Kärt was born in 1721. Kärt's father was Andres and her mother was Epp. Her paternal grandparents were Toots and Ann; her maternal grandparents were Peedu and Kärt. She had five brothers named Jüri, Juhan, Jaak, Tõnn and Mats. She had a half-brother and two half-sisters, named Mihkel, Liis and Margret. She died at the age of 36 in 1757.