Chramosta grew up in FK Mladá Boleslav. His debut in the Czech First League was a 0–0 home draw against Viktoria Žižkov on 5 April 2009. In his first season Chramosta scored five goals in nine matches and was eventually voted "Revelation of the Year" at the Golden Ball awards.[1] He became a club legend after he played nine seasons for the club between 2009 and 2018, and with 49 goals became the best scorer in the club's first league history.[2]
In 2018, he transferred to FK Jablonec and also became one of the top scorers in this club's history with 37 goals (as of June 2024).[3]
Chramosta was considered for the senior national team in 2012, but due to a serious knee injury and subsequent recovery, which slowed down his career, it did not happen.[7]