Ring Size Guide
How to measure your ring size:
The two simplest ways to gauge your ring size are by either circumference or diameter.
1.
The circumference of a ring measures the length around the circle. To measure: wrap a
narrow strip of paper comfortably around your finger, mark the end, and measure the
distance.
2.
The diameter of a ring measures the distance across the middle inside, which can be used
to gauge your ring size from a ring you are already wearing.
For either measure, you can read off the appropriate sizing standard for UK & Ireland, the
European Union, French, American, Swiss, Japanese or German. Of course when quoting your
ring size please remember to specify which standard you are using. Note also that this sytem can
only only be used as a guide. Your local jeweller is best placed to measure your finger or ring sizes.
More about ring sizing standards:
Standard
European
French
Swiss
UK &
Ireland
Description
Circumference
The most straighforward, the European system of ring sizing, uses
whole sizes equivalent to ring circumference in millimetres.
The European standard in quarter sizes.
Another commonly used variation of the European system:
European minus forty.
mm=EU
mm=FR
mm=CH+40
Starting at C for forty millimetres, the British Standard
(BS6820 or IS8653) uses alphabetic letters for each 1.25mm of mm=(UK*1.25)+36.3
ring circumference with half sizes in between.
Still based on an old American inch (1.02"), the American ring size
American
represents one tenth of an inch in circumference - further divided
in=(US*.102)+1.43
into quarter sizes.
Diameter
Japanese
German
Starting at thirteen millimetres inside diameter the Japanese ring
standards progresses in one third of a millimetre sizes.
The German standard is equivalent to the metric inside diameter in
quarter sizes.
mm=(JP+38)/3
mm=DE
© Royal Claddagh, 2001, http://www.royalcladdagh.com/
Conversion Table
55.75 2.19 O½
56.00 2.20
Diameter2
Circumference/PI
Circumference1
mm
in uk/ie
41.00 1.61
eu
us
fr
ch
mm
in
41
1
13.05 0.51
41¼
1¼
13.13 0.52
41½
1½
13.21 0.52
41¾
1¾
13.29 0.52
42
2
13.37 0.53
42¼
2¼
13.45 0.53
42½
2½
13.53 0.53
42¾
2¾
13.61 0.54
43
3
13.69 0.54
43¼
3¼
13.77 0.54
43½
3½
13.85 0.55
43¾
3¾
13.93 0.55
44
4
14.01 0.55
44.25 1.74
44¼
4¼
14.09 0.55
44.50 1.75 F½
44½
4½
14.16 0.56
44¾
4¾
14.24 0.56
41
41.25 1.62 D
41.50 1.63
2
41.75 1.64
42.00 1.65 D½
42
42.25 1.66
2¼
42.50 1.67 E
42.75 1.68
43.00 1.69
43.25
2½
43
1.7 E½
43.50 1.71
2¾
43.75 1.72 F
44.00 1.73
44
44.75 1.76
45.00 1.77 G
3
3¼
45
45.25 1.78
45.50 1.79
3½
45.75 1.80 G½
46.00 1.81
46
3¾
46.25 1.82 H
46.50 1.83
46.75 1.84
47.00 1.85 H½
4
47
47.25 1.86
45
5
14.32 0.56
45¼
5¼
14.4 0.57
45½
5½
14.48 0.57
45¾
5¾
14.56 0.57
46
6
14.64 0.58
46¼
6¼
14.72 0.58
46½
6½
14.8 0.58
46¾
6¾
14.88 0.59
47
7
14.96 0.59
47¼
7¼
15.04 0.59
47.50 1.87 I
47½
7½
15.12
0.6
47.75 1.88
47¾
7¾
15.2
0.6
48.00 1.89
4¼
48
4½
48.25 1.90 I½
48.50 1.91
48.75 1.92 J
49.00 1.93
4¾
49
49.25 1.94
5
49.50 1.95 J½
49.75 1.96
50.00 1.97 K
50
5¼
50.25 1.98
50.50 1.99
5½
50.75 2.00 K½
51.00 2.01
51
51.25 2.02 L
5¾
51.50 2.03
51.75 2.04
52.00 2.05 L½
6
52
52.25 2.06
52.50 2.07 M
6¼
52.75 2.08
53.00 2.09
53
53.25 2.10 M½
6½
53.50 2.11
53.75 2.12 N
54.00 2.13
6¾
54.25 2.14
7
54.75 2.16
55.00 2.17 O
8
15.28
0.6
8¼
15.36
0.6
48½
8½
15.44 0.61
48¾
8¾
15.52 0.61
49
9
15.6 0.61
49¼
9¼
15.68 0.62
49½
9½
15.76 0.62
49¾
9¾
15.84 0.62
50
10
15.92 0.63
50¼
10¼
16 0.63
50½
10½
16.07 0.63
50¾
10¾
16.15 0.64
51
11
16.23 0.64
51¼
11¼
16.31 0.64
51½
11½
16.39 0.65
51¾
11¾
16.47 0.65
52
12
16.55 0.65
52¼
12¼
16.63 0.65
52½
12½
16.71 0.66
52¾
12¾
16.79 0.66
53
13
16.87 0.66
53¼
13¼
16.95 0.67
53½
13½
17.03 0.67
53¾
13¾
17.11 0.67
54
54
54.50 2.15 N½
48
48¼
14
54¼
14¼
17.27 0.68
54½
14½
17.35 0.68
54¾
14¾
17.43 0.69
15
17.51 0.69
55.25 2.18
55¼
15¼
17.59 0.69
55.50 2.19
55½
15½
17.67
7¼
56.25 2.21 P
de
0.7
56.50 2.22
13¼
2
3
13¾
14
5
14¾
7
15
16
17¾
18.38 0.72
58
18
18.46 0.73
58¼
18¼
18.54 0.73
58.50 2.30
58½
18½
18.62 0.73
58.75 2.31 R
58¾
18¾
18.7 0.74
59
19
18.78 0.74
59¼
19¼
18.86 0.74
59½
19½
18.94 0.75
59¾
19¾
19.02 0.75
60
20
19.1 0.75
8¼
58
58.25 2.29 Q½
59.00 2.32
8½
59
8¾
59.25 2.33
59.75 2.35
60.00 2.36 S
9
60
60¼
20¼
19.18 0.76
60.50 2.38
60½
20½
19.26 0.76
60.75 2.39 S½
60¾
20¾
19.34 0.76
19.42 0.76
2.4
9¼
61
21
61¼
21¼
19.5 0.77
61½
21½
19.58 0.77
61¾
21¾
19.66 0.77
62
22
19.74 0.78
62¼
22¼
19.81 0.78
62.50 2.46 U
62½
22½
19.89 0.78
62.75 2.47
62¾
22¾
19.97 0.79
63
23
20.05 0.79
63¼
23¼
20.13 0.79
63½
23½
20.21
0.8
63¾
23¾
20.29
0.8
20.37
0.8
61
9½
61.25 2.41 T
61.50 2.42
9¾
62.00 2.44 T½
62
62.25 2.45
63.00 2.48
10
63
10¼
10½
63.75 2.51 V
64.00 2.52
64
10¾
64.50 2.54 V½
11
65
65.25 2.57
65.50 2.58
11¼
66.00 2.60
66
11½
66.50 2.62
11
66.75 2.63
67.00 2.64 X½
11¾
67
67.25 2.65
16½
67.50 2.66 Y
16¾
12
67.75 2.67
68.00 2.68
12
17¼
64½
24½
20.53 0.81
64¾
24¾
20.61 0.81
65
25
20.69 0.81
65¼
25¼
20.77 0.82
65½
25½
20.85 0.82
65¾
25¾
20.93 0.82
66
26
21.01 0.83
66¼
26¼
21.09 0.83
66½
26½
21.17 0.83
66¾
26¾
21.25 0.84
67
27
21.33 0.84
67¼
27¼
21.41 0.84
67½
27½
21.49 0.85
67¾
27¾
21.57 0.85
28
21.65 0.85
28¼
21.72 0.86
68.50 2.70
68½
28½
21.8 0.86
68¾
28¾
21.88 0.86
69
29
21.96 0.86
69¼
29¼
22.04 0.87
69.50 2.74 Z½
69½
29½
22.12 0.87
69.75 2.75
69¾
29¾
22.2 0.87
70
30
22.28 0.88
70¼
30¼
22.36 0.88
70½
30½
22.44 0.88
70¾
30¾
22.52 0.89
12½
69
69.25 2.73
70.00 2.76 Z+1
12¼
12¾
70
13
70.50 2.78
17½
20.45 0.81
68
68
70.25 2.77
14
24
24¼
68¼
69.00 2.72
17
64
64¼
68.25 2.69 Y½
68.75 2.71 Z
13
18.06 0.71
57¾
57.75 2.27
66.25 2.61 X
16¼
16¾
18.3 0.72
65.75 2.59 W½
10
56¾
18.22 0.72
65.00 2.56 W
15¾
0.7
17.98 0.71
17½
64.75 2.55
9
17.9
16½
57½
64.25 2.53
15½
16¼
56½
57.50 2.26 Q
63.50 2.50
15¼
56¼
18.14 0.71
63.25 2.49 U½
8
0.7
17
8
61.75 2.43
6
0.7
17.83
17¼
61.00
14½
17.75
16
57
60.25 2.37
14¼
15¾
56
57¼
57
59.50 2.34 R½
4
55¾
57.25 2.25
58.00 2.28
13½
7¾
56.75 2.23
57.00 2.24 P½
17.19 0.68
55
55
jp
7½
56
70.75 2.79 Z+1½
13¼
17¾
16
18
18¼
17
18½
18
18¾
19
19
19¼
20
19½
21
19¾
22
20
20¼
23
20½
24
20¾
25
21
21¼
26
21½
27
21¾
28
22
22¼
29
22½
15
© Royal Claddagh, 2001, http://www.royalcladdagh.com/