Measure with an Existing Ring Chart

 INTERNAL DIAMETER (MM) 14.1 14.9 15.7 16.5 17.3 18.1 19.0 19.8 20.6 21.4 22.2
US/CANADA RING SIZE 3 4 5 6 7 8 9 10 11 12 13
UK/AUSTRALIA RING SIZE F H J L N P R T V W Z
GERMAN RING SIZE 14 15 15 3/4 16 1/2 17 1/4 18 19 20 20 3/4 21 1/4 22
INTERNAL DIAMETER (MM) US/CAN RING SIZE UK/AUS RING SIZE GERMAN RING SIZE
14.1 3 F 14
14.9 4 H 15
15.7 5 J 15 3/4
16.5 6 L 16 1/2
17.3 7 N 17 1/4
18.1 8 P 18
19.0 9 R 19
19.8 10 T 20
20.6 11 V 20 1/4
21.4 12 X 21 1/4
22.2 13 Z 22