Claflin was a talented soccer player as a teenager, but after suffering two broken ankles, decided to pursue acting instead. His father, Mark, is a finance officer and his mother, Sue, is a classroom assistant. He has two older brothers, Benjamin and Daniel, and a younger brother, Joseph, who is also an actor. He graduated from LAMDA drama school in 2010. He was seen in the 2011 soccer film,United. Claflin is best known for his roles in Pirates of the Caribbean: On Stranger Tides, United and Snow White and the Huntsman. He was also in the short BBC TV series White Heat, and stared in a new film in 2014. Claflin is adored by many fangirls, their fanbase classifed as 'Claflin Cadets'.