Dansko and Sanita shoes are sized using the European Shoe Size methods. To help you understand these sizes in US shoe size terms, we put together this conversion chart.

European 34 35 35.5 36 37 37.5 38 38.5 39 39.5 40 41 42
American 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5

However, most sellers actually use a sizing chart closer to this.

European 35 36 37 38 39 40 41 42
American 4.5-5 5.5-6 6.5-7 7.5-8 8.5-9 9.5-10 10.5-11 11.5-12

 If you have never tried on Dansko or Sanita shoes, we recommend you go to a store that sells them and actually try a pair on. Then come back and pick out the style you like.