Take a tape measure and place it at the base of your finger
Wrap it around your finger and mark where the tape ends meet
Refer to the circumference measurement in the chart below and round up to the nearest ring size
US
UK
EUR
JPN
Circumference (MM)
Diameter (MM)
5
J 1/2
49.5
9
49.3
15.7
6
M
52
11
51.9
16.5
7
O
54.5
14
54.4
17.3
8
Q
57
17
57.0
18.4
9
S
59.5
19
57.0
18.9
10
T 1/2
62.5
21
62.1
19.7
product
USD
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