International Ring Size Conversion Chart Page 2
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1
265.00
65.3
11¼
20.78
65.27
W
20.69
65.63
65.9
11½
20.98
65.91
W½
20.89
66.25
66.6
11¾
21.18
66.55
X
21.09
66.88
67.2
12
21.39
67.19
X½
21.29
67.50
67.8
12¼
21.59
67.83
Y
21.49
68.13
68.5
12½
21.79
68.47
Y½
21.68
68.75
69.1
12¾
22
69.10
Z
21.88
European Ring size
European countries now use the ISO 8653 Ring Size Standard for jewellery rings. This
standard uses the inner circumference of the ring in mm (i.e. the measurement around
the inside of the ring) as its basis. Some places will use inner diameter (i.e. the distance
from inside of one side of the ring to the inside of the other side of the ring across its
widest point.) rather than inner circumference, but t hese are directly related.
Inner Circumference = π * Inner Diameter. (3.14 16 * Inner Diameter)
ISO 8653 International Ring Size Standard
ISO 8653
issued in 1986 defines ring sizes as being measured by the inner circumference
of the ring in mm, this standard has been taken up by the European Committee for
Standardisation (CEN) as EN 28653. You may well see the standard called BS EN 28653 in
the UK, DS EN 28653 in Germany and prefixed by the local standards organisation codes in
other European countries (e.g. BAS EN 28653 - Bosnia, CSN EN 28653 Czech Republic, LST
EN 28653 - Lithuania)
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