Ring sizes

Here is the list of ring sizes and international equivalents.

Ring size is important thing while buying semi mounting, diamond ring, diamond engagement ring or any other ring. You can find large and most affordable selection of rings for sale available from Alpha Imports NY inc.

United States Standard (Including Canada) Average Diameter in Inches British Equivalent French Equivalent German Equivalent Japanese Equivalent Swiss Equivalent
2 0.520 D 41 1/2 13 1/4 2 1 1/2
2 1/4 0.528 D-½ 42 1/8 13 1/2 —
2 1/2 0.536 E 42 3/4 13 3/4 3 2 3/4
2 3/4 0.544 E-½ 43 3/8 — 3 3/8
3 0.553 F 44 14 4 4
3 1/4 0.561 F-½ 44 5/8 14 1/4 4 5/8
3 1/2 0.569 G 45 1/4 14 1/2 5 5 1/4
3 3/4 0.577 G-½ 45 7/8 14 3/4 6 5 7/8
4 0.586 H-½ 46 1/2 15 7 6 1/2
4 1/4 0.594 I 47 1/8 15 1/4 — 7 1/8
4 1/2 0.602 I-½ 47 3/4 15 1/2 8 7 3/4
4 3/4 0.610 J 48 3/8 — — 8 3/8
5 0.619 J-½ 49 15 3/4 9 9
5 1/4 0.627 K 49 5/8 16 — 9 5/8
5 1/2 0.635 K-½ 50 1/4 16 1/4 10 10 1/4
5 3/4 0.643 L 50 7/8 — 11 10 7/8
6 0.652 L-½ 51 1/2 16 1/2 12 11 1/2
6 1/4 0.660 M 52 1/8 16 3/4 12 1/8
6 1/2 0.668 M-½ 52 3/4 17 13 12 3/4
6 3/4 0.676 N 53 3/8 — — 13 3/8
7 0.685 O 54 17 1/4 14 14
7 1/4 0.693 O-½ 54 5/8 17 1/2 14 5/8
7 1/2 0.701 P 55 1/4 17 3/4 15 15 1/4
7 3/4 0.709 P-½ 55 7/8 — 15 7/8
8 0.717 Q 56 1/2 18 16 16 1/2
8 1/4 0.726 Q-½ 57 1/8 18 1/4 17 1/8
8 1/2 0.734 R 57 3/4 18 1/2 17 17 3/4
8 3/4 0.742 R-½ 58 3/8 18 3/4 18 3/8
9 0.750 S 59 19 18 19
9 1/4 0.759 S-½ 59 5/8 19 1/4 19 5/8
9 1/2 0.767 — 60 1/4 19 1/2 19 20 1/4
9 3/4 0.775 T 60 7/8 19 3/4 20 7/8
10 0.783 T-½ 61 1/2 20 20 21 1/2
10 1/4 0.792 U 62 1/8 20 1/4 21 22 1/8
10 1/2 0.800 U-½ 62 3/4 20 1/2 22 22 3/4
10 3/4 0.808 V 63 3/8 — 23 3/8
11 0.816 V-½ 64 20 3/4 23 24
11 1/4 0.825 W 64 5/8 — 24 5/8
11 1/2 0.833 W-½ 65 1/4 21 24 25 1/4
11 3/4 0.841 X 65 7/8 — 25 7/8
12 0.849 Y 66 1/2 21 1/4 25 26 1/2
12 1/4 0.858 Y-½ 67 1/8 21 1/2 27 1/8
12 1/2 0.866 Z 67 3/4 21 3/4 26 27 3/4
12 3/4 0.874 Z-½ 68 3/8 — 28 3/8
13 0.882 — 69 22 27 29

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