Manasvi Mamgai was born in Delhi, but points out that her roots are from Uttarakhand . She did her schooling in Chandigarh. While at school she excelled in dancing and skating. By the age of 14 she won multiple state awards in dancing, including Dancer of the Year trophy awarded by the Chandigarh Institute of Performing Arts and the best dancer award by the Chandigarh Art Theatre. She also has many medals in skating, the best being the running trophy in V.L. Shah memorial All-India Open Skating championships. She was also the assistant editor of her school magazine. And she went on to win Elite Model Look India 2006 The same year she also debuted at the Wills Lifestyle India Fashion Week, where she was chosen as one of 16 “New Faces Going Places”. Since then she has walked the ramp for many top Indian designers, shot campaigns for Fair and Lovely, Tarun Tahiliani, Manis
Manasvi won the Miss Tourism International held in Malaysia on 31 December 2008, Manasvi also won the Miss Popular subtitle in the contest by voting. On April 30, 2010 she was crowned Femina Miss India, winning five subtitles including Miss Golden Heart, Miss Catwalk, Miss Natural Beauty in the pageant. Manasvi represented India at the Miss World 2010, she was selected as one of the 8 contestants to open the Miss World Finale that year in the Dances of the world, the very first time India graced the Dances of the World stage.
Manasvi Mamgai performed at the Inauguration Concert of then US President-elect Donald Trump in 2016.She has been vocal about her support for conservative pro-Trump activist Shalabh Kumar, who has publicly claimed Manasvi to be his daughter. Till date she has not refuted any of those statements, however, she is his goddaughter. Manasvi is also an ambassador for AVG Advanced Technologies, a company Shalabh Kumar is CEO of.