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Ring Size Conversion Chart

Home Ring Size Conversion Chart

Ring Size Conversion Chart

International Ring Size Conversion Chart
Inside Diameter  Inside Circumference Sizes
MM Inches MM Inches British & Australian  US & Canada French & Russian German Japanese Swiss
9.91 0.390 31.13 1.220 – 0000 – – – –
10.72 0.442 33.68 1.390 – 00 – – – –
11.53 0.454 36.22 1.430 – 0 – – – –
11.95 0.474 37.54 1.490 A 1/2 – – – –
12.18 0.482 38.26 1.510 A 1/2 3/4 – – – –
12.37 0.487 38.86 1.530 B 1 – – 1 –
12.60 0.496 39.58 1.560 B 1/2 1-1/4 – – – –
12.78 0.503 40.15 1.580 C 1-1/2 – – – –
13.00 0.512 40.84 1.610 C 1/2 1-3/4 – – – –
13.21 0.520 41.50 1.630 D 2 41-1/2 13-1/2 2 1-1/2
13.41 0.528 42.13 1.660 D 1/2 2-1/4 – – – –
13.61 0.536 42.76 1.680 E 2-1/2 42-3/4 13-3/4 3 2-3/4
13.83 0.544 43.45 1.710 E 1/2 2-3/4 – – – –
14.05 0.553 44.14 1.740 F 3 44 14 4 4
14.15 0.557 44.45 1.750 F 1/2 3-1/8 – – – –
14.25 0.561 44.77 1.760 F 3/4 3-1/4 – – – –
14.36 0.565 45.11 1.770 G 3-3/8 45-1/4 – 5 5-1/4
14.45 0.569 45.40 1.790 G 1/4 3-1/2 – 14-1/2 – –
14.56 0.573 45.74 1.800 G 1/2 3-5/8 – – 6 –
14.65 0.577 46.02 1.810 H 3-3/4 46-1/2 – – 6-1/2
14.86 0.585 46.68 1.840 H 1/2 4 – 15 7 –
15.04 0.592 47.25 1.860 I 4-1/4 47-3/4 – – 7-3/4
15.27 0.601 47.97 1.890 I 1/2 4-1/2 – 15-1/4 8 –
15.40 0.606 48.38 1.900 J 4-5/8 49 15-1/2 – 9
15.53 0.611 48.79 1.920 J 1/4 4-3/4 – – – –
15.70 0.618 49.32 1.940 J 1/2 5 – 15-3/4 9 –
15.80 0.622 49.64 1.950 K 5-1/8 50 – – 10
15.90 0.626 49.95 1.970 K 1/4 5-1/4 – – – –
16.00 0.630 50.27 1.980 K 1/2 5-3/8 – – 10 –
16.10 0.634 50.58 1.990 L 5-1/2 51-3/4 16 – 11-3/4
16.30 0.642 51.21 2.020 L 1/4 5-3/4 – – – –
16.41 0.646 51.55 2.030 L 1/2 4-7/8 – – – –
16.51 0.650 51.87 2.040 M 6 52-3/4 16-1/2 12 12-3/4
16.71 0.658 52.50 2.070 M 1/2 6-1/4 – – – –
16.92 0.666 53.16 2.090 N 6-1/2 54 17 13 14
17.13 0.674 53.82 2.120 N 1/2 6-3/4 – – – –
17.35 0.683 54.51 2.150 O 7 55-1/4 17-1/4 14 15-1/4
17.45 0.687 54.82 2.160 O 1/2 7-1/4 – – – –
17.75 0.699 55.76 2.200 P 7-1/2 56-1/2 17-3/4 15 16-1/2
17.97 0.707 56.45 2.220 P 1/2 7-3/4 – – – –
18.19 0.716 57.15 2.250 Q 8 57-3/4 18 16 17-3/4
18.35 0.722 57.65 2.270 Q 1/2 8-1/4 – – – –
18.53 0.729 58.21 2.290 Q 3/4 8-1/2 – 18-1/2 17 –
18.61 0.733 58.47 2.300 R 8-5/8 59 – – 19
18.69 0.736 58.72 2.310 R 1/4 8-3/4 – – – –
18.80 0.740 59.06 2.320 R 1/2 8-7/8 – – – –
18.89 0.748 59.34 2.350 R 3/4 9 – 19 18 –
19.10 0.752 60.00 2.360 S 9-1/8 60-1/4 – – 20-1/4
19.22 0.757 60.38 2.380 S 1/4 9-1/4 – – – –
19.31 0.760 60.66 2.390 S 1/2 9-3/8 – – – –
19.41 0.764 60.98 2.400 S 3/4 9-1/2 – 19-1/2 19 –
19.51 0.768 61.29 2.410 T 9-5/8 61-1/2 – – 21-1/2
19.62 0.772 61.64 2.430 T 1/4 9-3/4 – – – –
19.84 0.781 62.33 2.450 T 1/2 10 – 20 20 –
20.02 0.788 62.89 2.480 U 10-1/4 62-3/4 – 21 22-3/4
20.20 0.797 63.46 2.500 U 1/2 10-1/2 – 20-1/4 22 –
20.32 0.800 63.84 2.510 V 10-5/8 63 – – 23-3/4
20.44 0.805 64.21 2.530 V 1/4 10-3/4 – – – –
20.68 0.814 64.97 2.560 V 1/2 11 – 20-3/4 23 –
20.76 0.817 65.22 2.570 W 11-1/8 65 – – 25
20.85 0.821 65.50 2.580 W 1/4 11-1/4 – – – –
20.94 0.824 65.78 2.590 W 1/2 11-3/8 – – – –
21.08 0.830 66.22 2.610 W 3/4 11-1/2 – 21 24 –
21.18 0.834 66.54 2.620 X 11-5/8 66-1/4 – – 26-1/4
21.24 0.836 66.73 2.630 X 1/4 11-3/4 – – – –
21.30 0.839 66.92 2.640 X 1/2 11-7/8 – – – –
21.49 0.846 67.51 2.660 Y 12 67-1/2 21-1/4 25 27-1/2
21.69 0.854 68.14 2.680 Y 1/2 12-1/4 – – – –
21.89 0.862 68.77 2.710 Z 12-1/2 68-3/4 21-3/4 26 28-3/4
22.10 0.870 69.43 2.730 Z +1/2 12-3/4 – – – –
22.33 0.879 70.15 2.760 Z+1 13 – 22 27 –
22.60 0.890 71.00 2.800 Z+1.5 13-1/2 – – – –
22.69 0.893 71.28 2.810 Z+2 – – – – –
22.92 0.902 72.00 2.830 Z+2.5 – – – – –
23.06 0.908 72.45 2.850 Z+3 – – – – –
23.24 0.915 73.01 2.870 Z+3.5 – – – – –
23.47 0.924 73.73 2.900 Z+4 – – – – –
23.55 0.927 73.98 2.910 Z+4.5 – – – – –
23.87 0.940 74.99 2.950 Z+5 – – – – –
24.27 0.956 76.25 3.000 Z+6 – – – – –
X