What is my Ring Size?

Inside Diameter

Outside Diameter

Size

Size

MM

Inches

MM

Inches

Australian & UK

US & Canada

14.05

0.553

44.14

1.74

F

3

14.15

0.557

44.45

1.75

F1/2

3 1/8

14.36

0.565

45.11

1.77

G

3 3/8

14.56

0.573

45.74

1.80

G1/2

3 5/8

14.65

0.577

46.02

7.81

H

3 3/4

14.86

0.585

46.68

1.84

H ½

4

15.04

0.592

47.25

1.86

I

4 ¼

15.27

0.601

47.97

1.89

I ½

4 ½

15.40

0.606

48.38

1.90

J

4 5/8

15.70

0.618

49.32

1.94

J ½

5

15.80

0.622

49.64

1.95

K

5 ¼

16.00

0.630

50.27

1.98

K ½

5 3/8

16.10

0.634

50.58

1.99

L

5 ½

16.41

0.646

51.55

2.03

L ½

5 7/8

16.51

0.650

51.87

2.04

M

6

16.71

0.658

52.50

2.07

M ½

6 ¼

16.92

0.666

53.16

2.09

N

6 ½

17.13

0.674

53.82

2.12

N ½

6 ¾

17.35

0.683

54.51

2.15

O

7

17.45

0.687

54.82

2.16

O ½

7 ¼

17.75

0.699

55.76

2.20

P

7 ½

17.97

0.707

56.45

2.22

P ½

7 ¾

18.19

0.716

57.15

2.25

Q

8

18.35

0.722

57.65

2.27

Q ½

8 ¼

18.61

0.733

58.47

2.30

R

8 5/8

18.80

0.740

59.06

2.32

R ½

8 7/8

19.10

0.752

60.00

2.36

S

9 1/8

19.31

0.760

60.66

2.39

S ½

9 3/8

19.51

0.768

61.29

2.41

T

9 5/8

19.84

0.781

62.33

2.45

T ½

10

20.02

0.788

62.89

2.48

U

10 ¼

20.20

0.797

63.46

2.50

U ½

10 ½

20.32

0.800

63.84

2.51

V

10 5/8

20.68

0.814

64.97

2.56

V ½

11

20.76

0.817

65.22

2.57

W

11 1/8

20.94

0.824

65.78

2.59

W ½

11 3/8

21.18

0.834

66.54

2.62

X

11 5/8

21.30

0.839

66.92

2.64

X ½

11 7/8

21.49

0.846

67.51

2.66

Y

12

21.69

0.854

68.14

2.68

Y ½

12 ¼

21.89

0.862

68.77

2.71

Z

12 ½

22.10

0.870

69.43

2.73

Z ½

12 3/4