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Ring Size Conversion Chart

Some sizes are approximated. For example, EU size 51 is equivalent to US size 5 5/8. Since we do not have size 5 5/8 on this chart, EU size 51 is approximately converted to US size 5 1/2.

Inside Diameter  Inside Circumference Sizes
MM Inches MM Inches US & Canada UK & Australia EU Japan Hong Kong
9.91 0.390 31.13 1.22 0000 - - - -
10.72 0.442 33.68 1.39 00 - - - -
11.53 0.454 36.22 1.43 0 - - - -
11.95 0.474 37.54 1.49 1/2 A - - -
12.18 0.482 38.26 1.51 3/4 A 1/2 - - -
12.37 0.487 38.86 1.53 1 B - - -
12.60 0.496 39.58 1.56 1 1/4 B 1/2 - - -
12.78 0.503 40.15 1.58 1 1/2 C - - -
13.00 0.512 40.84 1.61 1 3/4 C 1/2 - 1 3
13.21 0.520 41.50 1.63 2 D 42 2 4
13.41 0.528 42.13 1.66 2 1/4 D 1/2 - - -
13.61 0.536 42.76 1.68 2 1/2 E 43 3 5
13.83 0.544 43.45 1.71 2 3/4 E 1/2 - - -
14.05 0.553 44.14 1.74 3 F 44 4 6
14.15 0.557 44.45 1.75 3 1/8 F 1/2 - - -
14.25 0.561 44.77 1.76 3 1/4 F 3/4 45 - -
14.36 0.565 45.11 1.77 3 3/8 G - 5 -
14.45 0.569 45.40 1.79 3 1/2 G 1/4 - - 7
14.56 0.573 45.74 1.80 3 5/8 G 1/2 46 - -
14.65 0.577 46.02 1.81 3 3/4 H - 6 -
14.86 0.585 46.68 1.84 4 H 1/2 47 - 8.5
15.04 0.592 47.25 1.86 4 1/4 I - 7 9
15.27 0.601 47.97 1.89 4 1/2 I 1/2 48 - -
15.40 0.606 48.38 1.90 4 5/8 J - 8 -
15.53 0.611 48.79 1.92 4 3/4 J 1/4 - - 10
15.70 0.618 49.32 1.94 5 J 1/2 49 9 -
15.80 0.622 49.64 1.95 5 1/8 K - - 11
15.90 0.626 49.95 1.97 5 1/4 K 1/4 50 - -
16.00 0.630 50.27 1.98 5 3/8 K 1/2 - 10 -
16.10 0.634 50.58 1.99 5 1/2 L - - 12
16.30 0.642 51.21 2.02 5 3/4 L 1/4 51 11 -
16.41 0.646 51.55 2.03 5 7/8 L 1/2 - - -
16.51 0.650 51.87 2.04 6 M 52 12 13
16.71 0.658 52.50 2.07 6 1/4 M 1/2 - - -
16.92 0.666 53.16 2.09 6 1/2 N 53 13 14
17.13 0.674 53.82 2.12 6 3/4 N 1/2 54 - 15
17.35 0.683 54.51 2.15 7 O - 14 -
17.45 0.687 54.82 2.16 7 1/4 O 1/2 55 - 16
17.75 0.699 55.76 2.20 7 1/2 P 56 15 -
17.97 0.707 56.45 2.22 7 3/4 P 1/2 - - 17
18.19 0.716 57.15 2.25 8 Q 57 16 17.5
18.35 0.722 57.65 2.27 8 1/4 Q 1/2 59 17 -
18.53 0.729 58.21 2.29 8 1/2 Q 3/4 - - 19
18.61 0.733 58.47 2.30 8 5/8 R - - -
18.69 0.736 58.72 2.31 8 3/4 R 1/4 59 18 -
18.80 0.740 59.06 2.32 8 7/8 R 1/2 - - -
18.89 0.748 59.34 2.35 9 R 3/4 - - 20
19.10 0.752 60.00 2.36 9 1/8 S 60 19 -
19.22 0.757 60.38 2.38 9 1/4 S 1/4 - - -
19.31 0.760 60.66 2.39 9 3/8 S 1/2 - - -
19.41 0.764 60.98 2.40 9 1/2 S 3/4 61 20 21
19.51 0.768 61.29 2.41 9 5/8 T - - -
19.62 0.772 61.64 2.43 9 3/4 T 1/4 - 21 -
19.84 0.781 62.33 2.45 10 T 1/2 62 - 22.5
20.02 0.788 62.89 2.48 10 1/4 U 63 22 23
20.20 0.797 63.46 2.50 10 1/2 U 1/2 - - -
20.32 0.800 63.84 2.51 10 5/8 V 64 - -
20.44 0.805 64.21 2.53 10 3/4 V 1/4 - 23 24
20.68 0.814 64.97 2.56 11 V 1/2 - - -
20.76 0.817 65.22 2.57 11 1/8 W 65 24 25
20.85 0.821 65.50 2.58 11 1/4 W 1/4 - - -
20.94 0.824 65.78 2.59 11 3/8 W 1/2 - - -
21.08 0.830 66.22 2.61 11 1/2 W 3/4 66 25 -
21.18 0.834 66.54 2.62 11 5/8 X - - 26
21.24 0.836 66.73 2.63 11 3/4 X 1/4 - - -
21.30 0.839 66.92 2.64 11 7/8 X 1/2 67 26 -
21.49 0.846 67.51 2.66 12 Y - - 27
21.69 0.854 68.14 2.68 12 1/4 Y 1/2 68 27 -
21.89 0.862 68.77 2.71 12 1/2 Z - - 28
22.10 0.870 69.43 2.73 12 3/4 Z +1/2 69 28 -
22.33 0.879 70.15 2.76 13 Z+1 70 29 29.5
22.60 0.890 71.00 2.80 13.5 Z+1.5 - 30 -
22.69 0.893 71.28 2.81 - Z+2 - - -
22.92 0.902 72.00 2.83 - Z+2.5 - - -
23.06 0.908 72.45 2.85 14 Z+3 - 31 -
23.24 0.915 73.01 2.87 - Z+3.5 - - -
23.47 0.924 73.73 2.90 - Z+4 - - -
23.55 0.927 73.98 2.91 14.5 Z+4.5 74 32.5 33
23.87 0.940 74.99 2.95 15 Z+5 75 33.5 34
24.27 0.956 76.25 3.00 - Z+6 - - -


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