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Ring Size Equivalents
Millimeters
Centimeters
Meters
Kilometers
Feet
Inches
Yards
Miles
Decameters
Hectometers
Decimeters
=
Decimeters
Hectometers
Decameters
Miles
Yards
Inches
Feet
Kilometers
Meters
Centimeters
Millimeters
MM to Inch
Conversion Table
mm
approx. inches
1mm
1/32"
2mm
1/16"
3mm
3/32"
4mm
1/8"
5mm
3/16"
6mm
Just under 1/4"
7mm
Just over 1/4"
8mm
5/16"
9mm
Just under 3/8"
10mm
Just over 3/8"
11mm
7/16"
12mm
Just under 1/2"
13mm
Just over 1/2"
14mm
9/16"
15mm
Just under 5/8"
16mm
5/8"
17mm
Just under 11/16"
18mm
Just under 3/4"
19mm
Just over 3/4"
20mm
Just under 13/16"
21mm
Just over 13/16"
22mm
Just under 7/8"
23mm
Just over 7/8"
24mm
15/16"
25mm
1"
Ring Size Equivalents
U.S. &
Canada
Inside
Diameter
Inside
Circumference
Great
Britain
France
Germany
Japan
Switzerland
3-1/2
...
...
...
...
14-1/2
...
...
3-3/4
...
...
H
46-1/2
...
6-1/2
6-1/2
4
16 mm
50 mm
H-1/2
...
15
7
...
4-1/4
...
...
I
47-3/4
...
...
7-3/4
4-1/2
...
...
I-1/2
...
15-1/4
8
...
4-3/4
...
J
49
...
...
9
5
17 mm
53 mm
J-1/2
...
15-3/4
9
...
5-1/4
...
...
K
50
...
...
10
5-1/2
...
...
L
51-3/4
16
...
11-3/4
5-3/4
...
...
L-1/2
...
...
11
...
6
17.5 mm
55 mm
M
52-3/4
16-1/2
12
12-3/4
6-1/2
...
...
N
54
17
13
14
7
18 mm
57 mm
O
55-1/4
17-1/4
14
15-1/4
7-1/2
...
...
P
56-1/2
17-3/4
15
16-1/2
8
19 mm
60 mm
Q
57-3/4
18
16
17-3/4
8-1/2
...
...
...
...
18-1/2
17
...
8-3/4
...
...
R
59
...
...
19
9
20 mm
63 mm
...
...
19
18
...
9-1/4
...
...
S
60-1/4
...
...
20-1/4
9-1/2
...
...
...
...
19-1/2
19
...
9-3/4
...
...
T
61-1/2
...
...
21-1/2
10
21 mm
66 mm
T-1/2
...
20
20
...
10-1/4
...
...
U
62-3/4
...
21
22-3/4
10-1/2
...
...
U-1/2
...
20-1/4
22
...
10-3/4
...
...
V
63-3/4
...
...
23-3/4
11
21.5 mm
68 mm
V-1/2
...
20-3/4
23
...
11-1/4
...
...
W
65
...
...
25
11-1/2
...
...
...
...
21
24
...
11-3/4
...
...
X
66-1/4
...
...
26-1/4
12
22.5 mm
71 mm
Y
67-1/2
21-1/4
25
27-1/2
12-1/2
...
...
Z
68-3/4
21-3/4
26
28-3/4
13
23 mm
73 mm
...
...
22
27
...
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