Converting women's shoe sizes to men's shoe sizes varies based upon which conversion chart is used. U.S., European, U.K., Australian, Japanese and the charts of other countries all vary. On the U.S. charts, subtracting 1.5 from the women's shoe size provides the men's shoe size equivalent.
On the European shoe charts, men's and women's sizes coincide with each other. This means that a six in women's is also a six in men's. On U.K. charts, 0.5 is added for the conversion. In Australia, 0.5 is subtracted. The Japanese shoe charts list sizes by centimeters; so the sizes for men and women also coincide.