W                            cm
US6.5-7.5                  15.5-16.5
US8-9                        16.5-17.5
US9.5-10.5                17.5-19
US11-12                    19-20.5
US12.5-13.5              20.5-21

1-2                             22-23
2.5-3.5                       23-24
4-5                             25-26
5.5-6.5                       26-27
7-8                             27-28
8.5-9.5                       28-29
10-11                         29-30