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INTERNATIONAL RING SIZE EQUIVALENT CALCULATOR

USA / CANADA	3 3 3 1/4 3 1/2 3 3/4 4 4 1/4 4 1/2 4 3/4 5 5 1/4 5 1/2 5 3/4 6 6 1/4 6 1/2 6 3/4 7 7 1/4 7 1/2 7 3/4 8 8 1/4 8 1/2 8 3/4 9 9 1/4 9 1/2 9 3/4 10 10 1/4 10 1/2 10 3/4 11 11 1/4 11 1/2 11 3/4 12
British	F F --- G H H 1/2 I I 1/2 --- J 1/2 --- L --- M M 1/2 N N 1/2 O O 1/2 P P 1/2 Q Q 1/2 --- --- R 1/2 --- S 1/2 --- T 1/2 U U 1/2 --- V 1/2 --- W 1/2 --- Y
French	44 44 --- --- 46 1/2 --- 47 3/4 --- --- --- --- 51 3/4 --- 52 3/4 --- 54 --- 55 1/4 --- 56 1/2 --- 57 3/4 --- --- --- --- --- --- --- --- 62 3/4 --- --- --- --- --- --- 67 1/2
German	14 14 --- 14 1/2 --- 15 --- 15 1/2 --- 15 3/4 --- 16 --- 16 1/2 --- 17 --- 17 1/4 --- 17 3/4 --- 18 --- 18 1/2 --- 19 --- 19 1/2 --- 20 --- 20 1/4 --- 20 3/4 --- 21 --- 21 1/4
Japanese	4 4 --- --- --- 7 --- 8 --- 9 --- --- --- 12 --- 13 --- 14 --- 15 --- 16 --- 17 --- 18 --- 19 -- 20 21 22 --- 23 --- 24 --- 25
Swiss	4 4 --- --- 6 1/2 --- 7 3/4 --- ---- --- --- 11 3/4 --- 12 3/4 --- 14 --- 15 1/4 --- 16 1/2 --- 17 3/4 --- --- --- --- --- --- --- --- 22 3/4 --- --- --- --- --- --- 27 1/2
Inside Diameter MM / Inches	14.05 / .553 14.05 / .553 --- 14.45 / .569 --- 14.86 / .585 --- 15.27 / .601 --- 15.70 / .618 --- 16.10 / .634 --- 16.51 / .650 --- 16.92 / .666 --- 17.35 / .683 --- 17.63 / .699 --- 18.19 / .716 --- 18.59 / .732 --- 18.99 / .748 --- 19.41 / .764 --- 19.84 / .781 --- 20.24 / .797 --- 20.68 / .814 --- 21.01 / .830 --- 21.49 / .846
* Please Note That The Comparisons On This Calculator Are Approximate.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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