[3] Kalra was born in Windsor and Maidenhead,[1] Berkshire, England, to a British-born father and Indian-born mother of Punjabi Hindu descent.
[5][6] He was in his first year at the Royal Welsh College of Music & Drama in Cardiff in 2016 when he left after being cast in his first role.
[9] He was cast as Javed Khan in Blinded by the Light, about a British-Pakistani teen inspired by Bruce Springsteen in 1987, after singing "Born to Run" in the audition.
[11] He stars as Peter in the science fiction film Voyagers, along with Tye Sheridan, Fionn Whitehead, Colin Farrell and Lily-Rose Depp.
[13] In 2023, he signed on to co-star with Shruti Haasan in the cross-cultural romantic comedy film titled "Chennai Story," which is directed by Philip John.