International Ring Size Guide

Ring sizes vary around the world. In the UK and Australia, ring sizes are denoted using letters and numbers. The US and Canada use numerical values that are different from those used in France and Russia, which tend to be higher. German sizes are similar to French and Russian but adjusted to match their specific sizing standards. Japanese ring sizes use a numerical scale that directly corresponds to the circumference of the ring in millimeters. Swiss sizes are typically a numerical value indicating the circumference minus 10 mm.

To find the correct size, it is often recommended to visit a local jeweler for a professional measurement. Alternatively, many international sizing guides and tools are available online that can assist with converting one country's sizing standards to another, ensuring the right fit when purchasing rings from international sources.

Inner DiameterInner CircumferenceSize
mmInchesmmInchesBritish & AustralianUS & CanadaFrench & RussianGermanJapaneseSwiss
9.910.39031.131.22-0000----
10.720.44233.681.39-00----
11.530.45436.221.43-0----
11.950.47437.541.49A1/2----
12.180.48238.261.51A 1/23/4----
12.370.48738.861.53B1--1-
12.600.49639.581.56B 1/21 1/4----
12.780.50340.151.58C1 1/2----
13.000.51240.841.61C 1/21 3/4----
13.210.52041.501.63D241 1/213 1/221 1/2
13.410.52842.131.66D 1/22 1/4----
13.610.53642.761.68E2 1/242 3/413 3/432 3/4
13.830.54443.451.71E 1/22 3/4----
14.050.55344.141.74F3441444
14.150.55744.451.75F 1/23 1/8----
14.250.56144.771.76F 3/43 1/4----
14.360.56545.111.77G3 3/845 1/4-55 1/4
14.450.56945.401.79G 1/43 1/2-14 1/2--
14.560.57345.741.80G 1/23 5/8--6-
14.650.57746.021.81H3 3/446 1/2--6 1/2
14.860.58546.681.84H 1/24-157-
15.040.59247.251.86I4 1/447 3/4--7 3/4
15.270.60147.971.89I 1/24 1/2-15 1/48-
15.400.60648.381.90J4 5/84915 1/2-9
15.530.61148.791.92J 1/44 3/4----
15.700.61849.321.94J 1/25-15 3/49-
15.800.62249.641.95K5 1/850--10
15.900.62649.951.97K 1/45 1/4----
16.000.63050.271.98K 1/25 3/8--10-
16.100.63450.581.99L5 1/251 3/416-11 3/4
16.300.64251.212.02L 1/45 3/4----
16.410.64651.552.03L 1/25 7/8----
16.510.65051.872.04M652 3/416 1/21212 3/4
16.710.65852.502.07M 1/26 1/4----
16.920.66653.162.09N6 1/254171314
17.130.67453.822.12N 1/26 3/4----
17.350.68354.512.15O755 1/417 1/41415 1/4
17.450.68754.822.16O 1/27 1/4----
17.750.69955.762.20P7 1/256 1/217 3/41516 1/2
17.970.70756.452.22P 1/27 3/4----
18.190.71657.152.25Q857 3/4181617 3/4
18.350.72257.652.27Q 1/28 1/4----
18.530.72958.212.29Q 3/48 1/2-18 1/217-
18.610.73358.472.30R8 5/859--19
18.690.73658.722.31R 1/48 3/4----
18.800.74059.062.32R 1/28 7/8----
18.890.74859.342.35R 3/49-1918-
19.100.75260.002.36S9 1/860 1/4--20 1/4
19.220.75760.382.38S 1/49 1/4----
19.310.76060.662.39S 1/29 3/8----
19.410.76460.982.40S 3/49 1/2-19 1/219-
19.510.76861.292.41T9 5/861 1/2--21 1/2
19.620.77261.642.43T 1/49 3/4----
19.840.78162.332.45T 1/210-2020-
20.020.78862.892.48U10 1/462 3/4-2122 3/4
20.200.79763.462.50U 1/210 1/2-20 1/422-
20.320.80063.842.51V10 5/863--23 3/4
20.440.80564.212.53V 1/410 3/4----
20.680.81464.972.56V 1/211-20 3/423-
20.760.81765.222.57W11 1/865--25
20.850.82165.502.58W 1/411 1/4----
20.940.82465.782.59W 1/211 3/8----
21.080.83066.222.61W 3/411 1/2-2124-
21.180.83466.542.62X11 5/866 1/4--26 1/4
21.240.83666.732.63X 1/411 3/4----
21.300.83966.922.64X 1/211 7/8----
21.490.84667.512.66Y1267 1/221 1/42527 1/2
21.690.85468.142.68Y 1/212 1/4----
21.890.86268.772.71Z12 1/268 3/421 3/42628 3/4
22.100.87069.432.73Z +1/212 3/4----
22.330.87970.152.76Z+113-2227-
22.600.89071.002.80Z+1.513.5----
22.690.89371.282.81Z+2-----
22.920.90272.002.83Z+2.5-----
23.060.90872.452.85Z+3-----
23.240.91573.012.87Z+3.5-----
23.470.92473.732.90Z+4-----
23.550.92773.982.91Z+4.5-----
23.870.94074.992.95Z+5-----
24.270.95676.253.00Z+6-----
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