Kärt was born in 1760. Kärt's father is Peep and her mother is Anu. Her paternal grandfather was Andres and her paternal grandmother is Mai; her maternal grandparents were Jaan and Kärt. She had five brothers and two sisters, named Mats, Hindrik, Toomas, Jüri, Villem, Ann and Liis. She died at the age of 58 in 1818.