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How to Find Ring Size

How do you find out your ring size at home?

In the international standard ISO 8653:2016, every ring size has a corresponding inner diameter, measured in millimeters. The tolerances applicable therein are also in units of millimeters.

To determine your ring size, do the following:
Use a piece of string or dental floss and wrap it around the base of your finger.Wrap the string close to the knuckle.This is the thickest part of your finger, and your ring will need to slide over it comfortably
Use a pen to mark the point on the string where the end meets.
Use a millimeter ruler to measure the string.
Choose the closest measurement to the chart bellow to find your ring size.
Also: If there is no string or dental floss available, masking tape or paper can be used, a wire or a twist-tie can also be used.

Tips for best results:
Allow enough room to accommodate your knuckle.
Bear in mind, different fingers on the same and the opposite hand may have different sizes. Therefore, measure the specific finger on which you are planning to wear the ring.
Measure your finger at the end of the day when your finger is likely to be largest.
Measure in the Evening: Preferably, measure your ring size in the evening (as your fingers are slightly smaller in the early morning, and in cold weather)
Measure Atleast Twice: Measure twice to make sure that you took the correct measurement

Ring
Diameter 

(Inside)
Ring
Circumference

 (Inside)
International
Standard Sizes ›
MM Inches MM Inches Britan &
Australia
USA &
Canada
Europe German/Russian/Asia India/
China/

Japan
Netherlands/Swiss
9.9 0.390 31.1 1.22 · 0000 · · · ·
10.7 0.442 33.7 1.39 · 00 · · · ·
11.5 0.454 36.2 1.43 · 0 · · · ·
12.0 0.470 37.5 1.50 A 1/2 · · · ·
12.2 0.479 38.3 1.51 A 1/2 3/4 · · · ·
12.4 0.487 38.9 1.53 B 1 · · 1 ·
12.6 0.506 39.6 1.56 B 1/2 1 1/4 · · · ·
12.8 0.503 40.2 1.58 C 1 1/2 · · · ·
13.0 0.511 40.8 1.61 C 1/2 1 3/4 · · · ·
13.2 0.520 41.5 1.63 D 2 41 1/2 13 1/2 2 1 1/2
13.4 0.528 42.1 1.66 D 1/2 2 1/4 · · · ·
13.6 0.536 42.8 1.68 E 2 1/2 42 3/4 13 3/4 3 2 3/4
13.8 0.544 43.5 1.71 E 1/2 2 3/4 · · · ·
14.0 0.553 44.1 1.74 F 3 44 14 4 4
14.2 0.557 44.5 1.75 F 1/2 3 1/8 · · · ·
14.3 0.561 44.8 1.76 F 3/4 3 1/4 · · · ·
14.4 0.565 45.1 1.77 G 3 3/8 45 1/4 · 5 5 1/4
14.5 0.568 45.4 1.79 G 1/4 3 1/2 · 14 1/2 · ·
14.6 0.573 45.7 1.80 G 1/2 3 5/8 · · 6 ·
14.7 0.576 46.0 1.81 H 3 3/4 46 1/2 · · 6 1/2
14.9 0.585 46.7 1.84 H 1/2 4 · 15 7 ·
15.0 0.592 47.3 1.86 I 4 1/4 47 3/4 · · 7 3/4
15.3 0.601 48.0 1.89 I 1/2 4 1/2 · 15 1/4 8 ·
15.4 0.606 48.4 1.90 J 4 5/8 50 15 1/2 · 9
15.5 0.611 48.8 1.92 J 1/4 4 3/4 · · · ·
15.7 0.618 50.3 1.94 J 1/2 5 · 15 3/4 9 ·
15.8 0.622 50.6 1.95 K 5 1/8 50 · · 10
15.9 0.625 50.0 1.97 K 1/4 5 1/4 · · · ·
16.0 0.630 50.3 1.98 K 1/2 5 3/8 · · 10 ·
16.1 0.634 50.6 1.99 L 5 1/2 51 3/4 16 · 11 3/4
16.3 0.642 51.2 2.02 L 1/4 5 3/4 · · · ·
16.4 0.646 51.6 2.03 L 1/2 5 7/8 · · · ·
16.5 0.650 51.9 2.04 M 6 52 3/4 16 1/2 12 12 3/4
16.7 0.658 52.5 2.07 M 1/2 6 1/4 · · · ·
16.9 0.666 53.2 2.09 N 6 1/2 54 17 13 14
17.1 0.674 53.8 2.12 N 1/2 6 3/4 · · · ·
17.4 0.683 54.5 2.15 O 7 55 1/4 17 1/4 14 15 1/4
17.5 0.687 54.8 2.16 O 1/2 7 1/4 · · · ·
17.8 0.698 55.8 2.20 P 7 1/2 56 1/2 17 3/4 15 16 1/2
18.0 0.707 56.5 2.22 P 1/2 7 3/4 · · · ·
18.2 0.716 57.1 2.25 Q 8 57 3/4 18 16 17 3/4
18.4 0.722 57.7 2.27 Q 1/2 8 1/4 · · · ·
18.5 0.729 58.2 2.29 Q 3/4 8 1/2 · 18 1/2 17 ·
18.6 0.733 58.5 2.30 R 8 5/8 59 · · 19
18.7 0.736 58.7 2.31 R 1/4 8 3/4 · · · ·
18.8 0.740 59.1 2.32 R 1/2 8 7/8 · · · ·
18.9 0.743 59.3 2.35 R 3/4 9 · 19 18 ·
19.1 0.752 60.0 2.36 S 9 1/8 60 1/4 · · 20 1/4
19.2 0.757 60.4 2.38 S 1/4 9 1/4 · · · ·
19.3 0.760 60.7 2.39 S 1/2 9 3/8 · · · ·
19.4 0.764 61.0 2.40 S 3/4 9 1/2 · 19 1/2 19 ·
19.5 0.768 61.3 2.41 T 9 5/8 61 1/2 · · 21 1/2
19.6 0.772 61.6 2.43 T 1/4 9 3/4 · · · ·
19.8 0.781 62.3 2.45 T 1/2 10 · 20 20 ·
20.0 0.780 62.9 2.48 U 10 1/4 62 3/4 · 21 22 3/4
20.2 0.795 63.5 2.50 U 1/2 10 1/2 · 20 1/4 22 ·
20.3 0.800 63.8 2.51 V 10 5/8 63 · · 23 3/4
20.4 0.805 64.2 2.53 V 1/4 10 3/4 · · · ·
20.7 0.814 65.0 2.56 V 1/2 11 · 20 3/4 23 ·
20.8 0.817 65.2 2.57 W 11 1/8 65 · · 25
20.9 0.821 65.5 2.58 W 1/4 11 1/4 · · · ·
20.9 0.824 65.8 2.59 W 1/2 11 3/8 · · · ·
21.0 0.830 66.2 2.61 W 3/4 11 1/2 · 21 24 ·
21.2 0.834 66.5 2.62 X 11 5/8 66 1/4 · · 26 1/4
21.2 0.836 66.7 2.63 X 1/4 11 3/4 · · · ·
21.3 0.838 66.9 2.64 X 1/2 11 7/8 · · · ·
21.5 0.846 67.5 2.66 Y 12 67 1/2 21 1/4 25 27 1/2
21.7 0.854 68.1 2.68 Y 1/2 12 1/4 · · · ·
21.9 0.861 68.8 2.71 Z 12 1/2 68 3/4 21 3/4 26 28 3/4
22.1 0.870 69.4 2.73 Z +1/2 12 3/4 · · · ·
22.3 0.879 70.2 2.76 Z+1 13 · 22 27 ·
22.6 0.890 71.0 2.80 Z+1.5 13.5 · · · ·
22.7 0.893 71.3 2.81 Z+2 · · · · ·
22.9 0.902 72.0 2.83 Z+2.5 · · · · ·
23.0 0.908 72.5 2.85 Z+3 · · · · ·
23.3 0.915 73.0 2.87 Z+3.5 · · · · ·
23.5 0.924 73.7 2.90 Z+4 · · · · ·
23.6 0.927 74.0 2.91 Z+4.5 · · · · ·
23.9 0.940 75.0 2.95 Z+5 · · · · ·
24.3 0.955 76.2 3.00 Z+6 · · · · ·

Ring
Size Conversion Table

US /
Canada
UK /
Australia / South Africa
France Germany /
Russia / Ukraine / Asia
India /
China / Japan / South America / Turkey / Israel
Italy /
Spain / Netherlands / Switzerland
½ A
1 B 1
1 1/2 C
2 D 41 1/2 13 1/4 2 1 1/2
2 1/4 D-½ 42 1/8 13 1/2
2 1/2 E 42 3/4 13 3/4 3 2 3/4
2 3/4 E-½ 43 3/8 3 3/8
3 F 44 14 4 4
3 1/4 F-½ 44 5/8 14 1/4 4 5/8
3 1/2 G 45 1/4 14 1/2 5 5 1/4
3 3/4 G-½ 45 7/8 14 3/4 6 5 7/8
4 H 46 1/2 15 7 6 1/2
4 1/4 H-½ 47 1/8 7 1/8
4 1/2 I 47 3/4 15 1/4 8 7 3/4
4 3/4 J 48 3/8 15 1/2 8 3/8
5 J-½ 49 15 3/4 9 9
5 1/4 K 49 5/8 16 9 5/8
5 1/2 K-½ 50 1/4 16 1/4 10 10 1/4
5 3/4 L 50 7/8 11 10 7/8
6 L-½ 51 1/2 16 1/2 12 11 1/2
6 1/4 M 52 1/8 16 3/4 12 1/8
6 1/2 M-½ 52 3/4 17 13 12 3/4
6 3/4 N 53 3/8 13 3/8
7 O 54 17 1/4 14 14
7 1/4 O-½ 54 5/8 17 1/2 14 5/8
7 1/2 P 55 1/4 17 3/4 15 15 1/4
7 3/4 P-½ 55 7/8 18 15 7/8
8 Q 56 1/2  — 16 16 1/2
8 1/4 Q-½ 57 1/8 18 1/4 17 1/8
8 1/2 R 57 3/4 18 1/2 17 17 3/4
8 3/4 R-½ 58 3/8 18 3/4 18 3/8
9 S 59 19 18 19
9 1/4 S-½ 59 5/8 19 1/4 19 5/8
9 1/2 60 1/4 19 1/2 19 20 1/4
9 3/4 T 60 7/8  — 20 7/8
10 T-½ 61 1/2  19
3/4
20 21 1/2
10 1/4 U 62 1/8 20 21 22 1/8
10 1/2 U-½ 62 3/4  — 22 22 3/4
10 3/4 V 63 3/8 20 1/2 23 3/8
11 V-½ 64 20 3/4 23 24
11 1/4 W 64 5/8 24 5/8
11 1/2 W-½ 65 1/4 21 24 25 1/4
11 3/4 X 65 7/8 21 1/4 25 7/8
12 Y 66 1/2  21
1/2
25 26 1/2
12 1/4 Y-½ 67 1/8 27 1/8
12 1/2 Z 67 3/4 21 3/4 26 27 3/4
12 3/4 Z-½ 68 3/8 28 3/8
13 69 22 27 29
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