UK 3 = US 5.5-6 (closer to 6) Bought these from a vintage shop in England over 10 years ago now. Only worn them a handful of times because Dr. Martens are notoriously hard to break in. Unfortunately, I am in my 30s and no longer willing to go through the pain (I have wider calves and ankles so they cut into the back of my ankle when I walk). They are still so cool. Hoping they find a new home.