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

Find your ring size with our International Conversion Chart

Ring Diameter  (Inside)Ring Circumference  (Inside)International Standard Sizes ›
MMInchesMMInchesBritan & AustraliaUSA & CanadaEuropeGerman/Russian/AsiaIndia/ China/ JapanNetherlands/Swiss
9.90.39031.11.22·0000····
10.70.44233.71.39·00····
11.50.45436.21.43·0····
12.00.47037.51.50A1/2····
12.20.47938.31.51A 1/23/4····
12.40.48738.91.53B1··1·
12.60.50639.61.56B 1/21 1/4····
12.80.50340.21.58C1 1/2····
13.00.51140.81.61C 1/21 3/4····
13.20.52041.51.63D241 1/213 1/221 1/2
13.40.52842.11.66D 1/22 1/4····
13.60.53642.81.68E2 1/242 3/413 3/432 3/4
13.80.54443.51.71E 1/22 3/4····
14.00.55344.11.74F3441444
14.20.55744.51.75F 1/23 1/8····
14.30.56144.81.76F 3/43 1/4····
14.40.56545.11.77G3 3/845 1/4·55 1/4
14.50.56845.41.79G 1/43 1/2·14 1/2··
14.60.57345.71.80G 1/23 5/8··6·
14.70.57646.01.81H3 3/446 1/2··6 1/2
14.90.58546.71.84H 1/24·157·
15.00.59247.31.86I4 1/447 3/4··7 3/4
15.30.60148.01.89I 1/24 1/2·15 1/48·
15.40.60648.41.90J4 5/85015 1/2·9
15.50.61148.81.92J 1/44 3/4····
15.70.61850.31.94J 1/25·15 3/49·
15.80.62250.61.95K5 1/850··10
15.90.62550.01.97K 1/45 1/4····
16.00.63050.31.98K 1/25 3/8··10·
16.10.63450.61.99L5 1/251 3/416·11 3/4
16.30.64251.22.02L 1/45 3/4····
16.40.64651.62.03L 1/25 7/8····
16.50.65051.92.04M652 3/416 1/21212 3/4
16.70.65852.52.07M 1/26 1/4····
16.90.66653.22.09N6 1/254171314
17.10.67453.82.12N 1/26 3/4····
17.40.68354.52.15O755 1/417 1/41415 1/4
17.50.68754.82.16O 1/27 1/4····
17.80.69855.82.20P7 1/256 1/217 3/41516 1/2
18.00.70756.52.22P 1/27 3/4····
18.20.71657.12.25Q857 3/4181617 3/4
18.40.72257.72.27Q 1/28 1/4····
18.50.72958.22.29Q 3/48 1/2·18 1/217·
18.60.73358.52.30R8 5/859··19
18.70.73658.72.31R 1/48 3/4····
18.80.74059.12.32R 1/28 7/8····
18.90.74359.32.35R 3/49·1918·
19.10.75260.02.36S9 1/860 1/4··20 1/4
19.20.75760.42.38S 1/49 1/4····
19.30.76060.72.39S 1/29 3/8····
19.40.76461.02.40S 3/49 1/2·19 1/219·
19.50.76861.32.41T9 5/861 1/2··21 1/2
19.60.77261.62.43T 1/49 3/4····
19.80.78162.32.45T 1/210·2020·
20.00.78062.92.48U10 1/462 3/4·2122 3/4
20.20.79563.52.50U 1/210 1/2·20 1/422·
20.30.80063.82.51V10 5/863··23 3/4
20.40.80564.22.53V 1/410 3/4····
20.70.81465.02.56V 1/211·20 3/423·
20.80.81765.22.57W11 1/865··25
20.90.82165.52.58W 1/411 1/4····
20.90.82465.82.59W 1/211 3/8····
21.00.83066.22.61W 3/411 1/2·2124·
21.20.83466.52.62X11 5/866 1/4··26 1/4
21.20.83666.72.63X 1/411 3/4····
21.30.83866.92.64X 1/211 7/8····
21.50.84667.52.66Y1267 1/221 1/42527 1/2
21.70.85468.12.68Y 1/212 1/4····
21.90.86168.82.71Z12 1/268 3/421 3/42628 3/4
22.10.87069.42.73Z +1/212 3/4····
22.30.87970.22.76Z+113·2227·
22.60.89071.02.80Z+1.513.5····
22.70.89371.32.81Z+2·····
22.90.90272.02.83Z+2.5·····
23.00.90872.52.85Z+3·····
23.30.91573.02.87Z+3.5·····
23.50.92473.72.90Z+4·····
23.60.92774.02.91Z+4.5·····
23.90.94075.02.95Z+5·····
24.30.95576.23.00Z+6·····

Ring Size Conversion Table


Ring Size Conversion Table
US / CanadaUK / Australia / South AfricaFranceGermany / Russia / Ukraine / AsiaIndia / China / Japan / South America / Turkey / IsraelItaly / Spain / Netherlands / Switzerland
½A
1B1
1 1/2C
2D41 1/213 1/421 1/2
2 1/4D-½42 1/813 1/2
2 1/2E42 3/413 3/432 3/4
2 3/4E-½43 3/83 3/8
3F441444
3 1/4F-½44 5/814 1/44 5/8
3 1/2G45 1/414 1/255 1/4
3 3/4G-½45 7/814 3/465 7/8
4H46 1/21576 1/2
4 1/4H-½47 1/87 1/8
4 1/2I47 3/415 1/487 3/4
4 3/4J48 3/815 1/28 3/8
5J-½4915 3/499
5 1/4K49 5/8169 5/8
5 1/2K-½50 1/416 1/41010 1/4
5 3/4L50 7/81110 7/8
6L-½51 1/216 1/21211 1/2
6 1/4M52 1/816 3/412 1/8
6 1/2M-½52 3/4171312 3/4
6 3/4N53 3/813 3/8
7O5417 1/41414
7 1/4O-½54 5/817 1/214 5/8
7 1/2P55 1/417 3/41515 1/4
7 3/4P-½55 7/81815 7/8
8Q56 1/2 —1616 1/2
8 1/4Q-½57 1/818 1/417 1/8
8 1/2R57 3/418 1/21717 3/4
8 3/4R-½58 3/818 3/418 3/8
9S59191819
9 1/4S-½59 5/819 1/419 5/8
9 1/260 1/419 1/21920 1/4
9 3/4T60 7/8 —20 7/8
10T-½61 1/2 19 3/42021 1/2
10 1/4U62 1/8202122 1/8
10 1/2U-½62 3/4 —2222 3/4
10 3/4V63 3/820 1/223 3/8
11V-½6420 3/42324
11 1/4W64 5/824 5/8
11 1/2W-½65 1/4212425 1/4
11 3/4X65 7/821 1/425 7/8
12Y66 1/2 21 1/22526 1/2
12 1/4Y-½67 1/827 1/8
12 1/2Z67 3/421 3/42627 3/4
12 3/4Z-½68 3/828 3/8
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