International Ring Size Conversion Chart


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Inside DiameterInside CircumferenceSizes
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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