Ring size chart for Japan, America, Europe and the UK

Ring sizes from each country are summarized in a correspondence table using approximate values.

Ring inner diameter (mm)

 Japan America Europe UK
13 1 1 41 C
13.4 2 2 42 D
13.7 3 2.5 43 E
14.1 4 3 44 F 1/2
14.3 5

45

 G
14.5 3 1/2

G1/2
14.7 6 46

H
14.9 7 4 47 H 1/2
15.1 I
15.3 8 4 1/2 48 I 1/2
15.5 J
15.7 9 5 49 J 1/2
15.9 50 K
16.1 10 5 1/2 K 1/2
16.3 51 L
16.5 11 6 52 L 1/2
16.7 12 M
16.9 13 6 1/2 53 M 1/2
17.1 N
17.3 14 7 54 N 1/2
17.7 15 7 1/2 55 O
18 16 8 56 P
18.4 17 8.5 57 Q
18.7 18 9 58 R
19 19 9.5 59 S
19.4 20 10 60 T