Kalyani started acting as a child in a number of television series and rose to fame with her first major role in Alli Thandha Vaanam, a film of the Tamil cinema. She later starred in many films as a child artist and went on to appear as Raadhika Sarathkumar's Teenage Daughter Surya in Sun TV's Annamalai.She has also acted in a Hollywood film. She changed her name as Poornitha and acted in Marandhen Meimarandhen which was her first full-fledged heroine, then Prathi Gnayiru 9.30 to 10.00 and went on to act in Malayalam and Telugu films as well. She was also the anchor of Vijay TV Super Mom. After entering Vijay TV, she has changed her name to her original name Kalyani. She was on a television series called Pirivom Santhipom, Pirivom Santhipom Season 2 and Thayumanavan . Currently she is on a television series called Aandal Azhagar . She was the anchor of Super Singer Junior and Beach Girls in Raj TV. She married a doctor, Rohit based in Bombay on 12 December 2013.