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Measure an Existing Ring
- Select an existing ring that fits the desired finger.
- Measure the internal diameter of the ring (in mm).3.
- Use the below chart to determine your ring size.
| Internal Diameter (mm) |
US/CAN |
UK/AUS |
German |
| 14.1 mm |
3 |
F |
14 |
| 14.5 mm |
3.5 |
G |
14.5 |
| 14.9 mm |
4 |
H 1/2 |
15 |
| 15.3 mm |
4.5 |
I 1/2 |
15.25 |
| 15.7 mm |
5 |
J 1/2 |
15 3/4 |
| 16.1 mm |
5.5 |
K 1/2 |
16 |
| 16.5 mm |
6 |
L 1/2 |
16 1/2 |
| 16.9 mm |
6.5 |
M 1/2 |
16.75 |
| 17.3 mm |
7 |
O |
17 1/4 |
| 17.7 mm |
7.5 |
P |
17.75 |
| 18.1 mm |
8 |
Q |
18 |
| 18.5 mm |
8.5 |
R |
18.5 |
| 19 mm |
9 |
S |
19 |
| 19.4 mm |
9.5 |
T |
19.5 |
| 19.8 mm |
10 |
U |
19 3/4 |
| 20.2 mm |
10.5 |
V |
20.25 |
| 20.6 mm |
11 |
W |
20 1/2 |
| 21.0 mm |
11.5 |
X |
21 |
| 21.4 mm |
12 |
Y |
21 1/2 |
| 21.8 mm |
12.5 |
Z |
22 |
| 22.2 mm |
13 |
Z 1 |
22.25 |
