Kaufeldt is the all-time top scorer of AIK, with 122 goals in 170 matches; he won the national football title with the club in 1923 and 1932 and a bandy title in 1931. Internationally, between 1921 and 1931 he played football (33 matches, 23 goals), ice hockey (6 matches, 0 goals) and bandy (2 matches). In retirement he worked as a coach with AIK, Hammarby, Djurgården and Örebro SK. Later he developed an unexplained pain in his legs, which led to his death at the age 53.[3]