Us size 4.5  =Eur size 36 =22.5cm

Us size 5.5  =Eur size 37 =23.5cm

Us size 6     =Eur size 38 =24cm

Us size 6.5  =Eur size 39 =25cm

US size 7    =Eur size 40 =25.5cm

US size 8    =Eur size 41 =26cm 

US size 8.5  =Eur size 42 =26.5cm 

US size 9.5  =Eur size 43 =27.5cm

US size 10   =Eur size 44 =28cm

US size 11   =Eur size 45 =29cm

US size 12   =Eur size 46 =30cm