Ring Size Comparison Chart


US Standard (Also  Canada)Diameter in InchesBritish EquivalentFrench EquivalentGerman EquivalentSwiss EquivalentJapanese Equivalent
0.454
1/2A
1.487B1
1 1/2.503C
2.520D41 ½13 ¼1 ½2
2 1/2.536E42 ¾13 ¾2 ¾3
3.553F441444
3 3/8G45 ½5 ½5
3 1/2.56914 ½
3 3/4H46 ½6 ½
4.585H ½157
4 1/4I47 ¾7 ¾
4 7/8J499
5.618J ½15 ¾9
5 1/8K5010
5 1/2.634L51 ¾1611 ¾
6.650M52 ¾16 ½12 ¾12
6 1/2.666N54171413
7.683O55 ¼17 ¼15 ¼14
7 1/4.699P56 ½17 ¾16 ½15
8.716Q57 ¾1817 ¾16
8 1/2.73218 ½17
8 5/8R5919
9.7481918
9 1/8S60 ¼20 ¼
9 1/4.76419 ½19
9 5/8T61 ½21 ½
10.781T ½2020
10 1/4U62 ¾22 ¾21
10 1/2.797U ½20 ¼22
10 5/8V63 ¾23 ¾
11.814V ½20 ¾23
11 1/8W6525
11 1/2.8302124
11 5/8X66 ¼26 ¼
12.846Y67 ½21 ¼27 ½25
12 1/2.862Z68 ¾21 ¾28 ¾26
13.8792227

Ring Size Comparison Chart

Compliments of The International Gem Society