The event will take place on April 13-15 and April 20-22, and feature the same acts over both weekends.
Headliners at Coachella in 2011 included Kings of Leon, The Black Keys , Kanye West and Duran Duran.
Tickets went on sale in January and sold out in six days, prompting promoters (Goldenvoice) to expand the 2012 edition.
"We know many of you were unable to attend this year's festival because passes sold out much sooner than anticipated," promoters said in a statement. "We were truly surprised by the overwhelming response and remain honored by your passion and enthusiasm."
Daily capacity at the Empire Polo Grounds in Indio -- where the event is held -- is about 90,000 people.
The festival was first held in 1999. Headliners that year including Beck, Tool and Rage Against the Machine.
The event has been held every year since then and expanded to two days in 2002 and three days in 2007.