Original: The act increased the area of Berlin 13-fold from 66 km² (25.5 mi²) to 883 km² (341 mi²) and the population doubled from approximately 1.9 million to near 4 million, with almost 1.2 million of these new inhabitants coming from the 7 surrounding towns alone.
Simplified: Its area went from  to  and the population doubled from approximately 1.9 million to near 4 million, with almost 1.2 million of these new inhabitants coming from the 7 surrounding towns alone.