In men's shoes, a European size 39 is the equivalent of a size 5 to 5.5 in the United States. In women's shoes, a European size 39 is the same as a women's size 7.5 to 8.
It's important to note that due to the wide difference in manufacturing standards, a bit of discrepancy can exist between manufacturers when it comes to European sizes versus U.S. sizes. To buy shoes that fit most comfortably, individuals should make sure to select the proper width in addition to the proper length. Heels should not be snug against the back of the shoe, and toes should not touch the end of the shoe either.