STANDARD REFERENCE CHART FOR RING SIZE CONVERSIONS
US Size |
Diameter | Metric | British | French | German | Japanese | Swiss | |
inch | mm | mm | ||||||
0000 | 0,390 | 9,91 | – | |||||
00 | 0,422 | 10,72 | – | |||||
0 | 0,454 | 11,53 | – | |||||
0,500 | 0,474 | 11,95 | A | |||||
0,750 | 0,482 | 12,18 | A ½ | |||||
1,000 | 0,487 | 12,37 | 38,9 | B | 1 | |||
1,250 | – | 12,60 | 39,6 | B ½ | ||||
1,500 | 0,503 | 12,78 | 40,2 | C | ||||
1,750 | – | 13,00 | 40,8 | C ½ | ||||
2,000 | 0,520 | 13,21 | 41,5 | D | 41 ½ | 13 ½ | 2 | 1 ½ |
2,250 | – | 13,41 | 42,1 | D ½ | – | – | ||
2,500 | 0,536 | 13,61 | 42,7 | E | 42 ¾ | 13 ¾ | 3 | 2 ¾ |
2,750 | – | 13,83 | 43,4 | E ½ | – | – | ||
3,000 | 0,553 | 14,05 | 44,0 | F | 44 | 14 | 4 | 4 |
3,125 | – | 14,15 | 44,3 | F ½ | – | – | ||
3,250 | – | 14,25 | 44,6 | – | – | – | ||
3,375 | – | 14,36 | 44,9 | G | 45 ¼ | – | 5 | 5 ¼ |
3,500 | 0,569 | 14,45 | 45,2 | – | – | 14 ½ | ||
3,625 | – | 14,56 | 45,6 | G ½ | – | – | 6 | |
3,750 | – | 14,65 | 45,9 | H | 46 ½ | – | 6 ½ | |
4,000 | 0,585 | 14,86 | 46,5 | H ½ | – | 15 | 7 | |
4,250 | – | 15,04 | 47,1 | I | 47 ¾ | – | 7 ¾ | |
4,500 | 0,601 | 15,27 | 47,8 | I ½ | – | 15 ¼ | 8 | |
4,625 | – | 15,40 | 48,1 | J | 49 | 15 ½ | 9 | |
4,750 | – | 15,53 | 48,4 | – | – | – | ||
5,000 | 0,618 | 15,70 | 49,0 | J ½ | – | 15 | 9 | |
5,125 | – | 15,80 | 49,3 | K | 50 | – | 10 | |
5,250 | – | 15,90 | 49,6 | – | – | – | ||
5,375 | – | 16,00 | 50,0 | K ½ | – | – | 10 | |
5,500 | 0,634 | 16,10 | 50,3 | L | 51 ¾ | 16 | 11 | 11 ¾ |
5,750 | – | 16,30 | 50,9 | – | – | – | ||
5,875 | – | 16,41 | 51,3 | L ½ | – | – | ||
6,000 | 0,650 | 16,51 | 51,5 | M | 52 ¾ | 16 ½ | 12 | 12 ¾ |
6,250 | – | 16,71 | 52,2 | M ½ | – | – | ||
6,500 | 0,666 | 16,92 | 52,8 | N | 54 | 17 | 13 | 14 |
6,750 | – | 17,13 | 53,4 | N ½ | – | – | ||
7,000 | 0,683 | 17,35 | 54,0 | O | 55 ¼ | 17 ¼ | 14 | 15 ¼ |
7,250 | – | 17,45 | 54,7 | O ½ | – | – | ||
7,500 | 0,699 | 17,75 | 55,3 | P | 56 ½ | 17 ¾ | 15 | 16 ½ |
7,750 | – | 17,97 | 55,9 | P ½ | – | – | ||
8,000 | 0,716 | 18,19 | 56,6 | Q | 57 ¾ | 18 | 16 | 17 ¾ |
8,250 | – | 18,35 | 57,2 | Q ½ | – | – | ||
8,500 | 0,732 | 18,53 | 57,8 | – | – | 18 ½ | 17 | |
8,625 | – | 18,61 | 58,4 | R | 59 | – | 19 | |
8,750 | – | 18,69 | 58,4 | – | – | – | ||
8,875 | – | 18,80 | 59,0 | R ½ | – | – | ||
9,000 | 0,748 | 18,89 | 59,1 | – | – | 19 | 18 | |
9,125 | – | 19,10 | 59,4 | S | 60 ¼ | – | 20 ¼ | |
9,250 | – | 19,22 | 59,7 | – | – | – | ||
9,375 | – | 19,32 | 60,0 | S ½ | – | – | ||
9,500 | 0,764 | 19,41 | 60,3 | – | – | 19 ½ | 19 | |
9,625 | – | 19,51 | 60,6 | T | 61 ½ | – | 21 ½ | |
9,750 | – | 19,62 | 60,9 | – | – | – | ||
10,000 | 0,784 | 19,84 | 61,6 | T ½ | – | 20 | 20 | |
10,250 | – | 20,02 | 62,2 | U | 62 ¾ | – | 21 | 22 ¾ |
10,500 | 0,797 | 20,20 | 62,8 | U ½ | – | 20 ¼ | 22 | |
10,625 | – | 20,32 | 63,1 | V | 63 | – | 23 ¾ | |
10,750 | – | 20,44 | 63,5 | – | – | – | ||
11,000 | 0,814 | 20,68 | 64,1 | V ½ | – | 20 ¾ | 23 | |
11,125 | – | 20,76 | 64,3 | W | 65 | – | 25 | |
11,250 | – | 20,85 | 64,7 | – | – | – | ||
11,375 | – | 20,94 | 65,0 | W ½ | – | – | ||
11,500 | – | 21,08 | 65,3 | – | – | 21 | 24 | |
11,625 | 0,830 | 21,18 | 65,7 | X | 66 ¼ | – | 26 ¼ | |
11,750 | – | 21,24 | 66,0 | – | – | – | ||
11,875 | – | 21,30 | 66,3 | X ½ | – | – | ||
12,000 | 0,846 | 21,49 | 66,6 | Y | 67 ½ | 21 ¼ | 25 | 27 ½ |
12,250 | – | 21,69 | 67,2 | Y ½ | – | – | ||
12,500 | 0,862 | 21,89 | 67,9 | Z | 68 ¾ | 21 ¾ | 26 | 28 ¾ |
12,750 | – | 22,10 | 68,5 | Z ½ | – | – | ||
13,000 | 0,879 | 22,33 | 69,1 | – | – | 22 | 27 |