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Phone: 212-730-8446 212-730-8446 | Midtown 5 W 47th Street, NYC 10036

Ring Size Guide

Ring sizing is a fairly straight-forward process, and one of the most commonly used by the bench jeweler. It involves either adding or removing a piece of metal from the shank of a ring to increase or decrease the diameter, or ring size. 2.61mm added to or removed from the shank will change the ring by one full size (US sizes). There are a variety of techniques used to affect the size of a ring.

Want to order a ring sizer prior to your purchase? Shop all traditional ring sizers that jewelers use. RING SIZERS.

United States Standard including Canada Average Diameter in Inches British Equivalent French Equivalent German Equivalent Japanese Equivalent Swiss Equivalent
000 0.39
00 0.422
0 0.454
1/2 A
3/4 A - 1/2
1 0.487 B 1
1 1/4 B - 1/2
1 1/2 0.503 C
1 3/4 C - 1/2
2 0.52 D 41 1/2 13 1/4 2 1 1/2
2 1/4 D - 1/2
2 1/2 0.536 E 42 3/4 13 3/4 3 2 3/4
2 3/4 E - 1/2
3 0.553 F 44 14 4 4
3 1/8 F - 1/2
3 3/8 G 45 1/4 5 5 1/4
3 1/2 0.569 14 1/2
3 5/8 G - 1/2 6
3 3/4 H 46 1/2 6 1/2
4 0.585 H - 1/2 15 7
4 1/4 I 47 3/4 7 3/4
4 1/2 0.601 I - 1/2 15 1/4 8
4 7/8 J 49 9
5 0.618 J - 1/2 15 3/4 9
5 1/8 K 50 10
5 3/8 K - 1/2 10
5 1/2 0.634 L 51 3/4 16 11 3/4
5 7/8 L - 1/2 11
6 0.65 M 52 3/4 16 1/2 12 12 3/4
6 1/4 M - 1/2
6 1/2 0.666 N 54 17 13 14
6 3/4 N - 1/2
7 0.683 O 55 1/4 17 1/4 14 15 1/4
7 1/4 O - 1/2
7 1/2 0.699 P 56 1/2 17 3/4 15 16 1/2
7 3/4 P - 1/2
8 0.716 Q 57 3/4 18 16 17 3/4
8 1/4 Q -1/2
8 1/2 0.732 18 1/2 17
8 5/8 R 59 19
8 7/8 R - 1/2
9 0.748 19 18
9 1/8 S 60 1/4 20 1/4
9 3/8 S - 1/2
9 1/2 0.764 19 1/2 19
9 5/8 T 61 1/2 21 1/2
10 0.781 T - 1/2 20 20
10 1/4 U 62 3/4 21 22 3/4
10 1/2 0.797 U - 1/2 20 1/4 22
10 5/8 V 63 3/4 23 3/4
11 0.814 V - 1/2 20 3/4 23
11 1/8 W 65 25
11 3/8 W - 1/2
11 1/2 0.83 21 24
11 5/8 X 66 1/4 26 1/4
11 7/8 X - 1/2
12 0.846 Y 67 1/2 21 1/4 25 27 1/2
12 1/4 Y - 1/2
12 1/2 0.862 Z 68 3/4 21 3/4 26 28 3/4
12 3/4 Z - 1/2
13 0.879 22 27