1/2

12 3/4

22.10

68.5