| Size (inches) | Size (mm) | Diameter (mm) | U.S.A. size | Japanese size | British size | German size | Swiss size |
|
1 14/16 |
48 |
15.27 |
4 1/2 |
8 |
I – 1/2 |
15 1/4 |
– |
|
1 15/16 |
49 |
15.70 |
5 |
9 |
J 1/2 |
15 3/4 |
– |
|
2 |
51 |
16.10 |
5 1/2 |
11 |
L |
16 |
11 3/4 |
|
2 1/16 |
52 |
16.51 |
6 |
12 |
M |
16 1/2 |
12 3/4 |
|
2 2/16 |
53 |
16.92 |
6 1/2 |
13 |
N |
17 |
14 |
|
2 3/16 |
55 |
17.35 |
7 |
14 |
O |
17 1/4 |
15 1/4 |
|
2 4/16 |
56 |
17.75 |
7 1/2 |
15 |
P |
17 3/4 |
16 1/2 |
|
2 5/16 |
57 |
18.19 |
8 |
16 |
Q |
18 |
17 3/4 |
|
2 6/16 |
58 |
18.53 |
8 1/2 |
17 |
Q 1/2 |
18 1/2 |
– |
|
2 7/16 |
59 |
18.89 |
9 |
18 |
R 1/2 |
19 |
– |
|
2 8/16 |
61 |
19.41 |
9 1/2 |
19 |
S 1/2 |
19 1/2 |
– |
|
2 9/16 |
62 |
19.84 |
10 |
20 |
T 1/2 |
20 |
– |
|
2 10/16 |
63 |
20.20 |
10 1/2 |
22 |
U 1/2 |
20 1/4 |
– |
|
2 11/16 |
65 |
20.68 |
11 |
23 |
V 1/2 |
20 3/4 |
– |
|
2 12/16 |
66 |
21.08 |
11 1/2 |
24 |
W 1/2 |
21 |
– |
|
2 13/16 |
68 |
21.49 |
12 |
25 |
Y |
21 1/4 |
27 1/2 |
|
2 14/16 |
69 |
21.89 |
12 1/2 |
26 |
Z |
21 3/4 |
28 3/4 |
|
2 15/16 |
70 |
22.33 |
13 |
27 |
– |
22 |
– |
The formulae commonly used for calculating ring sizes are included below. Although all reasonable care is taken by lovebraceletsell.com to present true and accurate ring size conversions, some countries and regions have different interpretations of ring sizing. It always pays to check your true ring size at your local jewelry store before ordering rings to allow for these demographic variations in size interpretation.
Ring size calculator
Diameter = (British Size x 0.4) + 11.50 …. where A=1, B=2, C=3, D=4….. Z=26…. etc
Diameter = (U.S.A. Size x 0.83) + 11.50
Diameter = (Japanese Size / 3) + 12.67
Some European Sizes = Circumference minus 40
The diameter is expressed in millimeters in all instances above.
How to determine your ring size
1.Wrap a piece of string or a strip of paper around your finger.
2.Mark the point where the two ends meet.
3.Measure the string or paper against a ruler to get the circumference of your finger.
4.Divide that by 3.14 to get the diameter of your finger.
5.Look up your ring size using the form above.