Peter Gradin played with two clubs during his career – MoDo AIK from 1976-78 and with AIK Solna from 1978-92. Gradin won Swedish titles in 1982 and 1984 with AIK Solna and was selected to the Swedish championships all-star team in 1984. Internationally, Gradin played at two major international tournaments. He won Olympic bronze in 1984 and was sixth at the 1985 World Championships. After finishing his playing career, Gradin worked as an ice hockey coach with AIK Solna, IF Sundsvall Hockey and AIK Härnösand.