Klára Dán is born in Budapest, Austria-Hungary (later Hungary). Her family background would have provided a relatively comfortable and intellectually stimulating environment.

Attended local schools in Budapest. Her innate intelligence and aptitude for learning likely became apparent early on, possibly with an interest in mathematics and problem-solving, though documented details are sparse.

Grew up in Budapest, a city buzzing with intellectual activity in the interwar period. While there's no specific record of her attending specific salons, this context likely influenced her intellectual development.

Klára gained exceptional skills in shorthand, a highly valued ability at the time, which likely played a role in her later professional life, potentially contributing to her accuracy and efficiency.