Ring Size Conversion Chart

Inside Diameter (mm) Europe USA UK/AUS/NZ
15.3 48 4.5 I
15.6 50 5 J
16.2 52 5.5 K
16.6 53 6 L
16.9 54 6.5 M
17.2 55 7 N
17.8 56 7.5 O
18.1 57 8 P
18.5 58 8.5 Q
19.1 59 9 R
19.4 60 9.5 S
19.7 61 10 T
20.4 62 10.5 U