Once again, measure your feet! Sites like that usually give the length for each size.
Have a look at this chart: https://www.zappos.com/c/measure-your-shoe-size?
My longer foot measures 10 1/2”, so in the women’s chart, that corresponds to size 11. All of my shoes are size 11 and that is spot on. The only problem is that I need a wide or double wide width and most women’s shoes are only available in medium width. However, since I live in the desert, sandals are often a good choice as they tend to have less structure and can be broken in. I have also done resizing with shoe trees, but that works better with real leather compared to synthetic materials. Another way is placing plastic bags of water into a shoe and leaving them in the freezer over night. When frozen, water expands by 4% in volume. The only thing is that the expansion is in every direction, so that may not be helpful if you need resizing in a very specific place.
I tend not to pay much attention to the men’s chart. But, my measurement falls between sizes 9 1/2 and 10. That is exactly correct as all of my men’s shoes are either 9 1/2 or 10.
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