Randhir Kapoor made his acting and directorial debut with Kal Aaj Aur Kal (1971) which also starred his wife, father and grandfather. The film was produced under the R.K banner and was an average success.. After his debut, he scored with two successful movies, the first with Jaya Bachchan in the film Jawani Diwani (1972) which also included the hit song Jaane Jaan. This movie was one of the biggest hits of that year and was applauded because of the music and performances. The other success, also released in the same year, was Raampur Ka Lakshman[3], with Shatrughan Sinha and Rekha, and directed by Manmohan Desai, with music by the legendary R.D. Burman. In 1975 he directed and starred alongside his father once again in Dharam Karam which was a failure at the box office.

He went on to appear in other multi-starrer hit films: Chacha Bhatija (1977), Kasme Vaade (1978) (he earned a Filmfare nomination as Best Supporting Actor) and Pukar (1983). However except for Jawani Diwani, which was a success to a major extent because its music by the extremely talented Rahul Dev Burman, Randhir Kapoor never gave a single successful movie in which he was the leading man. All his other hits were with other major stars, and in which Randhir Kapoor himself was the secondary lead.

After the 1984 film Khazana he quit acting and took to producing and directing. In 1991 he directed the film Henna which was at first directed by his father but he died during the production of the film and Randhir completed the film for him. He earned a Filmfare nomination as Best Director. In 1996 he was the producer of PremGranth which was the directorial debut of his younger brother Rajiv and in 1999 he was the producer of Aa Ab Laut Chalen which was the directorial debut of Rishi.

On 13 May, 2007 he made an appearance on the television chat show Koffee with Karan where his brothers and sister Rima as well as his sister-in-law Neetu Singh appeared. On the show, it was mentioned how Randhir had been Neetu's first leading man in the film Rikshawala (1972), and they laughed about how the film hadn't done well.

She worked with her then future husband Randhir Kapoor on his first directorial debut "Kal Aaj Aur Kal" which was notable as the first and only film to bring together 3 generations of Kapoor family members.