Ring Size Equivalence Table

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US

Japan

Britain

Inside Diameter MM / Inchs

2

2

D

13.2 / 0.52

3

4

F

14.1 / 0.55

4

7

H 1/2

14.9 / 0.59

5

9

J 1/2

15.7 / 0.62

6

12

L

16.5 / 0.65

7

14

N

17.4 / 0.68

8

16

P 1/2

18.2 / 0.72

9

18

R 1/2

19.0 / 0.75

10

20

T 1/2

19.8 / 0.78

11

23

V 1/2

20.7 / 0.81

12

25

Y

21.4 / 0.85