Then she studied voice at the same academy and at the Royal Academy of Music in London, where she graduated receiving the DipRAM, the highest award for performance. After a very successful debut as Pamina in Mozart's The Magic Flute (Die Zauberflöte) she joined the Latvian National Opera as a soloist, where she performed parts such as Mimi in Puccini's La Bohème and Gilda in Rigoletto and took on title roles in Lucia di Lammermoor and Handel's Alcina.
In London she made quite an impression as La Contessa in Mozart's Le Nozze di Figaro, with the orchestra conducted by Sir Colin Davis.
Inga Kalna has twice been awarded the Latvian Theatre Prize for excellent performances, and is one of the few artists who has been given the Great Music Award of Latvia three times in tribute to her outstanding achievements. In Great Britain she has received the Goldberg Operatic Prize and the Bruce Miller Memorial Trust Award. In Germany, she was awarded the Wilhelm-Oberdörfer-Preis.
In 1999 Inga Kalna became a soloist at the International Opera Studio of the Hamburgische Staatsoper. The audience came to appreciate her convincing performances as Barena in Janacek's Jenufa, as La Dama in Macbeth as well as Olympia, Antonia and Stella in Offenbach's Les Contes d'Hoffmann.
During the following season she was admired as Adina in L'Elisir d'Amore, Xenia in Boris Godunov, Gilda in Rigoletto, Lucia in Donizetti's Lucia di Lammermoor and as a breathtaking Violetta in La Traviata.
Critics have been unanimous in their praise of her and this reputation precedes her. During the season of 2003/04 she gave a guest performance as Violetta Valéry at the National Reis Opera of the Netherlands where the audience awarded her a standing ovation. In addition, she made an appearance in a new production of Händel's Samson at the Dutch Opera in Amsterdam.
In 2004/2005 season she appeared at the Vlaamse Opera in Antwerpen/Gent as Armida in Händel's Rinaldo as well as at the Innsbruck Festival Weeks as Dorotea in Conti's Don Chisciotte, Réne Jacobs conducting. Furthermore, in 2005, she left her visitor's card in the premières of Rossini's Il Turco in Italia and Hindemith's Mathis der Maler and in other principal parts at the Hamburg Opera.
In addition to her comprehensive opera repertoire, Inga Kalna has fascinated her audiences with Bach's Passion music and requiems and masses by Beethoven, Gounod, Mozart, Brahms, Verdi and Fauré. She also has sung Vier Letzte Lieder (Four Last Songs) by Richard Strauss and Mahler's 4th symphony. These productions were made under conductors such as Sir Colin Davis, Réne Jacobs, Alfred Eschwe, Ingo Metzmacher, Stefan Soltesz, Gerd Albrecht and Marc Soustrot.
In 2009 she performed Alcina at La Scala, Milan.