What Is the U.S. Equivalent of a Size 39 Shoe?

The different measurement increments used in the two systems prevent a direct conversion of the European size to the U.S. size.

Shoe sizes in both Europe and the United States derive from the shoemaker's tool known as a last, which resembles a human foot. The differences between the sizes originate with the different measurement scales used by English and continental European shoemakers. U.S. sizes are modified from the English system.