Agerwal was born at Hyderabad and brought up in Bengaluru . Her schooling was at Vidyashilp Academy and Vidya Niketan School . She holds a graduation in Business Management from Christ University, Bengaluru. She is well trained in Ballet, Kathak and Belly dance. She was a finalist in Miss Diva - 2014.^[5]

In 2016, director Sabbir Khan confirmed that Agarwal was signed as the lead in his film Munna Michael, alongside Tiger Shroff. She was chosen from 300 candidates. About her acting passion she said, "I always wanted to be an actress. Every time I saw Aishwarya Rai on a hoarding I'd tell myself that my face would be up there too one day." Nidhhi was also asked to sign a no-dating clause till the completion of the film.^[6][7]

• Honored with life membership of International Film And Television Club of Asian Academy of Film & Television