Working life. You may have heard about the cervical screening programme that has been very successful and has significantly reduced the incidence of cervical cancer since it started in 1998.
24.8 cm = size 7. 25.4 cm = size 7.5. 25.7 cm = size 8. 26.0 cm = size 8.5. 26.7 cm = size 9. 27.0 cm = size 9.5. 27.3 cm = size 10. 27.9 cm = size 10.5. Roughly speaking, the shoe size goes up one size for each additional centimeter in length.
I thought it was 1.5 shoe sizes. Men's 9.5 is a women's 8... but you might as well try them on in store. Beware that some shoes are gender specific such as running shoes. Men's and women's feet are different enough to warrant different builds for the same models.