9 Womens shoes are approx. 2 sizes bigger than mens. So if a man has size 7 shoes, then a womans would be size 9. I wear mens shoes size 10, but my church shoes and cowboy boots are size 12...
Go to http://www.misshighheel.com/sizechart.html it has a chart! How cool!
In the UK a 7 is a 7 men's or women's. Men's will just be a bit wider.
I believe that a "Size 7 Mens" = a "Size 9 Women."
Women's would be 1 1/2 bigger than men's so... 11 1/2 is your size in women's if your men's is 10.