[2] Chauhan earned a Master of Science in Geology from a government college at Dharamshala affiliated to Himachal Pradesh University.

His songs "Khoon Chala" from Rang De Basanti and "Tum Se Hi" from Jab We Met are regarded as his most notable.

Chauhan made his debut with Shandilya's composition of the song "Pehli Nazar Me Dari Thi" from the 2002 film Road.

[citation needed] The next year, he sang for the films Main Madhuri Dixit Banana Chahati Hoon and Kyun, but didn't get any recognition.

Rahman, who had noticed Chauhan at the award win for Silk Route, called him to sing "Khoon Chala" for the film Rang De Basanti.

The song proved to be a breakthrough for him, and in 2007, he followed this up with his first major hit song in the Pritam-composed romantic ballad "Tum Se Hi" for the film Jab We Met, penned by Irshad Kamil; both Pritam and writer-director Imtiaz Ali wanted Chauhan to lend his voice for this romantic track.

He reunited with Pritam for Kismat Konnection where he performed "Kahi na Lage Man (Is This Love)" along with Shreya Ghoshal.

2009 was the most successful year in Chauhan's career, as of the 8 songs he recorded, 4 of them — "Masakali" from Delhi-6, "Yeh Dooriyan" from Love Aaj Kal, "Pehli Baar Mohabbat" from Kaminey and "Tune Jo Na Kaha" from New York — were huge chartbusters, establishing him as an audience favourite among the younger generation.

Chauhan had his biggest rise to national prominence in 2011 as he attracted mainstream attention for his contribution to the soundtrack of Rockstar, which reunited him with Ali and Rahman after almost half-a-decade; the 9 songs he recorded for the film as the voice of the protagonist Jordan played by Ranbir Kapoor were all massive chartbusters at the time of release, and continue to be treated as cult songs till date.

In 2019 Chauhan performed at Kargil Vijay Diwas, he sung "Khoon Chala" his song from Rang De Basanti, as a tribute to the brave Indian Soldiers.

[18] Mohit is an active participant in the not-for-profit public limited companies National Skill Development Corporation (NSDC), which encourages young people to follow beneficial vocational training initiatives.

[19][20][21][22] Chauhan regularly feeds 250+ stray dogs in Delhi which started at the time of Lockdown in India due to COVID-19 pandemic.