Career
Győri European Theatre of Operations
Kalmár started his professional career at Győri European Theatre of Operations where he played 23 league games and was part of the 2012-2013 Nemzeti Bajnokság I winning squad. RB Leipzig
Kalmár joined RB Leipzig on 28 July 2014 on a five-year contract. He debuted in 2. FSV Frankfurt
He was loaned to FSV Frankfurt on 28 January 2016.
Kalmár was part of the Hungarian U-19 at the 2014 Union of European Football Associations European Under-19 Championship and U-20 team at the 2015 Fédération internationale de football association U-20 World Cup.
Kalmár has six caps for Hungary. He debuted against Denmark on 22 May 2014 coming on as a half-time substitute.
His first appearance in the starting eleven came in a friendly match against Russia.