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The best way to take the size of your finger
is to measure the inside diameter of a ring that fits your finger well.

The measure has to be taken if possible with a precision caliper,
and must be expressed in millimeters.



Tenths of millimeters are also very important:
for example number 15 on the European scale
corresponds to an inside diameter of 17.4 mm.

For the measure refer to the following table:

SIZES

INSIDE DIAMETER MM. EUROPEAN FRENCH USA UK
14.6 mm. 06 46 3.75 H
14.9 mm. 07 47 4.25 I
15.2 mm. 08 48 4.50 I-1/2
15.6 mm. 09 49 4.75 J
15.9 mm. 10 50 5.25 K
16.2 mm. 11 51 5.75 L-1/2
16.5 mm. 12 52 6.25 M-1/4
16.8 mm. 13 53 6.50 N
17.1 mm. 14 54 6.75 N-3/4
17.4 mm. 15 55 7.25 O-1/4
17.8 mm. 16 56 7.50 P
18.0 mm. 17 57 8.00 Q
18.4 mm. 18 58 8.25 Q-1/2
18.6 mm. 19 59 8.75 R
19.0 mm. 20 60 9.25 S-1/4
19.4 mm. 21 61 9.50 S-3/4
19.6 mm. 22 62 10.00 T-1/2
20.0 mm. 23 63 10.25 U-1/4
20.4 mm. 24 64 10.75 V
20.7 mm. 25 65 11.00 W
20.9 mm. 26 66 11.25 X
21.2 mm. 27 67 11.75 X-3/4
21.6 mm. 28 68 12.25 Y-1/2
21.9 mm. 29 69 12.75 Z
22.2 mm. 30 70 13.25 Z-3/4

 
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