While shopping for shoes can be fun, making sure you get the right size and fit can be a daunting task. Different shoe brands use different sizes (and even then, they may run big or small, causing you to have to go up or down a size).
If you are not shopping in store with the help of an associate, most online shoe stores provide the guidance of a shoe size conversion chart.
For the most part, when converting from European shoe size to US shoe size, it is pretty easy. An easy way of looking at it is to simply look at the second number of European shoe size and that will be your US shoe size. For example, a 37 is a size 7. This isn't an exact science however as there are half-sizes to keep in mind but it's a good place to start.