How much of Warsaw was destroyed during World War II?

During World War II, Warsaw suffered catastrophic destruction. By the time Soviet forces reached the city in 1945, they found it in a state of "almost total devastation".1

The destruction was the result of several key events:
* 1939 Siege: The initial Nazi siege of Warsaw caused significant damage and loss of life.12
* Systematic Plunder: Throughout the occupation, the Nazis systematically plundered the city’s cultural treasures and deported its inhabitants to labor and concentration camps.12
* Warsaw Ghetto Uprising (1943): The Nazi response to the uprising included the destruction of the Great Synagogue and the devastation of the Jewish quarter.12
* Warsaw Uprising (1944): Following the failure of the Polish Home Army's insurrection, German forces systematically deported the remaining population and razed the city itself.3

Between 1939 and 1944, an estimated 600,000 to 800,000 residents of Warsaw died. Following the war, the city required a massive effort to be rebuilt from the ruins.12