INTERNATIONAL RING SIZE CONVERSION CHART

Need to determine your ring size use our Int’l ring size conversion chart table in MM or Inches for different countries.

Size Conversion

Inside Diameter(mm)

Inside Diameter(inch)

USA, Canada, Mexico Ring Size

UK, Ireland, Australia, New Zealand, South Africa Ring Size

Germany, France
Ring Size

Turkey, Spain, Italy
Ring Size

Japan, China, India, South America
Ring Size

15 mm

0.59"

41

H

46.8

6,5

7

15.3 mm

0.60"

4.5

I

48

8

8

15.6 mm

0.62"

5

J

49.3

9,5

9

16.2 mm

0.63"

5.5

K

50.6

10,5

10

16.6 mm

0.65"

6

L

51.9

12

11

16.9 mm

0.67"

6.5

M

53.1

13,5

13

17.2 mm

0.68"

7

N

54.4

14,5

14

17.8 mm

0.70"

7.5

O

55.7

16

15

18.1 mm

0.71"

8

P

57

17

16

18.5 mm

0.73"

8.5

Q

58.3

18,5

17

19,1 mm

0.75"

9

R

59.5

20

18

19.4 mm

0.76"

9.5

S

60.8

21

19

19,7 mm

0.78"

10

T

62.1

22,5

20

20.4 mm

0.79"

10.5

U

63.4

23,5

22

20.7 mm

0.81"

11

V

64.6

25

23

21.0 mm

0.83"

11.5

W

65.9

26

24

21.6 mm

0.84"

12

X

67.2

27,5

25

22.0 mm

0.86"

12.5

Y

68.5

29

26

22.3 mm

0.87"

13

Z

69.7

30

27

22.9 mm

0.89"

13.5

Z+2

71

32

-

23.2 mm

0.91"

14

Z+3

72.3

33

-

23.6 mm

0.92"

14.5

Z+4

73.6

34,5

-

24.0 mm

0.94"

15

Z+5

74.8

35

-

Tip: When measuring your finger, your measurements need to be a 100% accurate as even a fraction of a millimeter can make a difference
Don’t know your Ring Size? Click here to see Video explaining how to measure your Ring Size.
Global Ring Sizing Systems

There are several systems for indicating a rings size used around the world:

In the United States, Canada and Mexico, for indicating a rings size uses a numerical measure, for whole and half rings sizes. An increase of a full ring size is an increase of 0.032 inch (0.8128 mm) in diameter, or roughly 1/10 inch in inside circumference.

In United Kingdom, Australia, New Zealand, South Africa and Ireland, the ring sizes are specified using an alphabetical letters, for full and half ring sizes

In Japan, India, South America and China, ring sizes are specified using a numerical measure, that only has whole size rings, and does not have direct correlation with diameter or circumference.

In Italy, Spain, Netherlands, and Switzerland, ring sizes are specified as the circumference minus 40mm. A 50 ISO was a 10 in Switzerland.

In France and Germany the numbers of each size simply translates to the circumference of the inside of the ring in millimeters. So a size 40 would mean the inside circumference of a ring is also 40 mm.