Ring Sizing Guide and Chart

 Understanding Finger Size Fluctuations

It’s completely normal for your finger size to change slightly throughout the day — in fact, everyone’s does! That’s why a ring that feels perfect one day might feel a little snug or loose the next. Here are some of the main reasons why:

🌡️ Temperature

Warm weather or physical activity can make your fingers swell slightly, while cooler temperatures can cause them to shrink.

💧 Hydration & Salt Intake

Our bodies naturally retain or lose water depending on how much we drink (and how much salt we eat). This can cause subtle changes in finger size.

💪 Activity & Circulation

When you’re exercising, working with your hands, or carrying something heavy, increased blood flow can make your fingers temporarily swell.

🕒 Time of Day

Fingers tend to be a little puffier in the morning due to overnight fluid retention, and usually slim down as the day goes on.

 

Finding the Right Fit

When choosing your ring size, it’s best to measure your finger at a comfortable room temperature, ideally later in the day when your hands are at their “normal” size. The perfect fit should slide over your knuckle with gentle resistance and feel secure while remaining comfortable.

 

 

Inside Diameter

Inside Circumference

Sizes

MM

Inches

MM

Inches

Australian & British

US & Canada

French & Russian

German

Japanese

Swiss

11.95

0.474

37.54

1.49

A

1/2

-

-

-

-

12.18

0.482

38.26

1.51

A 1/2

3/4

-

-

-

-

12.37

0.487

38.86

1.53

B

1

-

-

1

-

12.6

0.496

39.58

1.56

B 1/2

1 1/4

-

-

-

-

12.78

0.503

40.15

1.58

C

1 1/2

-

-

-

-

13

0.512

40.84

1.61

C 1/2

1 3/4

-

-

-

-

13.21

0.52

41.5

1.63

D

2

41 1/2

13 1/2

2

1 1/2

13.41

0.528

42.13

1.66

D 1/2

2 1/4

-

-

-

-

13.61

0.536

42.76

1.68

E

2 1/2

42 3/4

13 3/4

3

2 3/4

13.83

0.544

43.45

1.71

E 1/2

2 3/4

-

-

-

-

14.05

0.553

44.14

1.74

F

3

44

14

4

4

14.15

0.557

44.45

1.75

F 1/2

3 1/8

-

-

-

-

14.25

0.561

44.77

1.76

F 3/4

3 1/4

-

-

-

-

14.36

0.565

45.11

1.77

G

3 3/8

45 1/4

-

5

5 1/4

14.45

0.569

45.4

1.79

G 1/4

3 1/2

-

14 1/2

-

-

14.56

0.573

45.74

1.8

G 1/2

3 5/8

-

-

6

-

14.65

0.577

46.02

1.81

H

3 3/4

46 1/2

-

-

6 1/2

14.86

0.585

46.68

1.84

H 1/2

4

-

15

7

-

15.04

0.592

47.25

1.86

I

4 1/4

47 3/4

-

-

7 3/4

15.27

0.601

47.97

1.89

I 1/2

4 1/2

-

15 1/4

8

-

15.4

0.606

48.38

1.9

J

4 5/8

49

15 1/2

-

9

15.53

0.611

48.79

1.92

J 1/4

4 3/4

-

-

-

-

15.7

0.618

49.32

1.94

J 1/2

5

-

15 3/4

9

-

15.8

0.622

49.64

1.95

K

5 1/8

50

-

-

10

15.9

0.626

49.95

1.97

K 1/4

5 1/4

-

-

-

-

16

0.63

50.27

1.98

K 1/2

5 3/8

-

-

10

-

16.1

0.634

50.58

1.99

L

5 1/2

51 3/4

16

-

11 3/4

16.3

0.642

51.21

2.02

L 1/4

5 3/4

-

-

-

-

16.41

0.646

51.55

2.03

L 1/2

5 7/8

-

-

-

-

16.51

0.65

51.87

2.04

M

6

52 3/4

16 1/2

12

12 3/4

16.71

0.658

52.5

2.07

M 1/2

6 1/4

-

-

-

-

16.92

0.666

53.16

2.09

N

6 1/2

54

17

13

14

17.13

0.674

53.82

2.12

N 1/2

6 3/4

-

-

-

-

17.35

0.683

54.51

2.15

O

7

55 1/4

17 1/4

14

15 1/4

17.45

0.687

54.82

2.16

O 1/2

7 1/4

-

-

-

-

17.75

0.699

55.76

2.2

P

7 1/2

56 1/2

17 3/4

15

16 1/2

17.97

0.707

56.45

2.22

P 1/2

7 3/4

-

-

-

-

18.19

0.716

57.15

2.25

Q

8

57 3/4

18

16

17 3/4

18.35

0.722

57.65

2.27

Q 1/2

8 1/4

-

-

-

-

18.53

0.729

58.21

2.29

Q 3/4

8 1/2

-

18 1/2

17

-

18.61

0.733

58.47

2.3

R

8 5/8

59

-

-

19

18.69

0.736

58.72

2.31

R 1/4

8 3/4

-

-

-

-

18.8

0.74

59.06

2.32

R 1/2

8 7/8

-

-

-

-

18.89

0.748

59.34

2.35

R 3/4

9

-

19

18

-

19.1

0.752

60

2.36

S

9 1/8

60 1/4

-

-

20 1/4

19.22

0.757

60.38

2.38

S 1/4

9 1/4

-

-

-

-

19.31

0.76

60.66

2.39

S 1/2

9 3/8

-

-

-

-

19.41

0.764

60.98

2.4

S 3/4

9 1/2

-

19 1/2

19

-

19.51

0.768

61.29

2.41

T

9 5/8

61 1/2

-

-

21 1/2

19.62

0.772

61.64

2.43

T 1/4

9 3/4

-

-

-

-

19.84

0.781

62.33

2.45

T 1/2

10

-

20

20

-

20.02

0.788

62.89

2.48

U

10 1/4

62 3/4

-

21

22 3/4

20.2

0.797

63.46

2.5

U 1/2

10 1/2

-

20 1/4

22

-

20.32

0.8

63.84

2.51

V

10 5/8

63

-

-

23 3/4

20.44

0.805

64.21

2.53

V 1/4

10 3/4

-

-

-

-

20.68

0.814

64.97

2.56

V 1/2

11

-

20 3/4

23

-

20.76

0.817

65.22

2.57

W

11 1/8

65

-

-

25

20.85

0.821

65.5

2.58

W 1/4

11 1/4

-

-

-

-

20.94

0.824

65.78

2.59

W 1/2

11 3/8

-

-

-

-

21.08

0.83

66.22

2.61

W 3/4

11 1/2

-

21

24

-

21.18

0.834

66.54

2.62

X

11 5/8

66 1/4

-

-

26 1/4

21.24

0.836

66.73

2.63

X 1/4

11 3/4

-

-

-

-

21.3

0.839

66.92

2.64

X 1/2

11 7/8

-

-

-

-

21.49

0.846

67.51

2.66

Y

12

67 1/2

21 1/4

25

27 1/2

21.69

0.854

68.14

2.68

Y 1/2

12 1/4

-

-

-

-

21.89

0.862

68.77

2.71

Z

12 1/2

68 3/4

21 3/4

26

28 3/4

22.1

0.87

69.43

2.73

Z +1/2

12 3/4

-

-

-

-

22.33

0.879

70.15

2.76

Z+1

13

-

22

27

-

22.6

0.89

71

2.8

Z+1.5

13.5

-

-

-

-

22.69

0.893

71.28

2.81

Z+2

-

-

-

-

-

22.92

0.902

72

2.83

Z+2.5

-

-

-

-

-

23.06

0.908

72.45

2.85

Z+3

-

-

-

-

-

23.24

0.915

73.01

2.87

Z+3.5

-

-

-

-

-

23.47

0.924

73.73

2.9

Z+4

-

-

-

-

-

23.55

0.927

73.98

2.91

Z+4.5

-

-

-

-

-

23.87

0.94

74.99

2.95

Z+5

-

-

-

-

-

24.27

0.956

76.25

3

Z+6

-

-

-

-

-