Kammala jumla mai zuwa: Kalnietis ya fara a matsayin mai tsaron gidan wasan kwallon kwando na Lithuania wanda ya gama na bakwai a gasar zakarun duniya ta FIBA ta 2006. Yana da matsakaicin maki 6.0 da tallafi 2.8. Ya kuma taka leda a Gasar Cin Kofin Duniya ta FIBA ta 2010, a matsayin mai farawa, kuma ya lashe lambar tagulla. Ya buga wasanni bakwai don Lithuania a gasar
Wasannin Olympics na 2012, matsakaicin maki 5.5. Ya jagoranci tawagar 'yan wasan Lithuania a lokacin EuroBasket 2013 zuwa lambobin azurfa, yana da maki 12.1 da kuma taimakawa 5 a kowane wasa (jagorancin taimakawa gasar). Ya rasa gasar cin kofin kwallon kwando ta duniya ta FIBA ta 2014, saboda lalacewar ƙashin ƙugu, amma ya koma ƙungiyar ƙasa a EuroBasket 2015. A lokacin wannan gasar, a ranar 7 ga Satumba, a kan ƙungiyar 'yan wasan Belgium, ya sami tarihin EuroBasket na kowane lokaci na wasa guda na taimako 13, kawai don a daidaita shi kwanaki daga baya don wannan rikodin ta Miloš Teodosić. Kungiyar 'yan wasan Lithuania ta lashe lambar yabo ta azurfa ta biyu a jere a shekarar 2015, kuma Kalnietis ya sake zama jagora a gasar, tare da matsakaicin taimako 7.8 a kowane wasa. Bugu da ƙari, ya ba da tallafi 70 gaba ɗaya, wanda shine tarihin tallafi na kowane lokaci don EuroBasket ɗaya. Kalnietis kuma ya kasance jagora na taimakawa a EuroBasket 2017, yana da matsakaicin 7.2 a kowane wasa.