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| International ring sizes converter |
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US Size
|
Dia. -inch
|
Dia. in MM
|
Metric -MM
|
British
|
French
|
German
|
Japan
|
Swiss
|
|
0000
|
.390
|
9.91
|
|
-
|
|
|
|
|
|
00
|
.422
|
10.72
|
|
-
|
|
|
|
|
|
0
|
.454
|
11.53
|
|
-
|
|
|
|
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|
1/2
|
.474
|
11.95
|
|
A
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3/4
|
.482
|
12.18
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|
A 1/2
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|
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1
|
.487
|
12.37
|
38.9
|
B
|
|
|
1
|
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1 1/4
|
-
|
12.60
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39.6
|
B 1/2
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1 1/2
|
.503
|
12.78
|
40.2
|
C
|
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1 3/4
|
-
|
13.00
|
40.8
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C 1/2
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2
|
.520
|
13.21
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41.5
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D
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41 1/2
|
13 1/2
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2
|
1 1/2
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2 1/4
|
-
|
13.41
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42.1
|
D 1/2
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-
|
-
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|
|
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2 1/2
|
.536
|
13.61
|
42.7
|
E
|
42 3/4
|
13 3/4
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3
|
2 3/4
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|
2 3/4
|
-
|
13.83
|
43.4
|
E 1/2
|
-
|
-
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|
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3
|
.553
|
14.05
|
44.0
|
F
|
44
|
14
|
4
|
4
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3 1/8
|
-
|
14.15
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44.3
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F 1/2
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-
|
-
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3 1/4
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-
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14.25
|
44.6
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-
|
-
|
-
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|
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3 3/8
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-
|
14.36
|
44.9
|
G
|
45 1/4
|
-
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5
|
5 1/4
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3 1/2
|
.569
|
14.45
|
45.2
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-
|
-
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14 1/2
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3 5/8
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-
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14.56
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45.6
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G 1/2
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-
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6
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3 3/4
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-
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14.65
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45.9
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H
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46 1/2
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6 1/2
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4
|
.585
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14.86
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46.5
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H 1/2
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-
|
15
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7
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|
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4 1/4
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-
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15.04
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47.1
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I
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47 3/4
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7 3/4
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4 1/2
|
.601
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15.27
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47.8
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I 1/2
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-
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15 1/4
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8
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4 5/8
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-
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15.40
|
48.1
|
J
|
49
|
15 1/2
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|
9
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4 3/4
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-
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15.53
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48.4
|
-
|
-
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|
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5
|
.618
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15.70
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49.0
|
J 1/2
|
-
|
15 3/4
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9
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5 1/8
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-
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15.80
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49.3
|
K
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50
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|
|
10
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5 1/4
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-
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15.90
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49.6
|
-
|
-
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|
|
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5 3/8
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-
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16.0
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50.0
|
K 1/2
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-
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|
10
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|
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5 1/2
|
.634
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16.10
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50.3
|
L
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51 3/4
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16
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|
11 3/4
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5 3/4
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-
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16.30
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50.9
|
-
|
-
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5 7/8
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-
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16.41
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51.3
|
L 1/2
|
-
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|
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6
|
.650
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16.51
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51.5
|
M
|
52 3/4
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16 1/2
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12
|
12 3/4
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6 1/4
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-
|
16.71
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52.2
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M 1/2
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-
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6 1/2
|
.666
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16.92
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52.8
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N
|
54
|
17
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13
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14
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6 3/4
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-
|
17.13
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53.4
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N 1/2
|
-
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7
|
.683
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17.35
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54.0
|
O
|
55 1/4
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17 1/4
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14
|
15 1/4
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7 1/4
|
-
|
17.45
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54.7
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O 1/2
|
-
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|
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7 1/2
|
.699
|
17.75
|
55.3
|
P
|
56 1/2
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17 3/4
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15
|
16 1/2
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7 3/4
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-
|
17.97
|
55.9
|
P 1/2
|
-
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|
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8
|
.716
|
18.19
|
56.6
|
Q
|
57 3/4
|
18
|
16
|
17 3/4
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|
8 1/4
|
-
|
18.35
|
57.2
|
Q 1/2
|
-
|
|
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|
8 1/2
|
.732
|
18.53
|
57.8
|
-
|
-
|
18 1/2
|
17
|
|
|
8 5/8
|
-
|
18.61
|
58.4
|
R
|
59
|
|
|
19
|
|
8 3/4
|
-
|
18.69
|
58.4
|
-
|
-
|
|
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|
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8 7/8
|
-
|
18.80
|
59.0
|
R 1/2
|
-
|
|
|
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|
9
|
.748
|
18.89
|
59.1
|
-
|
-
|
19
|
18
|
|
|
9 1/8
|
-
|
19.10
|
59.4
|
S
|
60 1/4
|
|
|
20 1/4
|
|
9 1/4
|
-
|
19.22
|
59.7
|
-
|
-
|
|
|
|
|
9 3/8
|
-
|
19.31
|
60.0
|
S 1/2
|
-
|
|
|
|
|
9 1/2
|
.764
|
19.41
|
60.3
|
-
|
-
|
19 1/2
|
19
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|
|
9 5/8
|
-
|
19.51
|
60.6
|
T
|
61 1/2
|
|
|
21 1/2
|
|
9 3/4
|
-
|
19.62
|
60.9
|
-
|
-
|
|
|
|
|
10
|
.781
|
19.84
|
61.6
|
T 1/2
|
-
|
20
|
20
|
|
|
10 1/4
|
-
|
20.02
|
62.2
|
U
|
62 3/4
|
|
21
|
22 3/4
|
|
10 1/2
|
.797
|
20.20
|
62.8
|
U 1/2
|
-
|
20 1/4
|
22
|
|
|
10 5/8
|
-
|
20.32
|
63.1
|
V
|
63
|
|
|
23 3/4
|
|
10 3/4
|
-
|
20.44
|
63.5
|
-
|
-
|
|
|
|
|
11
|
.814
|
20.68
|
64.1
|
V 1/2
|
-
|
20 3/4
|
23
|
|
|
11 1/8
|
-
|
20.76
|
64.3
|
W
|
65
|
|
|
25
|
|
11 1/4
|
-
|
20.85
|
64.7
|
-
|
-
|
|
|
|
|
11 3/8
|
-
|
20.94
|
65.0
|
W 1/2
|
-
|
|
|
|
|
11 1/2
|
-
|
21.08
|
65.3
|
-
|
-
|
21
|
24
|
|
|
11 5/8
|
.830
|
21.18
|
65.7
|
X
|
66 1/4
|
|
|
26 1/4
|
|
11 3/4
|
-
|
21.24
|
66.0
|
-
|
-
|
|
|
|
|
11 7/8
|
-
|
21.30
|
66.3
|
X 1/2
|
-
|
|
|
|
|
12
|
.846
|
21.49
|
66.6
|
Y
|
67 1/2
|
21 1/4
|
25
|
27 1/2
|
|
12 1/4
|
-
|
21.69
|
67.2
|
Y 1/2
|
-
|
|
|
|
|
12 1/2
|
.862
|
21.89
|
67.9
|
Z
|
68 3/4
|
21 3/4
|
26
|
28 3/4
|
|
12 3/4
|
-
|
22.10
|
68.5
|
Z 1/2
|
-
|
|
|
|
|
13
|
.879
|
22.33
|
69.1
|
-
|
-
|
22
|
27
|
|
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