Offstage, Sudha is like any other career woman, balancing between her professional and personal lives. She is ably supported by her husband Ragunathan and the children Kaushik and Maalavika. Sudha is a very down-to-earth person with no airs despite her fame and is easily approachable.
She is very friendly, optimistic, outgoing and has a very good sense of humor. When she is not on tours, Sudha spends time helping her children with their school work and playing word games with them just like anyother working mom. She finds time to watch TV with the family, entertain the numerous visitors who ring her door bell and occasionally goes for a movie with the children. Whenever she gets a little break from her otherwise hectic schedule the foursome take small trips with friends.
Sudha has many talents besides her music and has won prizes throughout her school and college days for debates, writing and drawing. She is very fluent in several Indian languages including Hindi, Telugu and Kannada besides Tamil.

Sudha launched a Trust for social welfare activities on July 20th,1999.The Trust has been named the
"SAMUDHAAYA FOUNDATION" for which Sudha is the Managing Trustee.The Trust covers a wide spectrum of activities ranging from Music to Education,so also many charitable causes.As the first project Samudhaaya Foundation collected Rs.5 lakhs and donated it to the KARGIL DEFENCE PERSONNEL RELIEF FUND.This target was achieved through a concert of Sudha Ragunathan on the inaugural day.

As the second project,Samudhaaya Foundation donated a sum of Rs.1 lakh to the cyclone stricken victims of Orissa in December 1999.

As the third project, samudhaaya Foundation donated a sum of Rs. 3.5 Lkhs towards the Gujarat Earthquake Relief Fund in February, 2001.

In the domain of music "SAMUDHAAYA" has conducted a "FACE to FACE" programme with veterans in music. Also "ISAI ARUVI" was an offshoot of "SAMUDHAAYA" where ragas were explained to educate the lay listener.